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प्रश्न
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
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उत्तर
|
Unisexual Flower |
Bisexual Flower |
|
The flower has either stamen or pistil only are called unisexual flowers. |
The flower has both stamen and pistil are called bisexual flowers. |
|
Example: Papaya |
Example: Hibiscus |
Diagram showing germination of pollen grain on stigma:
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संबंधित प्रश्न
Name the parts A, B and C shown in the following diagram and state one function of each.
Name the part made up of the stigma, style and ovary.
What type of plants reproduce by sexual reproduction method?
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Write the events involved in the sexual reproduction of a flowering plant.
a. Discuss the first event and write the types.
b. Mention the advantages and the disadvantages of that event.
The 3-celled egg apparatus at the micropylar end comprises of ______
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?
The ovaries of different flowers may contain ______.
