Question

❷ Write in brief about the post fertilization changes taking place in a flower.

❸ Explain the different methods of vegetative reproduction in plant .

❹ Explain the various changes taking place in the utary wall during fertilization .

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Answer 1

Hey Mate,

Here's your answer,

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Ques : Write in brief about the post fertilization changes taking place in a flower.

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Ans : Fertilization is the process of fusion of the female gamete (ovum or egg) and the male gamete produced in the pollen tube by the pollen grains.

Post- fertiliztion changes in a flower include-

1. The diploid zygote develops into an embryo that forms the future plant.

2. The endosperm cells provides the required nutrition for the developing embryo.

3. The ovule forms the seed.

4. The ovary forms the fruit.

5. The outer and inner integuments of the ovule forms the testa or the seed coat of the seed.

7. Petals and sepals fall off.

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Ques : Explain the different methods of vegetative reproduction in plant .

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Ans : The vegetative plant structures arising from the stem are known as rhizomes, bulbs, runners, tubers, etc. The plants propagated vegetatively are given below:

• Stem

Runners grow horizontally above the ground. The buds are formed at the nodes of the runners.

• Roots

New plants emerge out of swollen, modified roots known as tubers. Buds are formed at the base of the stem.

• Leaves

Leaves of a few plants get detached from the parent plant and develop into a new plant.

• Bulbs

Bulbs have an underground stem to which the leaves are attached. These leaves are capable of storing food. The centre of the bulb contains an apical bud that produces leaves and flowers. Shoots are developed from the lateral buds.

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Ques : Explain the various changes taking place in the utary wall during fertilization .

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Ans : Menstrual cycle is divided in distinct pre-ovulatory and post-ovulatory phases. In first 14 days of preovulatory phase, ovary secretes oestrogen. This hormone helps the endometrial lining of uterus to undergo proliferation and thickening.

After ovulation, from 15th day onwards, ovary starts secreting progesterone. This hormone will help the uterine thickening to remain intact.

Endometrial glands also start secreting nourishing fluid to make the uterus more welcoming for an embryo (as there is possibility of fertilisation of the egg in fallopian tube). Thus the uterus is said to be in secretory phase from 15th day onward.

This will lead to regression of endometrial glands. There will be beginning of degeneration of endometrial thickening from 24th day onwards (in absence of fertilisation and implantation), upto the beginning of a new cycle (which is generally upto 28th day).

A new cycle starts when degenerated endometrial tissue slough off and comes out as menstrual secretion, this is regarded as 1st day of next new cycle.

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Answer 2

Explanation:

Post-fertilization changes in flower are: 1) The sepal, petal and stamen of the flower withers and fall off only pistil remains attached to the plant. 2)The ovules develop into the seed. 3)The zygote develops into the embryo.