Question

Embryo sac is to ovule as ……is to an anther
(a)Stamen
(b)Filament
(c)Pollen grain
(d)Androecium

Answer 1

Hint: An ovary may have many ovules. Each ovule has an embryo sac, which in turn has a single egg cell. The anther is the fertile portion of the stamen. It has two similar halves, and each half consists of two lobes. Each lobe contains a pollen sac or microsporangium, which in turn consists of male gametes.

Complete answer:
In a majority of angiosperms, Each stamen consists of a bilobed structure called the anther. Each anther lobe contains a pollen sac or microsporangium. Which in turn consists of pollen grains. The androecium is the male reproductive organ of a flower. It is composed of individual units called stamens. Stamens are comparable to microsporophylls of gymnosperms. A stamen has three parts; filament, anther, and connective. The filament is the slender stalk of the stamen., and it terminally bears the anther. The anther is the fertile portion of the stamen. The gynoecium is the female reproductive part of the flower. The individual unit of gynoecium is carpels. It has three parts; stigma, style, and ovary.

Additional Information: -Ovary is the swollen basal part of the carpel. Style is the slender middle part, and stigma is the flat terminal part.
-Ovary may contain many ovules. Each ovule has an embryo sac. Each embryo sac has a single egg cell. Each ovule is connected to the ovary by a short stalk called a funicle.
-The point of attachment of the funicle to the ovule is called hilum. At the point of attachment of the funicle to the ovary, there is a cushion-like tissue called the placenta, from which the ovule develops.
so, the correct answer is ‘pollen grains’

Note: -Stigma receives pollen grains during pollination. Style holds stigma in the correct position for this purpose. In some flowers, stigma secretes a sticky fluid which promotes pollen germination.
-Those filaments which do not bear anthers at their tips are called staminodes.
-In some cases, stamens are expanded and attractive. They are called petaloid stamens. Stamens may be arranged spirally or concentrically in whorls. In some flowers, they are arranged in many whorls and in others in one or two whorls.