Question

Amount of inorganic substances present in an ecosystem is _______.
A. Standing crop
B. Standing state
C. Crop rotation
D. None of these

Answer 1

Inorganic substances refers to non living components of the ecosystem. Organic matter of an ecosystem is represented by standing crops. Whereas, the standing state represents the inorganic substances.

Complete answer:
An ecosystem consists of two components, biotic and non biotic. Biotic components include living things like plants, animals, other organisms. Abiotic things include air, soil, water, temperature, light. It also consists of Inorganic substances like water, carbon, nitrogen, sulphur, phosphorus. The quantity of those inorganic substances present in an ecosystem is named because the standing state or standing quality.
Crop rotation is the practice of planting different crops sequentially on an equivalent plot of land to enhance soil health, optimize nutrients within the soil, and combat pest and weed pressure. For instance, say a farmer has planted a field of corn.

Depending upon the duration, crop rotation could also be of following three types :
One year rotation: Maize – Mustard. Rice – Wheat.
Two years rotations and three years rotation: Rice – Wheat – Mung – Mustard. Sugarcane – Berseem. Cotton – Oat – Sugarcane – Peas – Maize – Wheat.
Standing state is the amount of inorganic nutrients found in an ecosystem. It represents a part of non-living matter. Among living and nonliving components of the ecosystem, inorganic nutrients get circulated. Living matters regularly depletes and replenishes the Inorganic nutrients. Whereas, the standing crop is the total amount of biomass that is present in an ecosystem. Thereby, it represents the whole living matter.
So, the amount of inorganic substances present in an ecosystem is referred to as standing state.

Thus, it can be concluded that the correct answer is option B.

Note:
The non-living matter of the ecosystem keeps on circulating between the living and nonliving components of the ecosystem. In the case of standing crops, regular synthesis and consumption of biomass are happening.