(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)
(b) The pollen tube is a tube that carries the male gamete cells from the pollen grain (or from the stigma of flowering plants) towards the ovules located at the base of the pistil for the process of fertilization.
(c) After fertilization,
(i) ovules of the flower develop into seeds, and
(ii) the ovary of the flower transforms into fruit.
Related Articles
- 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
- 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?
- 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.
- DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage- The transfer of pollen from the another to the stigma of a flower is called pollination.If the pollen of a flower lands on the stigma of the same flower, or on the stigma of another flower of the same plant, it is called self-pollination. When the pollen of a flower lands on the stigma of another flower of a different plant of the same kind, it is called cross-pollination.In cross-pollination,(a) the pollen of a flower lands on the stigma of another flower of the same plant.(b) the pollen of a flower lands on the stigma of another flower of a different plant of the same kind.(c) both the above are correct.(d) none of these is correct.
- DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage- The transfer of pollen from another to the stigma of a flower is called pollination. If the pollen lands on the stigma of the same flower it is called self-pollination. When the pollen of a flower lands on the stigma of another flower of the same plant, or that of a different plant of the same kind, it is called cross-pollination. Which of the following can carry pollen grains?(a) wind.(b) water.(c) both wind and water.(d) none of these.
- 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?
- 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.
- Study Pollen Germination on a Slide
- (a) Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.(b) Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.(c) What is made in (i) anther, and (ii) ovary, of a flower?
- (a) Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.(b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower? (c) What are (i) stamen, and (ii) carpel, in a flower? (d) What is the other name of carpel of a flower? (e) What is the name of yellow powdery substance present in the anther of a flower?
- Tick the correct answer:(a) The reproductive part of a plant is the (i) leaf(ii) stem(iii) root(iv) flower(b) The process of fusion of the male and the female gametes is called(i) fertilisation(ii) pollination(iii) reproduction(iv) seed formation(c) Mature ovary forms the(i) seed(ii) stamen(iii) pistil(iv) fruit(d) A spore producing organism is(i) rose(ii) bread mould(iii) potato(iv) ginger(e) Bryophyllum can reproduce by its(i) stem(ii) leaves(iii) roots(iv) flower
- Fill in the blanks:(a) The production of new individuals from the vegetative part of the parent is called _____.(b) A flower may have either male or female reproductive parts. Such a flower is called _______.(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____.(d) The fusion of male and female gametes is termed as _____.(e) Seed dispersal takes place by means of _____, _____, and _____.
- (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 of human brain and label on the following parts:(i) Midbrain(ii) Pituitary gland(iii) Cerebellum
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