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1 Which one of these categories has real existence?
2 A true species comprises of a population
Answer: Reproductively isolated
3 Nicotiana sylvestris flowers only during long days while N.tabacum flowers only during short days. Under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offsprings. What is the best reason for considering Nicotiana sylvestris and N.tabacum as separate species?
Answer: They fail to interbreed in nature
4 One of the first acts in taxonomy is
5 In majority of higher animals and plants,_____ and _____ are mutually exclusive events.
Answer: growth; reproduction
6 In multicellular organisms _____refers to the production of progeny possessing features more or less similar to those of parents.
7 The order generally ends with
8 Which of the following are unique features of living organisms?
9 Which of the following aspects is an exclusive characteristic of living things?
Answer: Perception of events happening in the environment and their memory.
10 Which of the following term is used to refer the number of varieties of plants and animals on earth ?
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