Practice Test


1) Embryo rescue for successful hybridisation in interspecific crosses can be achieved by:


2) Somaclonal variations are those which appear during:


3) One of the recent methods of crop improvement is the protoplast technology. The protoplast of two different varieties can be made to fuse with the help of:


4) Orthodox seeds are those:


5) Why is a shoot tip culture preferred for international exchange of germplasm?


6) Cryopreservation is:


7) Seeds that are killed by drying and freezing temperature are termed:


8) Crops with recalcitrant seeds include:


9) Why haploids are preferred of their use in breeding programmes?


10) Genetic material, especially that contained within the reproductive cell is called:


11) The most convenient way to maintain plant germplasm is:


12) Triticale is man-made cereal obtained through hybridisation between:


13) Plants with similar genotypes are:


14) Aim of plant breeding is to:


15) Pure line breeds refer to:


16) Sharbati Sonora variety of wheat was obtained by:


17) Somatic hybrids are useful in introducing genes for:


18) Plasmids of which organism are frequently used in the production of transgenic plants?


19) Genetic transformation is possible through:


20) Hybridisation through protoplast fusion is called:


21) Four inbred lines of wheat are crossed. The cross is called:


22) Scientists are trying to get hybridisation between tomato and potato. The most accurate name would be:


23) Which one of the following crops was subjected the most to continuous selection and domestication by man?


24) Desired improved varieties of economically useful crops are raised by:


25) How are seeds in a gene bank stored?


26) What are transgenic plants?


27) Improved varieties of wheat suitable for Indian climate have been developed by:


28) Which of the following is not used for crop improvement?


29) Heterosis is:


30) Inbreeding is possible between two members of:


31) Polyploidy is often the result of:


32) Among the following which one is the best chemical for inducing the polyploidy?


33) At cryopreservation of germplasm the biological activity:


34) What is triticale?


35) Improved rice variety IR-8 has been introduced in India from:


36) What is gene bank?


37) The dwarfing gene Dee-geo-woo-gen is found in:


38) Norin-10 gene from Japan is a:


39) Who among the following is known as father of Green revolution?


40) PUSA is a variety of:


41) Sharbati Sonora is an example of:


42) Most cultivated plants of world today are examples of:


43) Polyploidy results in:


44) Taichung is a dwarf variety of rice. Its original home is:


45) Method of selection in vegetatively propagated plants is:


46) Hybrid vigour is due to:


47) Sonora and Lerma Rojo are varieties of:


48) Potato and apples are multiplied by:


49) Aneuploidy is commonly observed in different varieties of:


50) N. J. Borlaug was awarded Nobel prize for his work on wheat breeding. He received this prize in the branch of:


51) Banana is generally seedless because it is:


52) Triploid are said to more useful than other polyploids because these are:


53) Triticum durum was possible fertilised by a wild grass which is thought to have given rise to:


54) Triticale has been developed through intergeneric hybridisation between:


55) Green revolution refers to:


56) Dwarf wheat varieties were evolved by:


57) Technique used in agriculture biotechnology is:


58) Important use of agriculture biotechnology is to:


59) Dwarf wheat varieties brought into India from Mexico were:


60) Credit for bringing green revolution to India goes to:


61) IR-36 was developed at IRRI by Gurdev S. Khush through breeding of:


62) Pomato involves the plants:


63) In India the state famous for peanut cultivation is:


64) In crop improvement programme haploids are of considerable importance because they:


65) A major application of embryo culture is in:


66) Dr. M. S. Swaminathan could produce an amber seeded high yielding wheat variety called 'Sharbati sonora' from Mexican dwarf variety by using:


67) The hexaploid wheat is obtained by:


68) If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be:


69) Scientist associated with cloning of sheep:


70) The bacterial disease, which is found in chickens is:


71) A cybrid is a hybrid carrying:


72) India's wheat yield revolution in the 1960s was possible primarily due to:


73) Three crops that contribute maximum to grow grain production are:


74) Golden rice is a transgenic crop of the future with the following improved trait:


75) An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the:


76) Which of the following is generally used for induced mutagenesis in crop plants?


77) One of the most important functions of botanical gardens is that:


78) Genetic diversity in agricultural crops is threatened by:


79) One of the ex situ conservation methods for endangered species is:


80) All forms of life should be conserved because:


81) Triticale, the first man-made cereal crop, has been obtained by crossing wheat with:


82) Crop plants grown in monoculture are:


83) Farmers in a particluar region were concerned that premature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?


84) Golden rice is a promising transgenic crop. When released for cultivation, it will help in:


85) In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are:


86) Which of the following is/are important in the development of phenotype?


87) HUW 486 variety obtained through hybridisation is an improved variety of which plant?


88) In plant breeding which of the following is involved in creation of genetic variation?


89) In India which organisation is involved in evaluation and release of improved varieties of plants?


90) Germplasm is sum total of all alleles of the genes present in crop and its related species. The germplasm of any crop species would consist of which type of materials?


91) Loss of vigour associated with inbreeding is termed:


92) Late blight of potato is caused by:


93) In cross breeding of animals, the progeny will be similar to selected breeds in how many generations?


94) A hybrid variety of rice having long and scented grain is:


95) A contagious disease called anthrax affects cattle, buffaloes, horse, sheep and goats is caused by:


96) Which of the following is disease of cattle?


97) Which of the following is most commonly used for creation of genetic variation?


98) Which of the following is the consequence of plant disease?


99) Production of which of the following involves the use of colchicine:


100) Viruses enter into their host through which of the following?


101) Which of the following is not correct about plant?


102) Which of the following animal diseases is caused by a virus?


103) Mule is produced by which of the following?


104) Which of the following plant diseases cannot be controlled by chemical treatment?


105) Hybrids are produced by crossing inbreds in which of the following?


106) In the following table identify the correct the correct matching of the crop, its disease and the corresponding pathogen.
Crop : Disease : Pathogen.


107) Maximum genetic variation can be created through


108) The process of cultivating and bringing about certain changes in the wild forms so that they yield better, under artificial growing conditions is called


109) Culture of isolated microspores results in the formation of


110) Disease free plants are obtained from


111) Haploids are considered better genetic stock because they


112) Germplasm also preserve rare genotype for


113) Autopolyploidy can be induced artificially by


114) The application of induced mutations for crop improvement is called


115) What was the source of first induced mutations?


116) Pollen grains of a plant whose 2n = 28 are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?


117) Mutations is red grained Sonara 64 variety of wheat resulted in the amber grain colour mutant


118) Protection of genetic resources is called


119) Correct chronological order of the events occurring during callus culture is


120) Choose the correct answer


121) Hybrid vigour is eroded through


122) Wild varieties of plants must be conserved to


123) Electrofusion or chemofusion is used for


124) The loss of genes from a gene pool is called


125) The enzyme used for isolation of single cells from explant is


126) A hybrid where cytoplasm of two parent cells are fused by retaining only one parental nucleus is called


127) Haploids are more suitable for mutation studies than diploids. This is because


128) Somatic hybridization is accomplished by


129) Constraints of conventional breeding are


130) New methods of obtaining plant breeds includes


131) Mutational breeding has produced the variety of mung bean which is resistance to