Question

Choose the correct answers from the alternative given
A. The perisperm is remaining
B. Nucellus
C. Endosperm
D. Female gametophyte
E. Integument

Answer 1

Hint: Nucellus which is nutritive tissue present in Embryos that nourishes developing egg cells.

Step by step answer:Some tissues of the parent body plant do not degenerate and are meant for providing nutrition to developing seed. The Perisperm nutritive tissue of seed derived from the nucellus and deposited externally to the embryo sac distinguished from the endosperm. A layer of nutritive tissue in the seed of certain flowering plants that are derived from the nucellus and surrounds the embryo. In seeds of some plants remnants of nucellus are persistent.
In gymnosperms, three of the four haploid spores produced in meiosis typically degenerate, leaving one surviving megaspore inside the nucellus. The presence of perisperm is an adaptive feature that helps the seed to procure its food until the seedling develops and becomes able to photosynthesis. The reserve nutritive tissue in a seed used by the embryo in sprouting.
However, it forms from the nucellus and has a diploid, and not triploid, chromosomal set. In addition, it lacks proteins and contains chiefly starch and, less commonly, fat. Perisperm characterizes plants of the families Caryophyllaceae, and Zingiberaceae, Piperaceae, and Nymphaeaceae. Among gymnosperms, it is found in Genetics and Taxaceae. The perisperm constitutes all or part of the reserve tissue.
When it forms only part of the seed’s reserve, it develops parallel with the endosperm.
Hence option A is correct.

Note: The nucellus gives rise to megaspore mother cells which later undergoes reductional division of the female gametophyte. Seeds having perisperm for nutrition are known as perisperm seed.