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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.
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
Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.
'A proper understanding of the menstrual cycle can help immensely in family planning.' Do you agree with the statement? Provide reasons for your answer.
Name the Following
Sloughing of the uterine wall during menstrual flow.
Mainly which type of hormones control the menstrual cycle in human beings?
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
Subject 2 has a higher level of hormone B, which is ______
Hormones responsible for menstrual cycle are produced from ______.
Complete the table:
| Number | Type | No. of pairs | Region |
| C1C8 | Cervical | ______ | Neck |
| T1T12 | ______ | 12 pairs | ______ |
| L1L5 | Lumbar | ______ | Lower back |
| S1S5 | ______ | 5 pairs | ______ |
| CO1 | Coccygeal | ______ | ______ |
Given below is the diagram depicting the menstrual cycle in human beings. Study it carefully and answer the questions that follow.
- Which phases are indicated by ‘C’ and ‘D’?
- Name the structures labelled ‘F’. What is its role?
- Explain the changes in the level of progesterone during phases ‘C’ and ‘D’.
- Which hormone present in the urine confirms pregnancy in human beings?
- Identify the structure labelled ‘E’. Name the hormone released by it.
The enlarged mature follicle bursts to release the egg.
Name the following:
Two layers of the wall of uterus.
