Biology
Shivam dissected a flower of sweet pea and removed all the petals. He observed the reproductive parts of the flower (both male and female), arranged in a specific manner as shown in the diagram given below.
(a) Mention the kind of arrangement of the stamens as shown in the figure.
(b) What are the three kinds of petals that Shivam removed from the flower? Name them.
(c) Name the kind of pollination (on the basis of pollinating agent) with one specific feature of the flower which favours it.
Pollination
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Answer
(a) Diadelphous
(b) The standard (1), the wings (2) and the keel (formed by fusion of 2 petals).
(c) Entomophily (pollination by insects). The flowers pollinated by insects are brightly coloured and produce nectar.
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Related Questions
Given alongside is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the questions that follow:
(a) Name the parts labelled 1, 2, 3, 4 and 5.
(b) Where does the germination of the pollen grain take place and how?
(c) What is the function of the part labelled '4'?
(d) What happens to the part labelled '5' during the process?
Given below is a diagrammatic representation of the process of fertilization. Study the same and then answer the questions that follow:
(a) Name the parts labelled 1, 2, 3, 4, 5 and 6.
(b) What happens to (i) Ovary (ii) Ovule after fertilization?
(c) What is the function of the synergids?
(d) What part does the stigma play in the process of fertilization?
Assertion (A): Autogamy and allogamy are the two kinds of self-pollination.
Reason (R): Self-pollination occurs within the same flower or two flowers of the same plant.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Herkogamous flowers favour cross-pollination as these flowers have a structural barrier between the male and female reproductive parts.
Reason (R): Pansy is an example of a herkogamous flower which has a hood covering the stigma.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.