Photosynthesis in Higher Plants PPT Biology Class 11

 Page 1


PHOTOSYNTHESIS IN
HIGHER PLANTS
Page 2


PHOTOSYNTHESIS IN
HIGHER PLANTS
Page 3


PHOTOSYNTHESIS IN
HIGHER PLANTS
PHOTOSYNTHESIS IN HIGHER
PLANTS
Green plants carry out ‘photosynthesis’, a physico-chemical
process by which they use light energy to drive the synthesis
of organic compounds
Importance of photosynthesis includes:
1.Primary source of food 
2.Release O2 to atmosphere
Ultimately, all living forms on earth depend on sunlight for
energy. 
Page 4


PHOTOSYNTHESIS IN
HIGHER PLANTS
PHOTOSYNTHESIS IN HIGHER
PLANTS
Green plants carry out ‘photosynthesis’, a physico-chemical
process by which they use light energy to drive the synthesis
of organic compounds
Importance of photosynthesis includes:
1.Primary source of food 
2.Release O2 to atmosphere
Ultimately, all living forms on earth depend on sunlight for
energy. 
EARLY EXPERIMENTS
Joseph Priestley (1733-1804) in 1770 performed a series
of experiments that revealed the
        essential role of air in the growth of green plants.
Priestley observed that a candle burning in a closed
space – a bell jar, soon gets extinguished. Similarly, a
mouse would soon suffocate in a closed space
when he placed a mint plant in the same bell jar, he
found that the mouse stayed alive and the candle
        continued to burn
Priestley hypothesised as follows: 
        Plants restore to the air whatever breathing animals and 
        burning candles remove.   
Page 5


PHOTOSYNTHESIS IN
HIGHER PLANTS
PHOTOSYNTHESIS IN HIGHER
PLANTS
Green plants carry out ‘photosynthesis’, a physico-chemical
process by which they use light energy to drive the synthesis
of organic compounds
Importance of photosynthesis includes:
1.Primary source of food 
2.Release O2 to atmosphere
Ultimately, all living forms on earth depend on sunlight for
energy. 
EARLY EXPERIMENTS
Joseph Priestley (1733-1804) in 1770 performed a series
of experiments that revealed the
        essential role of air in the growth of green plants.
Priestley observed that a candle burning in a closed
space – a bell jar, soon gets extinguished. Similarly, a
mouse would soon suffocate in a closed space
when he placed a mint plant in the same bell jar, he
found that the mouse stayed alive and the candle
        continued to burn
Priestley hypothesised as follows: 
        Plants restore to the air whatever breathing animals and 
        burning candles remove.   
Priestley’s experiment