Define the terms pollination and fertilization. Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following: pollen grain, male gamete, female gamete and ovary.
Pollination is the process where pollen grains are transferred from the male anther of a flower to the female stigma, for the fertilization and production of seeds.
Pollination is done either by biotic agents like insects, birds, and bats or by abiotic agents like wind and water.
Fertilization is the process in which the nuclei of the female gamete and male gamete unite together in the ovary of the flower to form a diploid zygote.
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- In the last year board examination, Arun was asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?(a) The transfer of pollen grains from the anther of a stamen to the stigma of a pistil is called pollination.(b) The process in which the male gamete present in pollen grain fuses or joins with the female gamete present in the ovule to form a new cell called zygote, is called fertilization.(c) When a pollen grain falls on the stigma of a pistil, the pollen grain grows a pollen tube downwards through the style towards the female gamete in the ovary.(d) None of the above.
- (a) Draw a diagram showing germination of pollen on the stigma of a flower and mark on it the following organs/parts :(i) Pollen Grain(ii) Pollen tube(iii) Stigma(iv) Female germ cell(b) State the significance of the pollen tube.(c) Name the parts of the flower that develop after fertilization into(i) Seed(ii) Fruit
- (a) Distinguish between cross-pollination and self-pollination. Mention the site and product of fertilization in a flower.(b) Draw labelled diagram of a pistil showing the following parts:Stigma, Style, Ovary, Female germ cell
- Draw a neat diagram showing fertilisation in a flower and label (a) Pollen tube, (b) Male germ cell and (c) Female germ cell, on it. Explain the process of fertilisation in a flower. What happens to the (i) ovary and(ii) ovule after fertilisation?
- The length of pollen tube depends on the distance between:(a) pollen grain and upper surface of stigma (b) pollen grain on upper surface of stigma and ovule (c) pollen grain in anther and upper surface of stigma (d) upper surface of stigma and lower part of style
- Fertilisation Is the Process of (A) Transfer of Male Gamete to Female Gamete. (B) Fusion of Nuclei of Male and Female Gamete. (C) Adhesion of Male and Female Reproductive Organs. (D) The Formation of Gametes by A Reproductive Organ. Justify Your Answer.
- Flowers reproduce using pollination and fertilization. Put the steps of these processes in order. Start with the first step of pollination, and end with the last step of fertilization.i) A seed is formed.ii) A grain of pollen combines with an ovule.iii) Pollinators land on a flower and some pollen gets stuck on the stigma.iv) A pollen tube grows down the style.v) Pollinators land on a flower and pick up pollen on their bodies.
- What is the meaning of pollen tube?
- The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of: (a) phototropism (b) chlorotropism (c) gravitropism (d) chemotropism
- Match the following:(a) Zygote(i) Reproductive organ(b) Sperm(ii) A clone(c) Flower(iii) Male gamete(d) Egg(iv) First cell of a new organism(e) Dolly(v) Female gamete
- Which of the following statements is/are false?a. The male gamete is larger, with a nucleus and more cytoplasm than the female gamete. b. The fusion of the two gametes is called fertilization. c. The product of fusion of the two gametes is called the zygote.(a) Only a(b) Only a and b(c) Only b(d) Only b and c(e) Only c
- The anther contains(a) sepals(b) ovules(c) pistil(d) pollen grains
- Give the scientific terms used to represent the following :(a) Bending of a shoot towards light.(b) Growing of roots towards the earth.(c) Growth of a pollen tube towards ovule.(d) Bending of roots towards water.(e) Winding of tendril around a support.
- Define pollination and its types, with the help of a labelled diagram.
- (a) Explain the terms 'self pollination' and 'cross-pollination'?(b) How do the insects help in cross-pollination?(c) How is the process of pollination different from fertilization?
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