C
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0.218. Mendel arrived at a clear understanding of heredity
before a satisfactory theory was available because
(a) he studied one trail at a time
(b) he had unlimited funds
(c) he was aware of the behaviour of chromosomes
(d) he was unaware of the behaviour of chromosomes.
Q.219Copulation in the earthworm involves
(a) mutual exchange of sperm
(b) mutual exchange of eggs
(c) mutual exchange of sperm and eggs
(d) unidirectional transfer of sperm.
Q.220. The earthworm differs from Neanthes (Nereis) in
that it lacks
(a) chitinous structures
(b) separation of the sexes
(c) well-developed head
(d) closed circulatory system.
Q.221. The structure in annelids which provides increased
absorptive surface in the digestive system is
(a) clitellum
(b) septum
(c) typhlosole
(d) coelom
Q.222. The phenotype of an animal can be determined
(a) by test-breeding
(b) by testing for linkage
(C) if it is a homozygous recessive
(d) by looking at it.
Q.223. The discovery that mutations could be induced
artificially depended upon
(a) the discovery of X rays
(b) finding a technique for counting legal mutations
(C) finding a technique for counting visible mutations
(d) unlimited funds.
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