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प्रश्न
Prepare a slogan for campaign against female foeticide.
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उत्तर
Avoid female foeticide, save girl child
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संबंधित प्रश्न
What is pollination?
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
State significance of pollination.
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
How does the process of fertilisation take place in flowers?
State the name of the functional unit concerned with sexual reproduction.
Name the male part of the flower.
What is made in ovary of a flower?
Give some examples of different modes of fertilisation in nature?
(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?
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
The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
What are the male and female gametes in a flowering plant?
You have to perform the experiment, "To identify the different parts of an embryo of a gram seed." Describe the procedure that you would follow.
The students of a class were asked by the teacher to study the different parts of an embryo of an angiosperm. Given below are the essential steps for the experiment :
A. Soak the seeds in plain water and keep them overnight.
B. Cut open the soaked seed and observe its different parts.
C. Take some healthy seeds in a petri-dish.
D. Drain the excess water, cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(a) C, A, D, B
(b) C, D, A, B
(c) A, C, D, B
(d) A, C, B, D
Identify A, B, C and D in the given diagram and write their names.
Explain the process of fertilisation in flowers.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
What is phototropism?
Describe an activity to demonstrate phototropism.
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Draw a neat and labelled diagram.
Double fertilization in angiosperms
The anther wall consists of four wall layers where ______
In which of the following manner the arrangement of megaspores in a tetrad is observed in angiosperms?
The flower of the Hibiscus plant is ______
The seed that contains the future plant is called the ______
The process of release of eggs from the ovary is called ______
Pollen grains are produced by ______
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Sketch and label the essential and accessory whorls of flower.
Give any two examples of agents of pollination.
What is the structural unit of sexual reproduction in plant?
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
Type of sexual reproduction is ______.
State the post-fertilisation changes that lead to fruit formation in plants.
