Which of the following statements are correct?
(A) Certain mass of living material at each trophic level is called as standing crop.
(B) The crop that can withstand adverse conditions is called standing crop .
(C) The amount of nutrients in soil is called Biomass.
(D) Only Biotic components make an Ecosystem .
(E) Most of Phytoplanktons are member of algae.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) and (E) only
(A) Certain mass of living material at each trophic level is called as standing crop. — True. The standing crop is the mass (or number) of living organisms at a trophic level at a particular time.
(B) The crop that can withstand adverse conditions is called standing crop . — False. Standing crop has nothing to do with surviving bad conditions; it is a measure of living mass.
(C) The amount of nutrients in soil is called Biomass. — False. The amount of nutrients in the soil is the standing state; biomass is the mass of living organisms.
(D) Only Biotic components make an Ecosystem . — False. An ecosystem is made of both biotic and abiotic components working together.
(E) Most of Phytoplanktons are member of algae. — True. Phytoplankton are mostly small free-floating algae, the producers of aquatic ecosystems.
NCERT Extract:
Energy Flow – “… Each trophic level has a certain mass of living material at a particular time called as the standing crop. The standing crop is measured as the mass of living organisms (biomass) or the number in a unit area. The biomass of a species is expressed in terms of fresh or dry weight. Measurement of biomass in terms of dry weight is more accurate.”
Summary – “An ecosystem is a structural and functional unit of nature and it comprises abiotic and biotic components.”