Match the following column I and column II based on the type of endosperm found in the case of the respective plants.
Column I
Column II
A.
Jimson weed
(i)
Nuclear endosperm
B.
Helianthus annuus
(ii)
Cellular endosperm
C.
Eremurus
(iii)
Endosperm consumed
D
Arachis hypogaea
(iv)
Helobial endosperm
Match the following column I and column II based on the type of endosperm found in the case of the respective plants.
| Column I | Column II | ||
| A. | Jimson weed | (i) | Nuclear endosperm |
| B. | Helianthus annuus | (ii) | Cellular endosperm |
| C. | Eremurus | (iii) | Endosperm consumed |
| D | Arachis hypogaea | (iv) | Helobial endosperm |
The correct option is B A→(ii), B→(i), C→(iv), D→(iii)
During sexual reproduction in flowering plants, when one haploid male gamete fuses with the 2 haploid polar nuclei of the embryo sac, it gives rise to a triploid tissue known as the primary endosperm nucleus (PEN). PEN further undergoes division to form the endosperm. The endosperm is the main source of nutrition for the embryo. Endosperm development may take place in 3 types- nuclear, cellular and helobial type.
In the cellular type of endosperm development, the first division of PEN is followed by cytokinesis. It is not very common. Further divisions are similar which lead to the formation of the cellular endosperm. E.g:- Balsam, Petunia, Datura (Jimson weed).
In nuclear type endosperm development, the PEN divides repeatedly without cytokinesis. E.g:- maize, rice, wheat, cotton, sunflower (Helianthus annuus).
The endosperm is completely consumed by the developing embryo before the maturation of the seed. E.g:- pea, ground nut (Arachis hypogaea), orchids, beans.
The endosperm is persistent in the mature seed and is used up during seed germination. E.g:- castor (Ricinus communis), coconut.
During sexual reproduction in flowering plants, when one haploid male gamete fuses with the 2 haploid polar nuclei of the embryo sac, it gives rise to a triploid tissue known as the primary endosperm nucleus (PEN). PEN further undergoes division to form the endosperm. The endosperm is the main source of nutrition for the embryo. Endosperm development may take place in 3 types- nuclear, cellular and helobial type.
In the cellular type of endosperm development, the first division of PEN is followed by cytokinesis. It is not very common. Further divisions are similar which lead to the formation of the cellular endosperm. E.g:- Balsam, Petunia, Datura (Jimson weed).
In nuclear type endosperm development, the PEN divides repeatedly without cytokinesis. E.g:- maize, rice, wheat, cotton, sunflower (Helianthus annuus).
The endosperm is completely consumed by the developing embryo before the maturation of the seed. E.g:- pea, ground nut (Arachis hypogaea), orchids, beans.
The endosperm is persistent in the mature seed and is used up during seed germination. E.g:- castor (Ricinus communis), coconut.
