Home
Class 12
BIOLOGY
a) Describe the endosperm development in...

a) Describe the endosperm development in coconut.
b) Why is tender coconut considered a healthy source of nutrition?
c) How are pea seeds different from castor seeds with respect to endosperm?

Text Solution

Verified by Experts

a) Endosperm formation, there are three types:
i) Nuclear endosperm formation, repeated free nuclear division takes place, referred to as liquid endopserm. Ex-coconut water.
ii) Cellular endosperm formation: Here, a cell-wall formation is co-incident with nuclei divisons. Acoracease has cellular endosperm development while other monocots are helobial.
iii) Helobial endosperm: Here, cell wall is laid between the first nuclei after which one half develops into nuclear endosperms and the other half along the cellular pattern as in coconut.
b) Coconut water is considered as a 'fluid of life' It increases immunity. Tender coconut water is a good source of 'Laceric acid'.
Pea seed: Here, the endosperm is completely consumed by the developing embryo before seed maturation.
Castor: Here, the endosperm persists in the nature seed and used up during seed germination.
Promotional Banner

Similar Questions

Explore conceptually related problems

a) Describe the endosperm development in coconut. b) Why is tender coconut considered a healthy source of nutrition? c) How are pea seeds different from castor sees with respect to endosperm?

Banana is a parthenocarpic fruit where oranges show polyembryony. How are they different from each other with respect to seeds?

The coconut water from tender coconut is endosperm and the surrounding white kernel is the endospem.

Describe double circulation in human beings. (a) Why is it necessary ? (b) How are arteries different from veins ?

a) Why does endosperm development precede development in angiosperm seeds? State the role of endosperm in mature albuminous seeds. b) Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.

Answer the following questions based on Meselson and Stahl s experiment: (a) Write the name of the chemical substance used as a source of nitrogen in the experiment by them. (b) Why did the scientists synthesise the light and the heavy DNA molecules In the organism used in the experiment ? (c) How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule ? Explain. ((1) Write the conclusion the scientists arrived at after completing the experiment.

Name the cell from which the endosperm of coconut develops. Give the characteristic features of endosperm of coconut

Mango and coconut are drupe fruits. They develop from monocarpellary superior ovaries and are one seeded. It is differentiated inot outer thin epicarp, middle fleshy mesocarp and inner stony endocarp . The edible part of coconut (Cocos nucifera) is endosperm . The milk of tender coconut represents the oily endosperm in liquid form. Later it gets deposited along the walls of endocrap and forms edible flesh.

Consider the following statements? (a) Before birth, foramen ovale allows the blood to pass from right atrium to left atrium , thus bypassing the pulmonary circulation , (b) Heart is protected by a double walled pericardium , (c) The muscle fibres present in heart are different from smooth muscles in being mesodermal in origin , (d) Nodal tissues like AVN, SAN are specialised neural tissues which are distributed in heart. How many among the statements mentioned above are correct?