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प्रश्न
Differentiate between outbreeding and outcrossing.
उत्तर
| Outbreeding | Outcrossing |
| It is the mating of unrelated or distantly related individuals of a species. |
It is the mating between those animals that are of the same breed, but do not share common ancestry since 4 to 5 generations.
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संबंधित प्रश्न
'Formation of primary endosperm nucleus is called triple fusion'. Give reason
Why do you think the zygote is dormant for sometime in a fertilised ovule?
Read the following statement and answer the questions that follow :
"A guava fruit has 200 viable seeds."
(a) What are viable seeds?
(b) Write the total number of :
(i) Pollen grains (ii) Gametes
in producing 200 viable guava seeds.
c) Prepare a flow-chart to depict the post-pollination events leading to viable-seed production in a flowering plant.
Explain the following term:
Elephophily
What happens to the following after fertilization?
Ovules
What happens to the following after fertilization?
Petals
What happens to the following after fertilization?
Stamens
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:
Name the parts labelled 1, 2, 3, 4 and 5.
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 happens to the part labelled '5' during the process?
Even though each pollen grain has 2 male gametes, why at least 20 pollen grains are required to fertilize 20 ovules in a particular carpel?
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.
Name the cell which divides to form male nuclei.
What is polyembryony? How it can commercially exploited.
Which of the following happens during triple fusion?
In angiosperms, for formation of which of the following triple fusion is necessary?
Double fertilization was first discovered by Nawaschin (1898) in ______.
______ have the smallest seeds in the plant kingdom.
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.
Name the part of gynoecium that determines the compatible nature of pollen.
