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1 CORRECTIONS (+2) EXEMPLAR BIOLOGY List of Multiple-choice questions for which wrong answers were given in the first edition of NCERT exemplar and had not been corrected even in the errata. Now these are corrected as follows- Strategies for Enhancement in Food Production 15. The biggest constraint of plant breeding is: a) availability of desirable gene in the crop and its wild relatives b) infrastructure c) trained manpower d) transfer of genes from unrelated sources. Earlier Wrong Ans.Given-(d) Now Corrected to - (a) Organisms and Populations 1. Autecology is the: a) Relation of a population to its environment b) Relation of an individual to its environment c) Relation of a community to its environment d) Relation of a biome to its environment Ans. (b) Hint: Exemplar gives the answer as (b) but, Autecology is the study of reciprocal relationships between every stage of development of a population/ species/ individual and its environment. Thus both (a) and (b) are correct. They have accepted our suggestion but misinformed that it has been uploaded online. 20. Which one of the following organisms reproduces sexually only once in its life time? a) Banana plant b) Mango c) Tomato d) Eucalyptus Ans. (d) Hint: Tomato is an annual plant and it reproduces sexually only once in its life time. Thus the correct answer is (c) tomato. In the Errata, NCERT has given the answer (a), which is again a wrong answer. Cultivated species of banana do not show sexual reproduction. They have accepted our suggestion but misinformed that it has been uploaded online. Biodiversity and Conservation 5. Which one of the following state is not a major characteristic feature of biodiversity hotspots? a) Large number of species b) Abundance of endemic species c) Large number of exotic species d) Destruction of habitat Earlier Wrong Ans. given (d) Hint: Exemplar gives the answer as (d), but the correct answer is (c). NCERT Textbook (pg. 266) itself says that biodiversity hotspots have high degree of endemism and these hotspots are also regions of accelerated habitat loss. They have accepted our suggestion and changed the options as c) Mostly located in Polar Regions d) Mostly located in tropics But Ans still given as (d) Therefore still wrong, it should be- (c) Mostly located in Polar regions. 2 Ecosystem 14. The sequence of communities of primary succession in water is: a) Phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees. b) Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees. c) Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees. d) Phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees. Earlier Answer changed to (b) which was Wrong . Now Corrected to - (d) Biotechnology & Its Applications: 7. The site of production of ADA in the body is: a) Erythrocytes b) Lymphocytes c) Blood plasma d) Osteocytes Earlier Wrong Ans.Given-(c) Now Corrected to - (b) Evolution 1. Which of the following is an example for link species? a) Lobe fish b) Dodo bird c) Sea weed d) Tyrannosaurus rex Earlier Answer changed to (d) which was Wrong . Now Corrected to - (a) and option (d) changed to Chimpanzee , so no controversy at all now.