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प्रश्न
Explain the pollination process in Salvia
उत्तर
Pollination in Salvia - Insects bring about pollination in Salvia. Flowers of Salvia have corolla whose upper part is blipped and Iower part is tubular where two stamens are attached. Upper lip forms a hood like structure while lower lip serves as a landing platform for insects. Of the two stamens, the fertile one is situated under the hood like upper lip of corolla. When an insect sits on the lower lip and pushes its proboscis into the corolla tube for collecting nectar, its back touches the fertile anther, which gets dusted with pollen grains. When this insect visits another flower for nectar, the style bends down and touches the back of the insect, as a result pollination occurs.
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संबंधित प्रश्न
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.
Match the items in Column A with those in Column B.
|
Column A |
Column B |
|
(a) Generative nucleus |
(i) Pollen tube |
|
(b) Germ pore |
(ii) Endosperm nucleus |
|
(c) Exine |
(iii) Testa |
|
(d) Secondary nucleus |
(iv) Fertilization |
|
(e) Integument |
(v) Male nuclei |
|
(f) Egg nucleus |
(vi) Rough |
Name of the part of the ovary which gives rise to:
Seed ______
What happens to the following after fertilization?
Ovules
Given ahead is a diagrammatic representation of the process of fertilization. Study the same and then answer the question that follows:
What is the function of the synergids?
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?
In angiosperms, for formation of which of the following triple fusion is necessary?
Fusion of one of the male gametes with egg nucleus is referred to as ______.
All the events from pollen deposition on the stigma until pollen tubes enter the ovules are together referred to as ______.
Name the nuclei involved in triple fusion.
