Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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21.

Phototropic curvature in Avena coleoptile is the result of uneven distribution of

  • auxin

  • starch

  • gibberellins

  • phytochrome


A.

auxin

The Cholodny-Went theory, states that plant tropisms in roots and shoots are due to the unequal distribution of the growth regulator auxin in reponse to light or gravity, presented a simple and direct explanation of these phenomena.


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22.

Study of bakanae disease of rice led to discovery of

  • auxins

  • bakery rice

  • Both (a) and (b)

  • gibberellins


23.

Equipment used for the measurement of growth in plants is known as

  • respirometer

  • auxanometer

  • atmometer

  • potometer


24.

First transistory chemical formed by reaction between CO2 and RUBP is

  • PGA

  • PGAL/ GAP

  • dihydroxy acetone phosphate

  • 2 carboxy, 3-keto, 1-5 biphosphoribotol


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25.

Tendrils exhibit

  • seismonasty

  • geotropism

  • heliotropism

  • thigmotropism


26.

The carboxylating enzyme present in bundle sheath cells of maize leaves is

  • RUBP carboxylase

  • hexokinase

  • carbonic anhydrase

  • PEP-carboxylase


27.

Which of the following groups of plants are propagated through underground root?

  • Pistia, Chrysanthemum and pineapple

  • Ginger, potato, onion and zamikand

  • Sweet potato, Asparagus, Tapioca and dahlia

  • Bryophyllum and Kalanchoe


28.

Artificial induction ofroots on stems before it is separated from the parent plant for propagation is called

  • layering

  • root-stem joint

  • cutting

  • plant tissue culture


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29.

Consider the following four statements I, II, III and IV and select the right option.

I. The floral formula for Liliaceae is

P3 + 3 A3 + 3G3

II. In vexillary aestivation, the large posterior petal is called, standard, two lateral ones are wings and two small anterior petals are termed keel.

III. In pea flower the stamens are monoadelphous.

IV. The floral formula for Solanaceae is

K(3) C(3) A(14)G(2)

The correct statements are

  • II and III

  • I and III

  • I and II

  • III and IV


30.

Which of the following is the scientific or botanical name of Asafoetida (Hing)?

  • Curcuma longa

  • Curcuma amada

  • Alpinia galanga

  • None of these


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