Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Solarisation is 

  • formation of chlorophyll

  • destruction of chlorophyll

  • utilisation of sunlight

  • effects of solar light


32.

Which is essential for root hair growth?

  • Zinc

  • Calcium

  • Molybdenum

  • Sulphur


33.

A fern prothallus is bisexual. If fertilisation takes place between their gametes than it is known as

  • cross- fertilisation

  • self- fertilisation

  • isogamous

  • viviparous


34.

Chicory powder which is mixed with coffee powder is obtained from

  • root

  • leaf

  • stem

  • seeds


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35.

Which of the following is not the feature of gymnosperms?

  • parallel venation

  • perennial plants

  • distinct branches (long and short branches)

  • xylem with vessels


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36.

In callus culture, roots can be induced by the supply of

  • auxin

  • cytokinin

  • gibberelin

  • ethylene


A.

auxin

Callus is a irregular, unorganised and undifferentiated mass of actively dividing cells. It's differentiation is under the control of two hormones: auxin and cytokinin.

Development of Condition
Root AuxinCytokinin= High
Shoot AuxinCytokinin= Low
Both root and shoot AuxinCytokinin= Intermediate


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37.

Stem cuttings are commonly used for the proprogation of

  • banana

  • rose

  • mango

  • cotton


38.

Edible part in 'sorosis', a composite fruit, is

  • cotyledons

  • endosperm

  • perianth and peduncle

  • fleshy thalamus


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39.

Which of the following is a true nut?

  • Walnut

  • Cashewnut

  • Groundnut

  • Pistachio


40.

Most primitive member, in which roots are not present, is

  • Psilotum

  • Rhynia

  • Lycopodium

  • Selaginella


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