Coir (Etymological origin: from Tamil and Malayalam - kayar - cord) is a coarse fibre extracted from the fibrous outer shell of a coconut. Coir fibres are found between the husk and the outer shell of a coconut. The individual fibre cells are narrow and hollow, with thick walls made of cellulose. They are pale when immature but later become hardened and yellowed as a layer of lignin is deposited on their walls.

Correct Option: B

Coir (Etymological origin: from Tamil and Malayalam - kayar - cord) is a coarse fibre extracted from the fibrous outer shell of a coconut. Coir fibres are found between the husk and the outer shell of a coconut. The individual fibre cells are narrow and hollow, with thick walls made of cellulose. They are pale when immature but later become hardened and yellowed as a layer of lignin is deposited on their walls.

The fruit is a mature or ripened ovary. When a fruit develops exclusively from the ovary, it is said to be true fruit. When in addition to the ovary, some other floral part also participates in the formation of fruits, then it is known as false fruit. Apple, pear, cashewnut, mulberry etc. are all false fruits.

Correct Option: D

The fruit is a mature or ripened ovary. When a fruit develops exclusively from the ovary, it is said to be true fruit. When in addition to the ovary, some other floral part also participates in the formation of fruits, then it is known as false fruit. Apple, pear, cashewnut, mulberry etc. are all false fruits.

Oryza sativa is rice. Ricinus communis is castor, a source of castor oil that acts as a purgative. Manihot is the scientific name for tapioca, a tuber rich in starch. Hibiscus esculentus is okra (bhindi).

Correct Option: B

Oryza sativa is rice. Ricinus communis is castor, a source of castor oil that acts as a purgative. Manihot is the scientific name for tapioca, a tuber rich in starch. Hibiscus esculentus is okra (bhindi).

Sunflower is a dicotyledonous plant. Hence its embryo has two cotyledons. Plants like maize are monocotyledonous and hence have a single cotyledon in the embryo.

Correct Option: B

Sunflower is a dicotyledonous plant. Hence its embryo has two cotyledons. Plants like maize are monocotyledonous and hence have a single cotyledon in the embryo.

In guava, mesocarp and endocarp form the edible part. In maize seed coat is fused with fruit wall.

Correct Option: D

In guava, mesocarp and endocarp form the edible part. In maize seed coat is fused with fruit wall.