(a) Trace the development of an endosperm after fertilisation with reference to coconut. Mention the importance of endosperm development.

(b) Write the importance of 'pollen bank'. [3]

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Solution

(a) In coconut, the primary endosperm nucleus (PEN) undergoes successive nuclear divisions to give rise to free nuclear endosperm known as coconut water. White kernel is the cellular endosperm. The endosperm provides nourishment to the growing embryo. [2]

(b) Pollen banks are used for storage or cryopreservation of pollen so that they could be used in crop breeding programmes. [1]

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Q. (a) Trace the development of an endosperm after fertilisation with reference to coconut. Mention the importance of endosperm development.

(b) Write the importance of 'pollen bank'. [3]

Q. Describe the development of endosperm after double fertilisation in an angiosperm. Why does endosperm development precede that of zygote? [3]

Q. Embryo develops first after double fertilisation, followed by the endosperm development.

In some seeds, the endosperm formed as a result of double fertilisation, is a food storing tissue. Coconut water is the liquid reservoir of nutrients (liquid endosperm) that nourishes the young coconut for a year or more of its life, delivering vital nutrients for sustained development of the solid endosperm (coconut meat) found inside the fruit.

Q. Describe endosperm development in coconut.

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(a) Trace the development of an endosperm after fertilisation with reference to coconut. Mention the importance of endosperm development. (b) Write the importance of 'pollen bank'. [3]

(a) Trace the development of an endosperm after fertilisation with reference to coconut. Mention the importance of endosperm development.

(b) Write the importance of 'pollen bank'. [3]