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Yogita Ingle 5 years, 4 months ago (2577571)
- The arrangement of ovules within the ovary is known as placentation.
- The placentation is of different types namely, marginal, axile, parietal, basal, central and free central.
- In marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows. Example- pea
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Yogita Ingle 5 years, 4 months ago (2577571)
Electron gain enthalphy for oxygen is negative because oxygen being an electronegative atom can easily accept electron.
But gaining one more electron to O2 will mean much more stability,so it is be an exothermic reaction.This expectation is true if we consider a neutral species but as O− is negligibely charged adding another negativelly charged species will be diffcult as the like charges will repel each other ,so in order to force the electronn to fuse with O− ion we supply energy in form of heat .This males it endothermic.
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Yogita Ingle 5 years, 4 months ago (2577571)
It is difficult to pull out the husk of a coconut tree because it is made up of sclerenchyma tissues which are dead cells. This gives rigidity and stiffness.

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Anand Jeena 5 years, 4 months ago (9299671)
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