What is global warming? On what does it depend?

Question

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Answer

Global warming is increased temperature of the earth. During past century, the temperature of the
Earth has increased by $0.6 ^\circ C,$ most of it during last three decades.
This is mainly caused by greenhouse effect.
Global warming depends upon the amount of $CO_2$ and other greenhouse gases present in the atmosphere.
An increase in $CO_2$ concentration increases earth’s temperature by retaining more heat.
Carbon dioxide increases temperature by about $50\%, \text{CFCs}$ increase it by $20\%$ and methane increases it by $15\%$ whereas other pollutants increase it by $10\%.$
Atmospheric air pollution, industrialization and greenhouse effect cause global warming.

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Column A	Column B
(1) Nutritive tissue of embryo	(a) Perisperm
(2) Remnants of nucellus in seed	(b) Cotyledon
(3) Nutritive tissue of developing microspores	(c) Endosperm
(4) First photosynthetic organ of embryo	(d) Tapetum

wBCs	%	Nucleus	Function
Neutrophils	70%		________________________
________	________	Twisted	Secretes heparin, histamine and serotonin
Fosinophils	________	________	Antihistamin / Antiallergic in function
Manocytes	3-5%	________	________________________
________	________	________	Responsible for cell mediated as well as humoral immunity

Column A (Adaptation)	Column B (Type of pollination)
(1) Sticky, spiny pollen grains non-fragrant flowers	(a) Anemophily
(2) Feathery stigma and versatile anther	(b) Chiropterophily
(3) Presence of nectar glands and sweet smell	(c) Ornithophily
(4) Dull coloured flowers with strong fragrance	(d) Entomophily