Asking 2nd time:
Q 20.
20. (i) Name the parts lebelled as A, B, C and D in the diagram given below :
(ii) What is pollution ? State its significance .
(iii) How does fertilisation occur in flowers ?
(iii) How does fertilisation occur in flowers ?
Dear student,
Please find below the solution to the asked query
i. A. Pollen grain on the stigma
B. Pollen tube
C. Ovary
D. Ovule
ii. The process of transfer of the pollen from the anther to the stigma is known as pollination.
Please find below the solution to the asked query
i. A. Pollen grain on the stigma
B. Pollen tube
C. Ovary
D. Ovule
ii. The process of transfer of the pollen from the anther to the stigma is known as pollination.
- Pollination is very important as it is the mean of sexual reproduction in flowering plants.
- Plants can not complete their life cycle without pollination.
- Without pollination, plants will not be able to produce more offsprings. Animals depend on the plants for their food. If there are less or no plants, animals will also have to starve.
In flowering plants during fertilization, pollens from male flower are dropped on the stigma of a female flower. Inside the pollen grain, two pollen nuclei (male gametes) are formed which gradually enter inside the ovule through pollen tube. Out of the two sperm nucleus, one sperm nucleus fuses with the egg nucleus to form a zygote (the process is called syngamy) and another fuses with polar nuclei to form endosperm (the process is called triple fusion). Since two kinds of fusion—syngamy and triple fusion—take place, the process is known as double fertilization.
The zygote finally develops into embryo.
Ovule develops into seeds while ovary develops into fruit after fertilization
Hope this information will clear your doubts about the topic.
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