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प्रश्न
Give some examples of different modes of fertilisation in nature?
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उत्तर
There are two modes of fertilisation, i.e., external fertilisation as seen in case of fishes and frogs, and internal fertilisation that happens in humans, dogs, etc.
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संबंधित प्रश्न
Name the parts labelled as A, B, C and D in the diagram given below:
Name the part made up of the stigma, style and ovary.
Where is the female gamete formed in flowering plants?
Fill in the following blank with suitable word :
Ovules contain ......... gametes of a plant.
How do the insects help in cross-pollination?
Fill in the blank by selecting suitable word:
A flower that bears both the male and the female parts is known as __________ flower.
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
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
Mention pollination types.
Answer the following question.
How does suitable pollination lead to fertilization?
Calyx : Sepals : : Corolla : ________________
Accessory whorls : Calyx and corolla : : essential whorls : ______________
Pollen grains from anther are transferred to the stigma.
What does germination mean?
Where does the endothecium layer of anther lobes is present?
Which of the following are the chemical components of the wall of pollen tube?
Double fertilization is exhibited by ______
In male reproductive whorl of a flower the archesporial cells are formed by ______.
