Question

Q.No.3 Match the Columns. (2)

Column A Column B

1) Nutritive tissue of embryo a) perisperm

2) Remnants of nucellus in seed b) cotyledon

3) Nutritive tissue of developing microspores c) Endosperm

4) First photosynthetic organ of embryo d) Tapetum​

Answer 1

Nutritive tissue of embryo - Endosperm

• The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization.

• It is triploid (meaning three chromosomes sets per nucleus) in most species.

• It surrounds embryo and provides nutrition in the form of starch, though it can also contain oils and proteins.

Remnants of nucellus in seed - perisperm

• The nucellus (the central part of an ovule,containing the embryo sac) is generally used up during the development of embryo but in some cases it remains outside the endosperm in the form of a thin layer, called perisperm

Nutritive tissue of developing microspores - Tapetum

• The tapetum is the innermost wall layer of the microsporangium of the anther of flowering plants and is the tissue in closest contact with the developing pollen grains.

First photosynthetic organ of embryo - Cotyledon

• Cotyledon is a significant part of the embryo within the seed of the plant and is defined as embryonic leaf in seed-bearing plants,one or more of which are the first to appear from a germinating seed.

• They become established as a photosynthetic organ and may act as a nutritional reserves themselves or may aid the embryo in metabolizing nutrition, stored elsewhere in the seed.