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प्रश्न
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Why cannot fertilization take place in flowers if pollination does not occur?
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उत्तर
In flowering plants, male gametes are produced in the pollen grains inside the anther. Pollination brings the pollen grains having male gametes from the anther to the stigma. Upon successful arrival of pollen grains on the stigma, a pollen tube is formed where they take male gamete to the female gamete or egg present in the ovule for fertilisation. So, if pollination does not occur, fertilisation will also not take place.
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संबंधित प्रश्न
A flower may have either male or female reproductive parts. Such a flower is called ______.
Name the male part of the flower.
What is made in ovary of a flower?
Explain the term 'fertilisation'.
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of b contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?
Mention the function of Anther.
What part is played by stamens and carpels in reproduction?
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Explain the sexual reproduction process in plants with a diagram.
Which of the following are the chemical components of the wall of pollen tube?
Identify the female gametophyte in angiosperms.
In a flowering plant, archesporium gives rise to ______.
Variations occur as a result of ______
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?
| Flower X | Flower Y | Flower Z |
 |
 |
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