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प्रश्न
Distinguish between self-pollination and cross-pollination.
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उत्तर
In self-pollination, only one or two flowers borne on the same plant are involved, whereas in cross-pollination two flowers borne on two plants of same species are involved.
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संबंधित प्रश्न
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
The reproductive part of a plant is the ______.
The process of fusion of the male and female gametes is called ______.
Name the part made up of the stigma, style and ovary.
What are the reproductive organs in a flower?
Fill in the following blank with suitable word :
The female organ of reproduction in the flower is the...........
Explain the terms 'self pollination'
How do the insects help in cross-pollination?
How does pollination occur?
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
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
One of the following occurs in the reproductive system of flowering plants as well as that of humans. This is :
(a) vas deferens
(b) anther
(c) ovary
(d) style
Put a tick mark (✓) against the correct alternative in the following statement
Reproductive whorls of a flower are:
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower.
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
Mention the function of Anther.
What are the male and female gametes in a flowering plant?
What part is played by stamens and carpels in reproduction?
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Find the odd one out:
__________ is present in unisexual flower.
Calyx : Sepals : : Corolla : ________________
Where does the endothecium layer of anther lobes is present?
The anther wall consists of four wall layers where ______
Antipodal cells are present towards the ______ in an anatropous ovule.
The 3-celled egg apparatus at the micropylar end comprises of ______
Identify the female gametophyte in angiosperms.
Variations occur as a result of ______
In a plant flower the female whorl is ______.
Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
The pollen tube usually enters the embryo sac ______.
Given below is a diagram of a germinating seed. Label the parts that:
- gives rise to future shoot.
- gives rise to future root system.
- stores food.
The number of pollen sacs in a dithecous anther is ______.
