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प्रश्न
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
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उत्तर
| Pollination | Fertilization |
| It is the process of transfer of pollen grains from the anther to the stigma of the pistil of the flower. | It is the process of fusion of male and female gametes resulting in the formation of zygote. |
| This process leads to fertilization. | This process leads to formation of seeds. |
| Pollen tube formation does not take place in pollination. | After pollination, pollen tube forms for fertilization to occur. |
| Pollination occurs in flowering plants. | Fertilization occurs in every living beings which undergo sexual reproduction. |
The site of fertilisation in the flower is the ovule present in the ovary.
The product of fertilisation of male and female gamete is the zygote.
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संबंधित प्रश्न
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
Explain the ovarian cycle with its different phases.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Ovulation is the release of the ovum from the Graafian follicle.
(R) - It occurs during the follicular phase of the menstrual cycle.
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Explain the changes that occur in the uterus simultaneously in anticipation.
Match the Columns.
| Column I | Column II | ||
| i. | Proliferative phase | a. | Breakdown of the endometrial lining |
| ii. | Secretory phase | b. | Follicular phase |
| iii. | Menstruation | c. | Luteal phase |
In the absence of fertilization, corpus luteum ____________.
Which one of the following statements is incorrect about menstruation?
A human female reaches menopause aroung the age of ______.
Hormones responsible for menstrual cycle are produced from ______.
Exit from the cell cycle and remain dormant for long time by a cell is represented by one of the following phases of the cell cycle:
Why are menstrual cycles absent during pregnancy?
Which of the following statement is correct?
Spermatogenesis is induced by ______.
Write a short note on Secretory Phase.
Give a reason for the following:
The second half of the menstrual cycle is called the luteal phase as well as the secretory phase.
The enlarged mature follicle bursts to release the egg.
Which of the following organs primarily undergo cyclic changes during the menstrual cycle?
