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100 Important Questions - Biology
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Contents - 100 Important Questions - Biology Best Suitable for classes 1 to 10 Students
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Biology 100 Important Questions andAnswers
1) Which is the first oxygen producing organism?
Answer: Autotrophic cyanobacteria.
2) How much biosphere extends to the distance?
Answer: 22.5 Km.
3) How the populations of different species are is kept under check?
Answer: By food chain.
4) Who is the most recent and most highly evolved amongst organisms?
Answer: Human species
5) What two special characteristics are found in human beings which have made
them masters?
Answer: Highly evolved brain, skilled hand.
6) What is nebula?
Answer: It is the name of cold cosmic cloud of dust and gas which is believed to
condense and form star, planets and their satellites.
7) Who first put forward the nebular hypothesis of origin of solar system?
Answer: Kant.
8) What helped in forming different types of organic compounds on earth from
inorganic salts, minerals and gases in beginning?
Answer: High temperature, ultra-violet rays and lightning.
9) Who first proposed that life originated from non-living substances through
chemical processes?
, Answer: Oparin.
10) What is the name of the theory that believes life originated from inorganic
substances through chemical processes?
Answer: Physico-chemical theory/ Naturalistic theory/ Theory of
Chemosynthetic origin.
11) Why were the first organisms an aerobic?
Answer: The atmosphere of the earth did not possess oxygen at that time.
12) When did prokaryotes originate on earth?
Answer: 4200 million years back.
13) When in the history of earth did eukaryotes develop?
Answer: 1600-million years back.
14) What four features constitute the basic unity of all living beings?
Answer: Cell structure, metabolism, replication and homeostasis.
15) Which is the smallest angiosperm?
Answer: Wolffia arrhiza.
16) What peculiarity is found in cicada?
Answer: It lives for seventeen years but leads an active life of only five weeks.
17) What are the three components of earth?
Answer: Hydrosphere, Lithosphere, Atmosphere.
18) What is the name of the theory which believes that life originated
somewhere else and it came to earth through meteorites?
Answer: Cosmozoic or interplanetary theory.
19) What discovery formed the basis of agriculture?
Answer: Seeds are the source of replenishment of plants.
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