Which one of the following provides abundant reserve food materials f…

The correct answer is Option (4) → Nucellus

The nucellus is the mass of cells enclosed within the integuments of the ovule. Its cells hold abundant reserve food materials, and the embryo sac (female gametophyte) lies inside it, so the nucellus is the food store around the developing embryo sac.

Option (1) Ovary — Incorrect. The ovary is the basal bulged part of the pistil that contains the ovules. It is not the food-storing tissue around the embryo sac.

Option (2) Micropyle — Incorrect. The micropyle is only a small opening at the tip of the ovule where the integuments do not meet. It stores no food.

Option (3) Integuments — Incorrect. The integuments are one or two protective envelopes of the ovule. They protect, and later harden into the seed coat; they are not the reserve food tissue.

Option (4) Nucellus — Correct. The cells of the nucellus have abundant reserve food materials, and the embryo sac is located in the nucellus.

NCERT Extract:
The Pistil, Megasporangium (Ovule) and Embryo Sac – “… Each ovule has one or two protective envelopes called integuments. Integuments encircle the nucellus except at the tip where a small opening called the micropyle is organised. Opposite the micropylar end, is the chalaza, representing the basal part of the ovule. Enclosed within the integuments is a mass of cells called the nucellus. Cells of the nucellus have abundant reserve food materials. Located in the nucellus is the embryo sac or female gametophyte.”