Question

Read the following statements and find out the incorrect statements.

a. The placenta is located inside the locule. Arising from the placenta are the ovules.

b. The number of ovules in an ovary may be one (papaya, watermelon and orchids) to many (wheat, paddy and mango).
c. Each ovule has one or two protective envelopes called integuments.

d. Integuments encircle the ovule except at the tip where a small opening called the chalaza is organised. Opposite the chalaza is the micropylar end.

e. Enclosed within the integuments is a mass of cells called the perisperm.

• A. b, d and e
• B. a, b and d
• C. a, c and d
• D. b, c and e

Answer 1

The correct option is A b, d and e

Number of ovules in the ovary
The number of ovules in an ovary varies in angiosperms.

• Single ovule is seen in one-seeded fruits such as mango, wheat, paddy etc.
• Multiple ovules are seen in the ovaries of orchids, papaya, watermelon etc.

Hence, statement b is incorrect.

Micropylar end and chalazal end
Integuments surround the nucellus except at the tip. The tip has an opening called the micropyle. Opposite to the micropylar end lies the chalazal end which is located towards the base of the ovule.
Hence, statement d is incorrect.

Perisperm
A mass of cells called the nucellus is enclosed within the integuments. Nucellus is made up of parenchymatous cells and forms the main body of the ovule. It surrounds the embryo sac and provides nourishment to the developing embryo.
The perisperm is a nutritive tissue surrounding the embryo in seeds that develops from the nucellus of the ovule after fertilisation.
Hence, statement e is incorrect.


Final answer
a. b, d and e