Question 1

The ovary after ferilization is converted into:

Accepted Answer

After fertilisation, the ovule is converted into seed and ovary into fruit.

Question 2

Micropyle of seed facilitate in the entry of:

Accepted Answer

Correct answer is D

Question 3

The given figure is associated to double fertilization. A, B, C D. E. F and G are identified respectively.

Accepted Answer

Correct answer is D

Question 4

When the pollen tube enters through the micropyle, it is termed as:

Accepted Answer

Porogamy is the most common way in angiosperms e.g., Lily.

Question 5

Female gametophyte of a typical dicot at the time of fertilization is:

Accepted Answer

In mature female gametophyte, 3 antipodal cells, 2 synergids, 1 egg and 1 diploid secondary nucleus are present.

Question 6

Which one of the following events takes place after double fertilization?

Accepted Answer

Correct answer is D

Question 7

Double fertilization was discovered by?

Accepted Answer

Double fertilization was discovered by Nawaschin, (1898) in Fritillaria and Lilium.

Question 8

When pollen tube enters by integuments, then the process is called:

Accepted Answer

In mesogamy pollen tube penetrates laterally through intequments (Cucurbita) and funiculus (e.g., Pistacia).

Question 9

Double fertilization is a characteristic feature of:

Accepted Answer

Double fertilization is a unique characteristic of angiosperms. At the time of fertilization, a pollen tube is formed which contains two male gametes The first male gamete fuses with the egg cell to form a zygote, while the second male gamete fuses with the diploid central cell of embryo sac to form a triploid endosperm cell. This process is known as double fertilization.

Question 10

Fertilization of egg takes place inside:

Accepted Answer

Because egg is the part of embryo sac.

Question 11

Which of the following floral parts forms pericarp after fertilization?

Accepted Answer

After fertilisation, the mature, ripened ovary develops into a fruit. The ovary wall forms the covering of the fruit called fruit wall or pericarp.

Question 12

Which of the following is not true for double fertilization?

Accepted Answer

Double fertilization is a chief trait of flowering plants. In the phenomena, one female gamete unites with two male gametes. One of the male gametes fertilizes the egg resulting in the formation of a zygote (2n) and the other unites with 2 polar nuclei for the formation of an endosperm (3n).

Question 13

The nuclei of the sperm and egg fuse as a result of:

Accepted Answer

Correct answer is D

Question 14

Number of nuclei taking part in double fertilization is.

Accepted Answer

5 i.e., 2 sperm nuclei, 2 polar nuclei and one egg nucleus.

Question 15

Fusion of two dissimilar gametes is called:

Accepted Answer

Correct answer is A

Question 16

A pollen tube grows down the style because:

Accepted Answer

A filiform apparatus is a group of finger-like projections of synergids that are mainly involved in conducting and absorbing food material from the nucleus into the embryo sac. They also secrete certain chemicals that direct the pollen tubes towards the embryo sac.

Question 17

Double fertilization results in the production of:

Accepted Answer

Double fertilization is characterized by the formation of: the embryo-proper which is diploid, and the fusion product of the central cell with one male gamete which is triploid. This secondary triploid nucleus develops into the endosperm.

Question 18

In a mature embryo sac the central cell is:

Accepted Answer

Correct answer is B

Question 19

What is the fate of the male gametes discharged in the synergid?

Accepted Answer

In flowering plants, out of the two male gametes discharged in synergids, one fuses with the egg and other fuses with the secondary or definitive nucleus present in central cellEgg (n) + 1st male gamete (n) → Zygote (2n)Secondary nucleus + 2nd male gamete (n) →			(2n)central cell nuclei)														PEN (3n)

Question 20

Double fertilization is

Accepted Answer

Double fertilization is a unique characteristic of angiosperms. At the time of fertilization, a pollen tube is formed which contains two male gametes The first male gamete fuses with the egg cell to form a zygote, while the second male gamete fuses with the diploid central cell of embryo sac to form a triploid endosperm cell. This process is known as double fertilization.

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Solutions for Fertilization Important Questions

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