Question

assertion: algae are the primary producers of many food cycles
reason: half of the total carbon dioxide fixation on earth is carried out by algae
a. Both a&r is correct and r is the explanation of a
b. both a &r is correct and r is not the explanation of a
c. a is true and r is false
d. a is false and r is true​

Answer 1

Answer:

option a is the right answer for this question

Answer 2

Both assertion and & reason is correct and reason is the explanation of assertion. (Option a)

• Algae are autotrophic organisms mainly found in aquatic or marine habitats.
• They carry out almost 50% of the total carbon dioxide fixation.
• In this way, by carrying out oxygenic photosynthesis, they help other aquatic organisms to meet their oxygen requirement for respiration.
• And, they are termed 'primary producers' in many food cycles.
• Thus, assertion and reason is correct and reason is the explanation of assertion.