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 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.
After fertilization,
(i) the ovary of the flower transforms into fruit, and
(ii) the ovules of the flower develop into seeds.
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- (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
- 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.
- (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
- (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) Explain the term 'fertilisation'.(b) Give some examples of different modes of fertilisation in nature?(c) What type of fertilisation takes place in (i) fish, and (ii) birds?
- In what ways is fertilisation in a plant:(a) similar to fertilisation in a human? (b) different from fertilisation in a human?
- (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?
- Differentiate between internal fertilisation and external fertilisation.
- What is the name of:(a) male part of a flower?(b) female part of a flower?
- Choose the most appropriate answer.(a) Internal fertilisation occurs(i) in female body.(ii) outside female body.(iii) in male body.(iv) outside male body.(b) A tadpole develops into an adult frog by the process of (i) fertilisation(ii) metamorphosis(iii) embedding(iv) budding(c) The number of nuclei present in a zygote is(i) none(ii) one(iii) two(iv) four
- 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.
- Describe female and male gametes in flower.
- The top part A of the flask-shaped reproductive organ X in the flower of a plant secretes a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y in the flower falls on part A, it grows a long tube F through the organ X in response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.(a) What is (i) organ X, and (ii) organ Y, inside the flower?(b) Name parts (i) A (ii) B, and (iii) C, of flask-shaped.(c) Name (i) grain D, and (ii) part E of organ Y.(d) Name the tube F.(e) What is the phenomenon of growing a long tube in response to a sugary substance in the process of fertilisation in a flower known as?
- In a flower, the parts that produce male and female gametes are respectively:(a) sepal and anther (b) filament and stigma (c) anther and ovary (d) stamen and style
- The male gametes in a flower and in a human are produced respectively in:(a) stigma and ovary (b) anther and style (c) ovary and testes (d) anther and testes
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