Practice Test

Q1) Scapula is a large triangular flat bone situated in the dorsal part of the thorax between the
Show Answer

Q2) Human skeletal system consists of
Show Answer

Q3) The store house of calcium ions in the muscle fibre is Show Answer

Q4) During skeletal muscle contraction following events occur-I. I-band shortens II. A-band shortens
III. H-zone shortens IV. Sarcomere contract
V. ATP changes to ADP and Pi
Choose the option with incorrect events Show Answer

Q5) Aerobic muscles called …A… and anaerobic muscles are called …B… . Here A and B refers to Show Answer

Q6) Pick out the correct match. Show Answer

Q7) Chemical ions responsible for muscle contraction are Show Answer

Q8) In the resting state of muscles the troponin Show Answer

Q9) Joints are classified into three major types. They are
I. Fibrous joint II. Hinge joint
III. Cartilaginous joint IV. Pivot joint
V. Synovial joint
Select the option containing correct articles Show Answer

Q10) …………acts as a shock absorber to cushion when tibia
And femur came together Show Answer

Q11) Pelvic girdle consists of two coxal bones and each coxal bone consists
I. ilium II. Incus
III. ischium IV. pubis
Choose the correct option containing all correct bones Show Answer

Q12) Ligament connects Show Answer

Q13) In the centre of each I-band there is an elastic fibre called Show Answer

Q14) Fibrous joints in humans Show Answer

Q15) Intercalated disc is found in Show Answer

Q16) Knee joint is Show Answer

Q17) The set of ions necessary for muscle contraction is Show Answer

Q18) The longest bone of the human body is Show Answer

Q19) Total number of bones found in right upper limb is Show Answer

Q20) Muscle fatigue is due to Show Answer

Q21) Joints are the point of contact between
I. bones II. Cartilages and bones
III. bones and muscles IV. cartilage and muscles
Select the containing correct articles Show Answer

Q22) Which of the following statements regarding locomotion and movements is wrong? Show Answer

Q23) Which of the following statement Is/ are correct / incorrect?
I. A-bands of the muscle is dark and contain myosin.
II. I-bands are the light bands and contain actin
III. During muscle contraction, the A-band contracts.
IV. The part between the two Z-lines is called as sarcomere.
V. The central part of thin filament, not overlapped by thick filament is called H-zone. Show Answer

Q24) Bones become fragile in Show Answer

Q25) Where the saddle joints are presents in humans? Show Answer

Q26) Striped muscles are characterized by Show Answer

Q27) Human cranium has………..bones. Show Answer

Q28) Which of the following are the properties of cardiac muscles?
I. They are the muscles of the heart
II. They are non-striated
III. They are involuntary in their functions
IV. They are made up of fascicles
Select the correct option Show Answer

Q29) Both proteins, actin and myosin are arranged in a rod-like structure in the muscles Show Answer

Q30) Lactic acid in muscles is formed due to Show Answer

Q31) Identify the correct statements
I. Acetylcholine is released when the neural signal reaches to the motor end plate
II. Muscle contraction is initiated by signals sent by CNS via a sensory neuron
III. During muscle contraction, isotropic bands get elongated
IV. Repeated activation of the muscles can lead to lactic acid accumulation in them
The option with correct choices is Show Answer

Q32) Number of bones in skull is Show Answer

Q33) Fascicles are held together by the structure Show Answer

Q34) Our vertebral column is formed by the Show Answer

Q35) The sensation of fatigue in the muscles after prolonged strenuous physical work, is caused by Show Answer

Q36) Visceral muscles are also called


Show Answer

Q37) Movement of our limbs, jaws, tongue, etc., requires
Show Answer

Q38) Cross arms of the myosin monomer consists of Show Answer

Q39) Tick the wrong option regarding human beings Show Answer

Q40) Fused vertebrae in human are
I. Sacral
II. Coccygeal
III. Thoracic
IV. Cervical
V. Lumber Show Answer

Q41) Which of the following statements are false regarding the muscle structure?
I. In the centre of each I-band is an elastic fibre (Z-line) which bisects it
II. Thin filament are firmly attached to the Z-line
III. M-line is a fibrous membrane in the middle of A-band
IV. A sarcomere comprises one full-A band and two half I-bands Show Answer

Q42) Which of the following lubricates ligament or tendons and is an important constituent of synovial fluid of
bones? Show Answer

Q43) For how long, contraction of the muscles continues in sliding filament theory? Show Answer

Q44) Which statement is correct for muscle contraction? Show Answer

Q45) The membrane sarcolemma is found over Show Answer

Q46) The lactic acid generated during muscle contraction is converted to glycogen in Show Answer

Q47) Which of the following is important for muscle contraction and nerve impulse transmission? Show Answer

Q48) Which of the following statements is true with reference to the structure of a muscle fibre?
Show Answer

Q49) Standing on tip toe is an example of Show Answer

Q50) Which of the below given bones divide olfactory capsules in rebbit into left and right halves?
I. Nasals
II. Premaxillae
III. Maxillae
IV. Mesethmoid Show Answer

Q51) The muscle band that remains unchanged during contraction and relaxation of the skeletal muscle is Show Answer

Q52) Each actin (thin filament) of is made up of Show Answer

Q53) Choose the correct statements Show Answer

Q54) Select the correct statement with reference to muscle structure
I. Each myosin is a polymerized protein
II. Many meromyosin constitutes one thick filament (myosin)
III. Each meromyosin’s tail is called heavy meromyosin (HMM) and head is called light meromyosin
(LMM)
IV. The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin
Choose the option with correct statements Show Answer

Q55) The region at the ends of the A-band of two adjoining sarcomeres is called Show Answer

Q56) The region between two successive Z-lines in a myofibril is
Show Answer

Q57) Choose the correct statements Show Answer

Q58) Macrophages and leucocytes in blood exhibits Show Answer

Q59) A cricket player is fast chasing a ball in the field. Which one of the following groups of bones are directly
contributing in this movement? Show Answer

Q60) Pelvic girdle of rabbit consists of Show Answer

Q61) Ilium, ischium, pubis are the Show Answer

Q62) Which of the following pairs is correcrly matched? Show Answer

Q63) Choose the correct properties of muscle fibres
I. Muscle fibre is lined by the plasma membrane called sarcolemma
II. Cytoplasm of the muscle fibre is called protoplasm
III. Sarcolemma of the muscle fibre encloses the sarcoplasm
IV. Muscle fibre is syncitium
Select the correct option Show Answer

Q64) Decreased level of oestrogen is human body leads to
Show Answer

Q65) Sarcomere is a Show Answer

Q66) I-bands of myofibrils are bisected by Show Answer

Q67) In which of the following, growth is possible through increase in volume? Show Answer

Q68) First vertebrae in human is called
Show Answer

Q69) Consider the following statements.
I. In man, vertebral column has 33 bones organized as 28 bones.
II. Pelvic girdle is made up of two fused bones only.
III. Osteoporosis is characterized by micro-architectural deterioration of the bone. Show Answer

Q70) Bones of the limbs along with their girdles constitutes the Show Answer

Q71) Hydra can use its tentacles for Show Answer

Q72) Which one of the following is wrongly matched? Show Answer

Q73) Hinge joint is present between Show Answer

Q74) In the body, the membrane surrounding the bone is known as Show Answer

Q75) Which one is wrongly matched? Show Answer

Q76) The joint of femur, with pelvic girdle is
Show Answer

Q77) In which of the following condition, progressive degeneration of skeletal muscles happens? Show Answer

Q78) Gout happens due to accumulation of is joints
Show Answer

Q79) Number of tarsals, metatarsals and phalanges in human skeleton is Show Answer

Q80) Identify the correctly labeled diagram Show Answer

Q81) In the thin filament of skeletal muscle fibre, a small globular protein that masks the active sites on the F-actin L, is
Show Answer

Q82) Haversian canal is found in the bone of Show Answer

Q83) Identify the synovial joints among the given articles
I. Ball and socket
II. Hinge joint
III. Pivot joints
IV. Sutures of skull
V. Vertebral joints
Select the option containing correct articles Show Answer

Q84) The number of cervical vertebrae present in giraffe is Show Answer

Q85) Each myofibrils of muscles contains Show Answer

Q86) Functional unit of skeletal muscle is called Show Answer

Q87) In rabbit, end of a long bone is connected to another by Show Answer

Q88) Actin and myosin filaments of muscles are also called Show Answer

Q89) A sarcomere in the myofibrils of muscle is found in between Show Answer

Q90) Identify the muscle which represents the following characteristics and choose the correct option
accordingly
I. Transportation of food through the digestive tract
II. Transportation of gametes through the genital tract Show Answer

Q91) Which ion binds with troponin during muscle contraction? Show Answer

Q92) Muscle contraction is initiated by the signal sent by Show Answer

Q93) Haversian canals are found in Show Answer

Q94) Flat bone on the ventral midline of thorax is called Show Answer

Q95) Which muscle component is the smallest among the given options? Show Answer

Q96) Choose the wrongly matched option Show Answer

Q97) Cartilage has slightly pliable matrix due to Show Answer

Q98) In humans, true ribs connects to …A… and …B… dorsally and ventealiy respectively Show Answer

Q99) Ciliary movement occurs in most of our internal tubular organs which are lined by …A epithelium. The
coordinated movement of cilia in the …B… help us in removing dust particles. Passage of ova through
female reproductive tract is facilitated by the …C… movement
Identify A, B and C to complete the given NCERT statement Show Answer

Q100) Select the correct statements with reference to muscles
I. Cardiac muscles are non-striated
II. All non-striated muscles are involuntary
III. All movements leads to locomotion
IV. Micro filaments all involved in amoeboid movements
Correct option with all wrong statements is- Show Answer

Q101) Elbow joint is an example of Show Answer

Q102) Motor unit is a Show Answer

Q103) Based on their location in humans body or animals types of muscles are
I. skeletal II. visceral
III. cardiac IV. non-visceral
The correct option is Show Answer

Q104) In which of the following muscle component actin binding sites all present? Show Answer

Q105) In a …A… state, the edge of thin filaments on either side of thick filaments …B… overlap the free ends of
...C… filaments leaving the central part of thick filaments. This central part of thick filament, not
overlapped by thin filaments is called …D… zone.
Choose the correct options to fill the gaps A, B, C and D, so as to complete the given NCERT statement Show Answer

Q106) Muscle pump is Show Answer

Q107) Which of the following statements are true for ciliary movements? Show Answer

Q108) What is the approximate number of muscle present in human body?
Show Answer

Q109) How many pairs of ribs are present in human skeleton? Show Answer

Q110) Monomer of the myosin (thick) filament is Show Answer

Q111) Head of myosin monomer consists of
I. actin binding sites
II. ATP binding sites
III. ADP binding sites
IV. AMP binding sites
Select the correct options Show Answer

Q112) The joint of radio-ulna with the upper arm is Show Answer

Q113) Suturus of human skull is Show Answer

Q114) Skeletal system consist of a
Show Answer

Q115) Contractile fibrils of the muscles are called Show Answer

Q116) Where the troponin is found during muscle contraction? Show Answer

Q117) Which one is odd pair? Show Answer

Q118) Actin binding sites are located on Show Answer

Q119) Vestigial tail in humans is
Show Answer

Q120) Sigmoid notch is present in Show Answer

Q121) Haversian canals are present in Show Answer

Q122) Which is common to kidney and skeleton in mammals? Show Answer

Q123) Immediate energy source for muscle contraction is Show Answer

Q124) Arthritis is
Show Answer

Q125) Humerus fits into glenoid cavity is example of Show Answer

Q126) Ribs attached to sternum are Show Answer

Q127) Locomotion requires a perfect coordinated activity of Show Answer

Q128) Largest muscle in the human body is
Show Answer

Q129) During the muscle contraction, which zone decreases? Show Answer

Q130) Main types of movement exhibited by the cells of human body are
I. Amoeboid II. Ciliary
III. Muscular IV. Flagellar
Option containing the correct answer is Show Answer

Q131) The gliding joints are important for gliding movements. One example of such a joint is between the Show Answer

Q132) Which of the following features differentiate bone from cartilage? Show Answer

Q133) The number of occipital condyles in man is/are Show Answer

Q134) Action potential in sarcolemma of muscles causes the release of Show Answer

Q135) Muscle contains a red coloured oxygen containing pigment called Show Answer

Q136) Breast bone is also called
Show Answer

Q137) Which one of the following item gives its correct total number? Show Answer

Q138) Acetabulum is Show Answer

Q139) Contraction of the muscles takes place by the sliding of Show Answer

Q140) Neural canal is Show Answer

Q141) Pseudopodia in Protozoa is formed by the streaming of Show Answer

Q142) Cartilaginous joints in humans
Show Answer

Q143) What is the Location of troponin in the process of muscle contraction? Show Answer

Q144) Fascicles in human/animal are the Show Answer

Q145) Which is not the function of endoskeleton? Show Answer

Q146) The joint found in head of upper arm and pectoral girdle is
Show Answer

Q147) Select the wrong set of statements with respect to muscles
I. Z-line is present in the centre of the light band
II. Thin filaments are firmly attached to the M-line
III. The central part of the thick filaments, not overlapped by thin filaments is called Z-band
IV. Light band contains only thin filaments
Correct option with all wrong statements is Show Answer

Q148) Rib cage is formed by Show Answer

Q149) The term ’innominate’ is related with Show Answer

Q150) F-actin is a polymer of Show Answer

Q151) For muscle contraction, in myofibrils the formation of a protein is essential, such protein was discovered
by Show Answer

Q152) Select the incorrect option about the human skull Show Answer

Q153) The glenoid cavity is associated with
Show Answer

Q154) Hardness of the bones is due to Show Answer

Q155) Ribs that are attached to the thoracic vertebrate and ventrally connected to the sternum with the help of
hyaline cartilage are called Show Answer

Q156) The number of floating ribs in the human body is Show Answer

Q157) Scapula is a triangular bone situated
Show Answer

Q158) Which one of the following is a sesamoid bone? Show Answer

Q159) Mechanism of muscle contraction is best explained by Show Answer

Q160) Choose the correct statement about muscles
Show Answer

Q161) When body part moves towards the median axis the muscle is called Show Answer

Q162) According to the functions the skeletal muscles is/are Show Answer

Q163) Formula of vertebral column of man is Show Answer

Q164) Sliding filament theory was given by Show Answer

Q165) Statement 1: Knee joint is the hinge type of joint.
Statement 2: Femur, patella and fibula are associated with knee joint. Show Answer

Q166) Red fibres are the fibres containing high content of Show Answer

Q167) Streaming of the cytoplasm/cyclosis is seen in Show Answer

Q168) An individual sarcomere of myofibril consists of Show Answer

Q169) Ligament is mainly made up of Show Answer

Q170) A disease associated with joint is humans Show Answer

Q171) Arrange the given steps of muscle contraction in the series of events from first to last
I. Myosin head binds to the exposed active site on action to form a cross bridge
II. The Z-line attached to these actin are also pulled in wards there by causing shortening of sarcomere also called contraction
III. This pulls the attached actin filaments towards the centre of A -band
The correct option is
Show Answer

Q172) Which of the following option shows correct order of some stages of muscle contraction from the beginning to the end of the process? Show Answer

Q173) What will happen if ligaments are cut or broken? Show Answer

Q174) In a vertebrate, which germ layer forms the skeleton muscles? Show Answer

Q175) Muscle is attached to bone by Show Answer

Q176) Which of the following statements about the joints of humans is false? Show Answer

Q177) The contractile protein of skeletal muscle involving ATPase activity as Show Answer

Q178) I. Sarcoplasmic reticulum are abundant
II. Myoglobin content is high
III. Sarcoplasmic reticulum are moderate
IV. Aerobic muscles
V. Depends on anaerobic respiration for energy
VI. Less myoglobin content
Select the option with correct statements for red muscle
Show Answer

Q179) Study the following sentense .
1. The accumulation of pyruvic acid in the muscle causes fatigue
2. ATP is resynthesized in the muscle by the phosphorylation of ADP by a phosphogen.
3. Cori and cori’s cycle occurs in the muscles.
4. The phosphogen in the vertebrate muscle is arginine phosphate.
The correct set of answers for muscle contraction is
Show Answer

Q180) Synovial joints is humans are characterized by Show Answer

Q181) Folding and unfolding of actin and myosin leads to amoeboid movement. This is hypothesized by Show Answer

Q182) The thin filaments of a muscle fiber are made up of Show Answer

Q183) The polysaccharide portion of a proteoglycan present in the matrix of cartilage is known as Show Answer

Q184) Sigmoid notch is formed by Show Answer

Q185) There are seven cervical vertebrae in almost Show Answer

Q186) …A… band contains actin and is called …B…. band, whereas the ….C… band called ….D… band contains myosin
Choose the correct options for A, B and C to complete the given NCERT statement
Show Answer

Q187) Nucleus pulposes is found in Show Answer

Q188) Myofilaments or myofibrils are Show Answer

Q189) Read the statements regarding muscle proteins.
1. Actin is a thin filament and is made up of two F-actins.
2. The complex protein, tropomyosin is distributed at regular inervals of troponin.
3. Myosin is a thick filament which is also a polymerized protein.
4. The globular head of meromyosin consists of light meromyosin (LMM).
Which of the above statements are correct?

Show Answer

Q190) The coxal of the pelvic girdle is formed by the fusion of Show Answer

Q191) In Paraecium, cilia helps in Show Answer

Q192) Which of the following is a part of pectoral girdle? Show Answer

Q193) Osteoporosis is a Show Answer

Q194) Select the correct function of vertebral column in humans Show Answer

Q195) Slow muscle fibres are found in Show Answer

Q196) Neural canal is present in Show Answer

Q197) During muscles contraction Show Answer

Q198) What is the purpose of locomotion performed by animals?
I. Search of food
II. Search of shelter
III. Search of mate
IV. Search of suitable breeding grounds
V. Search of favourable climate conditions
VI. Escaping from enemies/predators
Choose the correct option
Show Answer

Q199) Which of the following statements about the molecular arrangement of actin and myosin are correct?
I. Each actin (thin filament) is made up of 2F (filamentous) actins
II. F-actin is the polymer of G (globular) actin
III. 2F = actins are twisted into a helix
IV. Two strands of tropomyosin (protein) lies in the grooves of F-actin
The correct option is
Show Answer

Q200) End of long bones are covered with Show Answer

Q201) An acromian process is characteristically found in the Show Answer

Q202) Volkmann’s canal occurs in Show Answer

Q203) Matrix of bone is composed of Show Answer

Q204) Which one of the following is a skull bone? Show Answer

Q205) Find out the correct order of number of bones in the parts of skull such as cranial bone, facial bone, hyoid bone and middle ear bone respectively. Show Answer

Q206) Which of the following statements are wrong with reference to muscles?
I. Cardiac fibres are branched with one or more nuclei
II. Smooth muscles are unbranched and cylindrical
III. Striated muscles never performs anaerobic respiration
IV. Cardiae muscles are non-striated
Correct option with all wrong statements is-
Show Answer

Q207) Troponin is a Show Answer

Q208) Which of the following statements is correct? Show Answer

Q209) Middle ear contains three tiny bones
I. Maxillae II. Malleus
III. Incus IV. Stapes
V. Vomer

Show Answer

Q210) Muscular dystrophy in humans is a Show Answer

Q211) Globular head with a short arm and a tail are the two imperfect part of Show Answer

Q212) The clavicle articulates with………of scapula. Show Answer

Q213) Cytoplasmic streaming movement is the characteristic of Show Answer

Q214) Intervertebral disc consists of a shock absorber connective tissue known as Show Answer

Q215) Skeletal muscles are closely associated with the …A… components of the body. They have …B… appearance under the microscope and hence are called …C… muscles
Choose the correct options to fill A, B and C, so as to complete the given NCERT statement
Show Answer

Q216) Inflammation of joints due to accumulation of uric acid crystals is called as Show Answer

Q217) Choose the incorrect statement about the skeletal muscles Show Answer

Q218) I. Myoglobin in very less quantity
II. Appear pale or whitish
III. Mitochondria are very few
IV. Sarcoplasmic reticulum in large quantity
Given characteristics of muscles fibres be long to
Show Answer

Q219) Common among all mammals is Show Answer

Q220) Which muscle band remains unchanged during the contraction and relaxation of the skeletal muscle? Show Answer

Q221) Choose the correct statements for flagellar movements Show Answer

Q222) Select the correct statements
I. During muscle contraction, chemical energy changes into mechanical energy
II. Muscle fatitue occurs due to lactic acid formation
III. The reaction time is different to different muscle
IV. Muscle contraction don’t need ATP
Choose the option with the correct statements
Show Answer

Q223) Human vertebral column is formed by Show Answer

Q224) Action potential in the sarcolemma of muscles is generated by Show Answer

Q225) During muscle contraction, ATP provides energy for Show Answer

Q226) Choose the correct statements regarding muscle proteins
I. Actin is a thin filament and made up of two F-actins
II. The complex protein, tropomyosin is distributed at regular intervals of troponin
III. Myosin is a thick filament which is not a polymerized protein
IV. The globular head of meromyosin consists of Light Meromyosin (LMM)
Option containing correct statement is
Show Answer

Q227) Striated appearance of the myofibrils is due to Show Answer

Q228) Transverse ligament is found in Show Answer

Q229) Neuromuscular junction is a junction between Show Answer

Q230) Each human limb is made of Show Answer

Q231) Pick the true statements with reference to human beings
I. Vertebral column consists of 26 vertebrae
II. Vertebeal is dorsally placed
III. Neural canal invertebra is the passage for spinal cord
IV. Netural canal is ventrally placed
The option with all correct statements is
Show Answer

Q232) Bones of pectoral and pelvic girdle helps in the articulation of Show Answer

Q233) Select the correct statements regarding mechanism of muscle
contraction.
A. It is initiated by a signal sent by CNS via sensory neuron.
B. Neurotransmitter generates action potential in the sarcolemma.
C. Increased Ca++ level leads to the binding of calcium with troponin on
action filaments.
D. Masking of active site for actin is activated.
E. Utilising the energy from ATP hydrolysis to form cross bridge.
Choose the most appropriate answer from the options given below Show Answer

Q234) Which of the following statements are correct regarding skeletal
muscle?
A. Muscle bundles are held together by collagenous connective tissue
layer called fascicle.
B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium
ions.
C. Striated appearance of skeletal muscle fibre is due to distribution
pattern of actin and myosin proteins.
D. M line is considered as functional unit of contraction called
sarcomere.
Choose the most appropriate answer from the options given below: Show Answer

Q235) According to the sliding filament theory Show Answer

Q236) Gout is a type of disorder which leads to : Show Answer

Q237) Given below are two statements : one is labelled as Assertion (A) and
the other is labelled as Reason (R).
Assertion (A):
Osteoporosis is characterised by decreased bone mass and increased
chance of fractures.
Reason (R):
Common cause of osteoporosis is increased levels of estrogen.
In the light of the above statements, choose the most appropriate
answer from the options given below Show Answer

Q238) Which of the following is a correct match for disease and its symptoms? Show Answer

Q239) Which of the following is present between the adjacent bones of the
vertebral column? Show Answer

Q240) Chronic auto immune disorder affecting neuro muscular junction
leading to fatigue, weakening and paralysis of skeletal muscle is called
as: Show Answer

Q241) During muscular contraction which of the following events occur?
(a) 'H' zone disappears
(b) 'A' band widens
(c) 'I' band reduces in width
(d) Myosine hydrolyzes ATP, releasing the ADP and Pi.
(e) Z-lines attached to actins are pulled inwards.
Choose the correct answer from the options given below: Show Answer

Q242) Select the correct option: Show Answer

Q243) Which of the following diseases is an autoimmune disorder ? Show Answer

Q244) Which of the following muscular disorders is inherited? Show Answer

Q245) Which of the following is not an autoimmune disease? Show Answer

Q246) Which of the following hormones can play a significant role in
osteoporosis? Show Answer

Q247) The pivot joint between atlas and axis is a type of Show Answer

Q248) Out of ′X ′ pairs of ribs in humans only ′Y ′ pairs are true ribs. Select the
option that correctly represents values of X and Y and provides their
explanation. Show Answer

Q249) Name the ion responsible for unmasking of active sites for myosin for
cross-bridge activity during muscle contraction. Show Answer

Q250) Osteoporosis, an age-related disease of skeletal system, may occur due
to Show Answer

Q251) Lack of relaxation between successive stimuli in sustained muscle
contraction is known as Show Answer

Q252) Which of the following is not a function of the skeletal system? Show Answer

Q253) Which of the following joints would allow no movements? Show Answer

Q254) Stimulation of a muscle fiber by a motor neuron occurs at Show Answer

Q255) Sliding filament theory can be best explained as Show Answer

Q256) Glenoid cavity articulates Show Answer

Q257) Which one of the following is not a characteristic of plant cells in the phase of elongation?
Show Answer

Q258) Choose the correct statements regarding muscle contraction.
A. A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.
B. The neural signal generates an action potential which causes the release of Ca* into sarcoplasm.
C. Increase in Catt inactivates the actin for breaking cross bridges.
D. Actin binds to the myosin head to form a cross bridge.
E. Shortening of sarcomere takes place, by pulling actin filaments towards the centre of 'A' band.
Choose the correct answer from the options given below:
Show Answer

Q259) Which of the following statements are correct with reference to human endoskeleton?
A. Human skull is monocondylic.
B. The joint between any two adjoining vertebrae is a cartilaginous joint.
C. In human beings, the number of cervical vertebrae is seven.
D. All ribs except the last 2 pairs are bicephalic.
E. The occipital bone of skull is articulated with atlas vertebra.
Choose the correct answer from the options given below:
Show Answer