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प्रश्न
Write a short note on Heterostyly.
उत्तर
Heterostyly: Some plants produce two or three different forms of flowers that are different in their length of stamens and style. Pollination will take place only between organs of the same length.
E.g: Primula.
संबंधित प्रश्न
Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.
What happens to the following after fertilization?
Petals
What are the advantages of the following in the flower to the plant concerned?
Smooth and light pollen
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
What is the function of the part labelled '4'?
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
What part does the stigma play in the process of fertilisation?
Expand the following abbreviation IW.
Explain the pollination process in Salvia
What happens to the ovary post fertilization?
Long Answer Question:
Draw a labeled diagram of the L.S. of anatropous ovule and list the components of the embryo sac and mention their fate after fertilization.
Give any four points of significance of double fertilization.
Male gametes in angiosperms are formed by the division of ______.
Which of the following represent megagametophyte
Define triple fusion.
Write a short note on Pollen kitt.
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
By which of the following double fertilization is exhibited?
From the following identify the fate of the male gametes discharged in the synergid.
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.
Which is the triploid tissue in a fertilised ovule? How is the triploid condition achieved?
