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Selina Solutions Class 9 Biology Solutions for Exercise in Chapter 5 - Pollination And Fertilization

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Question 18 Exercise

Given below is a diagrammatic representation of the process of fertilization. Study the same and then answer the questions that follows:

(a) Name the parts labeled 1,2,3,4, 5 and 6.

(b) What happens to (i) Ovary (ii) Ovule after fertilization?

(c) What is the function of the synergids?

(d) What part does the stigma play in the process of fertilization? Question 18 Image - Selina Solutions CONCISE Biology - Class 9 ICSE chapter Pollination And Fertilization

Answer:

(a) The labelings are as follows:

1 – style

2 – Pollen tube

3 – Polar nuclei

4 – Embryo sac

5 – Antipodal cells

6 – Micropyle

(b) The following are the changes that occur after fertilization:

(i)Ovary – It enlarges for the formation of fruit. The ovarian wall goes on to form the fruit

wall.

(ii) Ovule – Develops to become the seed.

Selina Solutions For Class 9 Biology Chapter 5 – Pollination And Fertilization

(c) Function of synergids –

• It nourishes the egg cell thereby guiding the pollen tube towards the egg

• Ensures proper functioning of the pollen tube

• Responsible for the release of the sperm nuclei

(d) Role of stigma –

During pollination, pollen grain is transferred to the stigma. Pollen grains are germinated only in the event of it falling on the stigma. Post germination, the pollen tube grows through the stigma, reaching the ovary in order for the egg cell to be fertilized.

Video transcript
"hello everyone welcome to lido this is priya and here we have a question about fertilization in plants let us look into the question given below is a diagrammatic representation of process of fertilization study the same and then answer the questions that follows let us see the first question name the parts labeled 1 2 3 4 and 4 5 and 6. the first part in this is a style which is a female reflective part in a flower the first part is style and second part is a pollen tube which forms from the pollen grain and the third part is this is a polar nuclei we can also call this as secondary nucleus polar nuclei and the fourth part is embryo sac embryo sag in which the seed develops and the fifth one are the antipodals these are the antipodal cells and the sixth one is a microphile through which the pollen nuclei enters micro pile through which the pollen male gamete will enters into this egg so let us look into the second question what happens to one ovary to ovule after fertilization so after fertilization ovary forms into fruit and ovule forms into seed having embryo in it so ovary it enlarges for the formation of fruit and this ovary wall here this this is the ovary wall and this ovary wall forms into fruit wall and ovule develops to become a seed and let us look into the third question what is the function of signatures synergets are the two cells which are present on both sides of egg and these synergies have various functions coming to the first function it helps in nourishing it nourishes nourishes the egg egg after fertilization and these synergies also help for navigating for showing the way for the pollen tube towards the egg and the second is it ensures proper functioning of the volunteer synergies helps ensures in proper functioning of of pollen tube this is about the synergies hope you understand this question if you are like my video please subscribe to our little channel and if you have any doubts you can keep a message in comment box thank you "
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