Practice Test


1) Organisms inhabiting a common environment belong to the same:


2) A biotic community is an assemblage of:


3) A community is not able to survive without:


4) Which of the following term is used for the "study of plant community"?


5) A community that starts the process of succession in a habitat is called:


6) When the vegetation of any region reaches climatic climax, it is:


7) Primary succession starts with:


8) In a biotic community the most important factor for survival of an animal is:


9) The basic unit in ecological studies is population. The sum of all the populations of the same kind of organisms form:


10) Primary succession refers to the development of communities on a:


11) The first plants to appear on a badly burnt forest area will most probably be:


12) The quills of porcupine are an example of:


13) An advantage of being a herbivore that feeds only on one or a few related plant species is:


14) A leaf adapted to a warm dry climate is:


15) An insect survives the cold of winter in a dormant stage by converting its glycogen to:


16) A community with no living green plant is:


17) It is a flock of sheep what is it of lions?


18) In which type of community, the number of species per unit area will be more:


19) Biotic potential is counteracted by:


20) Physical space occupied by an organism (and also its functional role in a community) is called:


21) Animals-Cockroaches scorpions, ants, lizards, mice-which share their abode are called:


22) Generally succession leads to a climax community composed of:


23) The effect of interspecific competition on niches is to make them:


24) The most effective defences of plants against the herbivores are:


25) Many angiosperms and ferns synthesize a molecule similar to ecdysone. It causes the insect herbivore that eat it to:


26) No predator can become proficient at acquiring prey because:


27) Symbiosis is an association between two species in which:


28) Which of the following interaction will not promote co-evolution?


29) The kind of climax community in an area depends mostly on the areas:


30) Most agriculture makes use of plants from:


31) Floating hydrophytes are characterized by:
(a) well developed aerenchyma
(b) absence of stomata on the lower side of leaf
(c) lamina system poorly developed
(d) sunken stomata
(e) root system poorly developed.
The correct characters are:


32) Xerophytes are characterized by:
(a) well developed cuticle
(b)well developed root system
(c)deciduous leaves with assimilatory stems
(d) sunken stomata.
The correct characters are:


33) More of the number of species in a community, more will be:


34) Plant community may be defined as:


35) Intermediate communities between pioneer and climax communities are called as:


36) Occurrence of 200 chlorella in the body wall of Hydra is:


37) When an organism is benefited without affecting the other the relationship is termed:


38) A flowering plant and the animal that pollinates it are examples of:


39) Animals which can tolerate only a narrow range of salinity are said to be:


40) Antagonistic interaction include:


41) The most successful parasite is the one that:


42) Lichens are described as indicators of:


43) In commensalism:


44) Lichens do not normally grow in cities:


45) Primary productivity of ecosystem refers to:


46) The individuals in the uppermost ring pyramid represent the one with:


47) Which of the following is a temporary parasite?


48) An association of a small fish (Fierasfer) inhabiting in the cloaca of sea cucumber is an example of:


49) The animals which preys the other living species is known as:


50) An association of different interrelated populations belonging to different species in common environment which can survive in nature is called:


51) A direct food relation between two species of animals in which one animal kills and feed on another is referred to as:


52) An association of two species where one is benefited and other remains unaffected or unharmed, it is called:


53) An association of two species of organisms where both the partners derive benefit from each other is called:


54) An association between a sea anemone Adamsia, and a hermit crab living in a gastropod shell is:


55) The ecological niche of an organism denotes:


56) The transition zone where two different types of communities meet is called:


57) Mimicry is a device for:


58) The conversion of a lake to a terrestrial community is a form of:


59) An ecological community is an assemblage of:


60) Which of the following is a negative interaction between the population?


61) One of the following relationship is useful to one organism and of no significance to other:


62) Plants growing well in hill crevices are:


63) A community is:


64) Plants which are attached to stones and rocks:


65) What could be the meeting point of biological and ecological hierarchies?


66) The sum of the population of the same king constitutes a:


67) The philosophy behind the existence of a community is:


68) Generally the time taken for a secondary succession to reach climax stage is:


69) Mutualism exists between:


70) Sanke is a:


71) Utricularia is a:


72) In ecological succession from pioneer community to climax community, the biomass:


73) A prey population can weaken the search image of its predator by being:


74) Organisms sharing a common environment belong to same:


75) Female anopheles mosquitoes sucking human blood at intervals are:


76) In a population where competition between individuals is severe, then the distribution is said to be:


77) Information of birth rate, death rate, sex ratio, age distribution of population can be got from:


78) Antelopes are:


79) Most interacting populations are:


80) Desert can be converted to green lands by:


81) The animals, which are capable of digging the earth, are:


82) Which of the following is not a desert animal?


83) Which of the following is biotic factor?


84) The bird enters the mouth of crocodile and feeds on parasitic leeches. The bird gets food and crocodile gets rid of blood sucking leeches. Both the partners can live independently. Such an association is:


85) In minicry, the individual which is benefited is called:


86) When animals feed on other dead animals which had died naturally or had been killed by another animals, this relationship is termed as:


87) A smoother crop is the one which:


88) Which one of the following is protective device?


89) Growth of Tagetes frees the soil of:


90) Relationship between water-fern Azolla and nitrogen-fixing cyanobacterium Anabaena is:


91) Gause's hypothesis/principle is related to:


92) The relationship between one species and another within a community that has evolved through interactions is based upon:


93) The interaction among organisms in a community called as biotic factors influence:


94) Sedge is:


95) Perennial grass stage is represented by:


96) Series of changes on previously barren area is:


97) Crustose lichen is:


98) Secondary succession will not be completed if the bare area is invaded by:


99) Plant succession occurring in a sandy area is:


100) A plant growing on rock is:


101) Scientific study of mimicry was carried out first by:


102) A butterfly of India when resting with folded wings resembles a dead leaf. This mechanism of protection is called:


103) Stick insect (Carausius) mimicry like a thin dry branch and dead leaf or oak leaf butterfly (Kallima) looks like a dead leaf. It is:


104) The mimetic imitates other organism in:


105) Types of aggressive mimicry are:


106) The first scientific account of mimicry was given by:


107) Which one is not an example of concealing protective mimicry?


108) Palatable viceroy butterfly (Limenitis archippus) resembles a distasteful monarch butterfly (Donaus plexippus) for its protection. This is called:


109) When predator (mimic) remains hidden from prey to catch it suddenly as in preying mantis, it shows:


110) When the mimic attracts its prey, it is called:


111) When a palatable female butterfly (e. g. Viceroy butterfly) copies an unpalatable species (Monarch butterfly) the type of adaptation is called:


112) Fungal association of roots of higher plants in mycorrhiza is known as:


113) Hyperparasite is a kind of parasite which:


114) Plants obtaining nourishment from other plants by haustoria are:


115) A successful parasite is the one which:


116) Which of the following statements is correct regarding the two organisms in commensalism?


117) Which is not characteristic of intestinal symbionts?


118) Ecological succession on sand is:


119) Cause of mimicry is:


120) Which of the following insects mimics thin dry branches of the plant on which it lives?


121) The individuals that shows mimicry is called:


122) Heterodon flattens its head, producers frequent hissing and strikes to advertise as if it is dangerous. This is an example of:


123) In conscious mimicry:


124) Which of the following resembles a dry leaf?


125) July 11 is observed as:


126) Which among the following is the primary function of mimicry prevalent in some animals?


127) Succession in an ecosystem is the result of:


128) Mycorrhiza is an example of:


129) Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called:


130) Maximum growth rate occurs in:


131) Lichens are well known combination of an alga and a fungus where fungus has:


132) An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having:


133) A terrestrial animal must be able to:


134) What is keystone speices?


135) The most thoroughly studied of the known bacteriaplant interaction is the:


136) Term used to describe non-dominant species that dictate community structure is:


137) In succession, complexities in structure:


138) The presence of diversity at the junction of territories of two different habitats is known as:


139) Small fish gets stuck near the bottom of a shark and derive its nutrition from it. This kind of association is called as:


140) Praying mantis is a good example of:


141) The formula for exponential population growth is:


142) Find out the correct order of succession levels in xerarch:


143) The concept of chemical evolution is based on:


144) If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:


145) Which one of the following is considered as pioneer community in xerarch?


146) Which one of the following statements is correct for secondary succession?


147) Which of the following is correct:


148) A set of local populations connected by dispersing individuals is called:


149) The increase in number of individuals in a population under given environmental condition is called:


150) The inherent capacity of an organism to reproduce or increase in number is termed biotic potential designated by the symbol:


151) The J-shaped growth form is represented by which of the following exponential equation:


152) The nature of mimic action could be:


153) The S-shaped sigmoid growth form is represented by which of the following equation, which includes an expression for environmental resistance:


154) Commensalism is a type of interaction which is:


155) Which of the following interaction has adverse effect on both the species?


156) One of the following is a functional association not merely living together:


157) Select the mismatch pair:


158) In terrestrial communities, which of the following are dominants?


159) The species having much greater influence on community characteristics, relative to their low abundance or biomass are called:


160) Which of the following is pioneer in succession in hydarch?


161) Select the correct statement:


162) An association of two species in which both species are benefited is called:


163) Succession involves a turnover of species during:


164) Select the statement, which best explains commensalism:


165) Community is best defined as aggregation of:


166) Parasite can be best explained as an organism which depends on: