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General ScienceEasyAsked in: NDA · NDA-II 2022, GAT

After fertilization, the fruit and the seed are produced by

  1. A.ovule and ovary, respectively
  2. B.ovary and ovule, respectively
  3. C.ovary, no ovule required
  4. D.ovule, no ovary required

Correct answer

B. ovary and ovule, respectively

Explanation

The correct answer is B, ovary and ovule, respectively. After fertilisation the ovary of the flower grows into the fruit, and each ovule inside it develops into a seed.

In a flower, pollen reaches the stigma and a pollen tube carries the male gamete down to the ovule, where it fuses with the egg. The fertilised egg becomes the embryo, the ovule wall hardens into the seed coat, and the ovary wall ripens into the fruit wall, called the pericarp. The other parts, such as petals and sepals, usually wither and fall. That is why a pea pod is a fruit and the peas inside are seeds.

A is wrong because it reverses the two; the ovule gives the seed, not the fruit. C is wrong because a seed always comes from an ovule, so the ovule is needed. D is wrong because a true fruit comes from the ovary, so the ovary is needed.

Exam tip: ovary becomes fruit, ovule becomes seed, ovary wall becomes pericarp, and zygote becomes embryo.

Practice Questions

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Q5.General ScienceAsked in: NDA · NDA-II 2023, GATMedium

Which among the following statements with respect to carbon is/are correct?

1. Carbon forms the basis for all living organisms and many things we use

2. Carbon shows tetra-valency and the property of catenation

3. Carbon forms covalent bonds with itself and other elements

4. Carbon forms compounds containing triple and tetra bonds between carbon atoms

Select the correct answer using the code given below :

  1. A.1 only
  2. B.1 and 2 only
  3. C.1, 2 and 3
  4. D.2 and 4
Show answer
Correct answer: C. 1, 2 and 3

Statements 1, 2 and 3 are true, but carbon never forms a quadruple, or tetra, bond between two carbon atoms.