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Last Updated On [03-11-2023]

Identify the wrong statements

a)

The ovule develops into seed

b)

The ovary develops into fruit

c)

The triple nucleus develops into endosperm

d)

Double fertilisation is the fusion of male gamete with egg


Question ID - 1452 :-

Identify the wrong statements

a)

The ovule develops into seed

b)

The ovary develops into fruit

c)

The triple nucleus develops into endosperm

d)

Double fertilisation is the fusion of male gamete with egg

1 Answer
5876 Votes
3537

Answer Key : (d) -

(d)

The double fertilisation was discovered by SG Nawaschin (1898) and Guignard in Lilium and Fritilaria. Double fertilisation is restricted only to angiosperms. When pollen tube enters ovule, it strikes one of the synergids and burst open to release the two male gametes, which fuse with two different structures in the same female gametophyte. Thus, double fertilisation can be distinguished as.

(i) Generative Fertilisation Fusion of one male gamete with the egg producing diploid zygote or oospore

(ii) Vegetative Fertilisation Fusion of nucleus of second male gamete with the diploid secondary (fused) nucleus or the triple fusion, i.e., fusion of one male nucleus and two polar nuclei forming endosperm (3 )



Next Question :

Arrange the steps of catalytic action of an enzyme in order and choose the correct option.

  1. The enzyme releases the products of the reaction and the enzyme is free for another substrate.
  2. The active site of enzyme is in close proximity of the substrate and breaks of chemical bonds of the substrate.
  3. The binding of substrate induces the enzyme to alter its shape fitting more tightly around the substrate.
  4. The substrate binds to the active site of the enzyme fitting into the active site.

a)

IV, III, II, I

b)

III, II, I, IV

c)

IV, II, I, III

d)

II, I, IV, III


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