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प्रश्न
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
उत्तर
In gymnosperms, the ovules are exposed and the pollens are deposited directly on it. Hence the pollution is direct in a gymnosperm. Whereas in angiosperms it is said to be indirect, as the pollens are deposited on stigma or the pistil.
संबंधित प्रश्न
Give one word/term for the following:
When pollen grains of a flower reach the stigma of the same flower.
What happens to the following after fertilization?
Ovules
What is the function of the pollen tube? Explain it with the help of a diagram.
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
Name the parts labelled 1, 2, 3, 4, 5 and 6.
Name the scientists who have contributed to the following:
Discovered double fertilization.
What is the significance of the dispersal of seeds? Give any two points.
Explain the pollination process in maize.
What is the function of pollen tube? Explain with the help of a diagram.
The correct order of haploid, diploid, and triploid structure in fertilized embryo sac is
In Haplopappus gracilis, number of chromosomes in cells of nucellus is 4. What will be the chromosome number in Primary endosperm cell?
Caruncle develops from
Name the cell which divides to form male nuclei.
What is Mellitophily?
The success of seed plants on land is mainly due to ______.
What would be the number of chromosomes in the megaspore mother cell of the plant if an endosperm of an angiosperm has 24 chromosomes?
Double fertilization and triple fusion were discovered by ______.
The total number of nuclei involved in double fertilisation in angiospersm are ______.
After fertilization, the seed coat of seeds develops from ______
Find out the CORRECT sequence of events taking place in pollen - pistil interaction.
- Pollen tube enters one of the synergids and bursts to release male gametes.
- Pollen tube enters the ovule through the micropyle of the ovary.
- The pollen tube grows through the stigmatic tissue and then style.
- Pistil recognizes the correct pollen and accepts it.
What is Siphonogamy?
