Question

In albuminous seed, food is stored in _____ and in exalbuminous seed, food is stored in _____
a. Endosperms, cotyledons
b. Cotyledons, cotyledons
c. Cotyledons, endosperm
d. Endosperm, endosperm

Answer 1

Hint: Most of the Angiosperms fertilization includes two major events of the fusion that are syngamy and triple fusion. The triploid product of the triple fusion develops into a specific structure whose presence and absence in mature seeds decides the albuminous and exalbuminous type of seed.

Complete answer:
Triple fusion refers to the fusion of diploid secondary nucleus and haploid male gamete. This event of triple fusion which is half part of double fertilization gives rise to triploid primary endosperm nucleus which later develops into Endosperm in developing embryos.

The endosperm is a nutritive tissue that nourishes the developing embryo. The albuminous seed has a persistent endosperm whereas in exalbuminous seeds the endosperm gets completely used up.

In exalbuminous seed, the main nutrient reservoir is cotyledons. Cotyledons are the specific region of the embryo which possess nutritive function during germination.

The example of albuminous seeds is maize, barley, castor, wheat, and sunflower whereas albuminous or non-endospermic seeds are found in pea, gram, etc.

Hence, The correct answer is option (A).

Additional information:
All the flowering plants are categorized into two groups, monocotyledoneae, and dicotyledoneae. In dicotyledons have two cotyledons whereas monocotyledons have one cotyledon. These are further subdivided into four categories based on the presence or absence of endosperm as reserve food material.

Note: Seeds have their reserve food in the form of the endosperm. Endosperms having seeds are called albuminous seeds and non-endospermic seeds are called exalbuminous seeds that use cotyledons as food material for germination. In albuminous seeds not only endosperm but also cotyledons are present.