Leghaemoglobin prevents oxygen poisoning which causes inactivation of nitrogenase.

Correct Option: D

Leghaemoglobin prevents oxygen poisoning which causes inactivation of nitrogenase.

Biotic community is an association of individuals of different species living in the same habitat and showing functional interactions.

Correct Option: A

Biotic community is an association of individuals of different species living in the same habitat and showing functional interactions.

Detrivores, (e.g. earthworm) break down detritus into smaller particles. The species that invade a bare area in succession is called pioneer species. The products of ecosystem processes are termed as ecosystem services, e.g., healthy forest ecosystems purify air and water, mitigate droughts and floods etc. Natality refers to number of births during a given period in the population.

Correct Option: D

Detrivores, (e.g. earthworm) break down detritus into smaller particles. The species that invade a bare area in succession is called pioneer species. The products of ecosystem processes are termed as ecosystem services, e.g., healthy forest ecosystems purify air and water, mitigate droughts and floods etc. Natality refers to number of births during a given period in the population.

In an ecosystem, producers (e.g., plants/ phytoplankton) belong to first trophic level, herbivores or primary consumer (e.g., grasshopper) to the second and carnivores or secondary consumer (e.g., lion, wolf) to the third trophic level.

Correct Option: B

In an ecosystem, producers (e.g., plants/ phytoplankton) belong to first trophic level, herbivores or primary consumer (e.g., grasshopper) to the second and carnivores or secondary consumer (e.g., lion, wolf) to the third trophic level.

Plants are producers which can prepare their food by the process of photosynthesis. Zooplanktons, fish and man are primary, secondary and tertiary carnivores respectively.

Correct Option: B

Plants are producers which can prepare their food by the process of photosynthesis. Zooplanktons, fish and man are primary, secondary and tertiary carnivores respectively.