Tag: sexual reproduction in plants

Cotton, seed-hair fibre (testa) of a variety of plants of the genus Gossypium, belonging to the Hibiscus or mallow, family (Malvaceae) and native to most subtropical parts of the world.
Cotton is a soft, fluffy staple fiber that grows in a boll, or protective capsule, around the seeds of cotton plants. The fiber is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds. So, fibres of Gosssypium are out growth of testa and not out growth of pericarp, pappus hair and bast fibres. 
Therefore, the correct answer is option C.

The seeds of Abrus precatorius are much valued in native jewelry for their bright coloration. Most beans are black and red, suggesting a ladybug, though other colors are available. Jewelry-making with jequirity seeds is dangerous and there have been cases of death by a finger-prick while boring the seeds for beadwork. The seeds were traditionally used to weigh jewellery in India. Seeds of Xanthium, Calotropis and Thespesia are not used as jeweler's weight. 
Therefore, the correct answer is option B.

Cotton is a soft, fluffy staple fiber that grows in a boll or protective capsule, around the seeds of cotton plants of the genus Gossypium in the family of Malvaceae. The fiber is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds. Cotton is a seed hair fiber produced from epidermal seed coat. Cotton fibers are not obtained from root hairs, stem hairs or leaf. 
Therefore, the correct answer is option D.

A fertilized, fully grown and ripened ovary forms a fruit. After the process of fertilization, the ovary swells up and develops into a fruit.
Thus, the correct answer is option (C), 'Only ovary'.

Seed is the ripened ovule or mature integumented megasporangium in which outer integument convert into testa and inner integument are grown up as tegmen and after fertilization, the embryo is placed inside seed in dormant state and grow into a new plant in favorable condition.

Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as aril. It is typically coloured, hairy and fleshy structure. It is edible in some of the species of plant. It helps in pollination as the insects gets attracted by its beautiful colour.

Endosperm develops after the formation of embryo. It functions as the nutritive tissue for the growing embryo. The endosperm is found as liquid (coconut water) and solid (coconut kernel, white fluffy part of maize). The endosperm found in maize is of nuclear type.