4. Complete the following
SCOA
(a) Carbon dioxide +
+ Oxygen
(b) Carbon dioxide is obtained from
is present in
c
→ Leaves
is obtained from
(d) Sunlight
Answers
Answer:
Question 1:
If a new organism is discovered and it is found that it can make food for itself from simple non-living substances found in nature, what will you classify it as–an autotroph or a heterotroph? Give reasons.
ANSWER:
An organism that can prepare its food from simple non-living substances will be classified as an autotroph. This is because autotrophic organisms are those organisms which can use simple non-living substances (such as carbon dioxide and water) to produce their own food. These organism can obtain energy for this process through sunlight or chemicals.
Question 2:
The absence of which of these will not affect photosynthesis–oxygen, carbon dioxide, water, chlorophyll, light? Give reasons.
ANSWER:
The absence of oxygen will have no effect on the process of photosynthesis. This is because the photosynthetic process utilises water and carbon dioxide to produce oxygen and carbohydrate in the presence of chlorophyll and sunlight. Thus, oxygen is a product of photosynthesis and is not required for photosynthesis.
Question 3:
Do you expect the intensity of light to affect the rate of photosynthesis?
ANSWER:
Yes, the intensity of light has a direct affect on the rate of photosynthesis. The chlorophyll molecules that are essential for photosynthesis require a certain intensity of light to perform maximum rate of photosynthesis. Thus, light intensity will certainly affect the photosynthesis rate.