Question
Hard
Solving time: 4 mins
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
(i) What could have prevented the rest of the 40 ovules from maturing into viable seeds ? Explain giving a reason.
(ii) Describe the development of a dicot embryo in a viable seed.
(iii) Why certain angiospermic seeds are albuminous while others are ex-albuminous ? Explain.
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Text solutionVerified
(i) Less number of pollen grains / less number of male gametes were available / all pollen grains] did not germinate / all pollen grains did not form pollen tubes / many pollen were noncompatible / 40 ovules did not get fertilised / only 480 ovules were fertilised
(ii) Zygote divides (mitotically) to give rise to pro embryo, globular, heart shaped, mature embryo .
(iii) Albuminous : Endosperm is not completely used up during embryo development / residual endosperm found in the seed Ex-albuminous : Endosperm is completely consumed / no residual endosperm is left in seed.
(ii) Zygote divides (mitotically) to give rise to pro embryo, globular, heart shaped, mature embryo .
(iii) Albuminous : Endosperm is not completely used up during embryo development / residual endosperm found in the seed Ex-albuminous : Endosperm is completely consumed / no residual endosperm is left in seed.
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Question Text | A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds. (i) What could have prevented the rest of the 40 ovules from maturing into viable seeds ? Explain giving a reason. (ii) Describe the development of a dicot embryo in a viable seed. (iii) Why certain angiospermic seeds are albuminous while others are ex-albuminous ? Explain. |
Topic | Sexual Reproduction in Flowering Plants |
Subject | Biology |
Class | Class 12 |
Answer Type | Text solution:1 |
Upvotes | 145 |