(a) The rate of photosynthesis continues to rise as long as the intensity of light rises.
(b) The outside atmospheric temperature has no effect on the rate of photosynthesis.
(c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesize in bright sunshine.
(d) Destarching of the leaves of a potted plant can occur only at night.
(e) The starting point of carbon cycle is the release of CO2 by animals during respiration.
(f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur.
(g) Photosynthesis is considered as a process supporting all life on earth.
Solution :
- The rate of photosynthesis continues to rise as long as the intensity of light rises.
Answer : false
The rate of photosynthesis increases with the intensity of light but upto a certain limit after that it gets fixed at that certain point .
- The outside atmospheric temperature has no effect on the rate of photosynthesis
Answer : false
Outside temperature effects the rate of photosynthesis . With the increase in temperature the rate of photosynthesis also increases . This rise occurs up to the maximum temperature of 35°C , after which falls and stops above 40 Co.
- If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesize in bright sunshine
Answer : false
For rate of photosynthesis temperature is a necessary factor . Even in presence of bright sunlight ice cold water will hamper the rate of photosynthesis in the leaf .
- The starting point of carbon cycle is the release of CO2 by animals during respiration
Answer : false
For the experiment of photosynthesis the plant which is used should be placed in dark for 24 to 48 hours only . During this time period the starch will be removed from the leaves and will be stored in the storage organs .
- The starting point of carbon cycle is the release of CO2 by animals during respiration
Answer : false
There is no starting and ending point of carbon cycle . In the atmosphere carbon is
present by respiration and combustion .
- If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur.
Answer : false
If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will continue to occur , because the reaction is not dependent of light .
- Photosynthesis is considered as a process supporting all life on earth.
Answer : true
Photosynthesis is the source of food and energy for all living organisms . For animals it is directly and for human beings it is indirectly . Thus we can say that photosynthesis is considered as a process supporting all life on earth.