Biology
Assertion (A): Photosynthesis occurs in the cells of leaves which contain chloroplasts whereas respiration occurs in all other cells which lack chloroplasts.
Reason (R): The pigment chlorophyll traps solar energy for the process of photosynthesis whereas it does not participate in the process of respiration.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is false but R is true.
Reason — A is false as photosynthesis mainly occurs in green parts of plants (especially leaves) because they contain chloroplasts. However, respiration occurs in all living cells, including leaf cells, stem cells, root cells, etc. It is not limited to cells without chloroplasts.
R is true as chlorophyll is the green pigment in chloroplasts that absorbs (traps) solar energy for photosynthesis. It does not take part in respiration, which occurs in mitochondria.
Therefore, A is false but R is true is the correct option.
Related Questions
Assertion (A): The extensive network of veins within the leaf lamina supplies water and minerals in every cell and also helps in the translocation of prepared food to the other parts of the plant.
Reason (R): The flow of fluids in the veins of leaves or veins of our body, both are unidirectional.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): More energy is released (38 ATP) in the aerobic respiration as compared to anaerobic respiration during which only 2ATPs are produced by the breakdown of one molecule of glucose.
Reason (R): Complete oxidation of glucose occurs in presence of oxygen whereas glucose cannot be broken down completely in absence of oxygen. Hence, amount of energy produced varies between the two kinds of respiration.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Suppose we compare the leaf with a factory, match the items in Column A with those in Column B.
Sl.
No.Column A Column B 1. Cells in the leaf Raw materials 2. Chloroplast Power 3. Sunlight Machinery 4. Oxygen and water End product 5. Carbon dioxide and water By product 6. Glucose Work room State whether the following statements are True or False:
(i) Green plants prepare their food by using two raw materials, oxygen and water.
(ii) The chlorophyll enables the plants to use light energy.
(iii) The free oxygen in the atmospheric air is the result of photosynthesis.
(iv) Photosynthesis occurs only in chlorophyll-containing parts of the plant.