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प्रश्न
What is pollination? How does pollination occur?
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उत्तर
Pollination is the transfer of pollen grains from the stamen to the stigma of the pistil. Pollination occurs when pollen grains are carried from the anther to the stigma by insects, birds, wind or water.
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संबंधित प्रश्न
A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below:
Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon.
On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:
(a) Testa, Radicle, Cotyleddon
(b) Tegmen, Radicle, Micropyle
(c) Cotyledon, Plumule, Testa
(d) Radicle, Cotyledon, Plumule
The process of fusion of the male and female gametes is called ______.
State the name of the functional unit concerned with sexual reproduction.
Fill in the following blank with suitable word :
The ovule becomes a .......... after fertilisation.
How is the process of pollination different from fertilization?
Explain the term 'fertilisation'.
Which of the following statements are true for flowers?
(i) Flowers are always bisexual.
(ii) They contain sexual reproductive organs.
(iii) They are produced in all groups of plants.
(iv) after fertilization they give rise to fruits.
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
Fill in the blanks:
A carpel consists of ________ , ________ and ________.
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.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Find an odd one out.
Define.
Inflorescence
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Identify the parts A, B, C, and D?
Generally, in a pollen tube, which of the following moves to the tip of the tube?
The 3-celled egg apparatus at the micropylar end comprises of ______
Length of pollen tube depends on the distance between ______
Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the flower.
What is the function of calyx?
