The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because (a) starch is immediate product of photosynthesis (b) glucose formed in photosynthesis soon gets converted into starch (c) starch is soluble in water (d) sugar cannot be used

The number of water molecules required in the chemical reactions to produce one molecule of glucose during photosynthesis is (a) six (b) twelve (c) eighteen (d) twenty-four

The rate of photosynthesis is not affected by (a) light intensity (b) humidity (c) temperature (d) CO₂ concentration

Chlorophyll in a leaf is required for (a) breaking down water into hydrogen and oxygen (b) emitting green light (c) trapping light energy (d) storing starch in the leaves

If the rate of respiration becomes more than the rate of photosynthesis, plants will:

continue to live, but will not be able to store food (b) be killed instantly (c) grow more vigorously because more energy will be available (d) stop growing and die gradually of starvation

Which one chemical reaction occurs during photosynthesis?

Carbon dioxide is reduced and water is oxidised (b) Water is reduced and carbon dioxide is oxidised (c) Both carbon dioxide and water are oxidised (d) Both carbon dioxide and water are reduced

The specific function of light energy in the process of photosynthesis is to (a) reduce carbon dioxide (b) synthesise glucose (c) activate chlorophyll (d) split water molecule

A plant is kept in a dark cupboard for 48 hours before conducting any experiment on photosynthesis in order to (a) remove chlorophyll from leaves (b) remove starch from the leaves (c) ensure that no photosynthesis occurred (d) ensure that the leaves are free from starch

During photosynthesis, the oxygen in glucose comes from

CO₂ (b) water (c) both CO₂ and water (d) oxygen via air