Question

Which of the following organisms fix the sun's radiant energy to make food from simple inorganic materials?
a. Plants
b. Photosynthetic bacteria
c. Chemosynthetic bacteria

• A. a, b and c
• B. a and c
• C. a and b
• D. b and c

Answer 1

The correct option is C a and b

Plants :
Plants are photosynthetic organisms which can prepare their own food in the form of carbohydrates from simple inorganic compounds such as carbon dioxide and water, by using the sun’s energy which they trap with the help of the chlorophyll pigment. Thus, they can convert the solar energy into chemical energy stored in the food that they prepare.

Photosynthetic bacteria :
Photosynthetic bacteria are photoautotrophs which trap the sun’s energy with the help of pigments such as bacteriochlorophyll and use it to prepare their food in the form of carbohydrates from simple inorganic compounds such as carbon dioxide and water. Thus, they can convert the solar energy into chemical energy stored in the food that they prepare.

Chemosynthetic bacteria :
Chemosynthetic bacteria are also autotrophic and can prepare their food from simple inorganic compounds. But, instead of using the sun’s radiant energy, they use chemical energy obtained from the oxidation of organic or inorganic compounds.

Final answer :
(A) a and b