please give me all questions answer Q-13 to 19
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13)a.. one reason is DNA copying can make errors ... the other one is there are two gametes involved ... that is female and male ..the characters are inherited from both the parents ...so there will some variations...
b..I) pollen grains
ii)it reaches the stigma through various agents like wind ..water ..air ...
iii)pollen tube ..through which the pollen grains travel to the ovary..
iv)after fertilization is over the ovule becomes the seed
14)Disadvantages of burning fossil fuel are:-
1. It cause pollution, burning of fossil fuel release a large amount of harmful gases like carbon dioxide and carbon monoxide, which are the main cause of global warming.
2. Fossil fuels are non-renewable, excessive burning of these cause there depletion that cannot be refilled.
3. Extraction of fossil fuel is very difficult and dangerous, that also cause health hazards.
16) causes for myopia
is excessive curvature and elongation of eye ball
b..I) pollen grains
ii)it reaches the stigma through various agents like wind ..water ..air ...
iii)pollen tube ..through which the pollen grains travel to the ovary..
iv)after fertilization is over the ovule becomes the seed
14)Disadvantages of burning fossil fuel are:-
1. It cause pollution, burning of fossil fuel release a large amount of harmful gases like carbon dioxide and carbon monoxide, which are the main cause of global warming.
2. Fossil fuels are non-renewable, excessive burning of these cause there depletion that cannot be refilled.
3. Extraction of fossil fuel is very difficult and dangerous, that also cause health hazards.
16) causes for myopia
is excessive curvature and elongation of eye ball
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