Biology - Mock Test 23

Question 221

Transport of food material in higher plants takes place through

A) companion cells B) transfusion tissue C) tracheid's D) sieve elements

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Question 222

Which one of the following is monoecious

A) Marchantia B) Cycas C) Pinus D) Date palm

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Question 223

A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called

A) monohybrid cross B) back cross C) test cross D) dihybrid cross

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Question 224

The Indian rhinoceros is a natural inhabitant of which one of the Indian state

A) Uttarakhand B) Uttar Pradesh C) Himachal Pradesh D) Assam

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Question 225

Black (stem) rust of wheat is caused by

A) Alternaria solani B) Ustilago nuda C) Puccinia graminis D) Xanthomonas oryzae

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Question 226

Root development is promoted by

A) abscisic acid B) auxin C) gibberellin D) ethylene

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Question 227

Which one of the following cannot be used for preparation of vaccines against plague

A) Formalin - inactivated suspensions of virulent bacteria B) Avirulent live bacteria C) Synthetic capsular polysaccharide material D) Heat-killed suspensions of virulent bacteria

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Question 228

The lac operon consists of

A) four regulatory genes only B) one regulatory gene and three structural genes C) two regulatory genes and two structural genes D) three regulatory genes and three structural genes

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Question 229

Crocodile and penguin are similar to whale and dogfish in which one of the following features

A) possess a solid single-stranded central nervous system B) lay eggs and guard them till they hatch C) possess bony skeleton D) have gill slits at some stage

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Question 230

Vegetative propagation in Pistia occurs by

A) stolen B) offset C) runner D) sucker

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