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प्रश्न
Mention the changes a flower undergoes after fertilisation.
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उत्तर
- The outer layers of the ovule become impervious and hard and function as a seed coat. An ovule with an embryo inside is called a seed.
- The ovary enlarges and ripens to become a fruit. Other floral parts such as sepals, petals, stamens, styles, and stigma may fall off. However, in some cases, they remain persistent in the fruit.
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संबंधित प्रश्न
How does the process of fertilisation take place in flowers?
Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
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.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
The male reproductive part of a flower is ______.
Conidia are formed endogenously while zoospores are formed endogenously.
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.
Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
