Question

Match Column-I with Column-II. Select the option with correct combination.

Column-I		Column-II
1.	Standing state	p.	Mass of living material at a given time.
2.	Pioneer species	q.	Amount of nutrients in the soil at a given time.
3.	Detritivores	r.	Species that invade a bare area.
4.	Standing crop	s.	Breakdown detritus into smaller particles.

• A. 1-p, 2-s, 3-r, 4-q
• B. 1-q, 2-r, 3-p, 4-s
• C. 1-p, 2-r, 3-s, 4-q
• D. 1-q, 2-r, 3-s, 4-p

Answer 1

The Correct Option is D

Standing state (1): Refers to the amount of nutrients in the soil at a given time, as it describes the stable nutrient content in an ecosystem. This matches with q.

Pioneer species (2): These are the first species to invade a barren area and establish a presence in a new or disturbed habitat. Hence, it matches with r.

Detritivores (3): Organisms like earthworms or fungi that feed on detritus (dead organic matter) and break it down into smaller particles. This matches with s.

Standing crop (4): Refers to the mass of living material at a given time (the total biomass of plants and animals in an ecosystem). This corresponds to p.

The correct answer is (D) : 1-q, 2-r, 3-s, 4-p.

Answer 2

The correct answer is: (D) 1-q, 2-r, 3-s, 4-p.

Explanation:

• 1. Standing state is related to q. Amount of nutrients in the soil at a given time. The standing state refers to the overall condition of an ecosystem, which includes the availability and composition of nutrients in the soil. These nutrients are essential for supporting plant growth and sustaining the food chain.
• 2. Pioneer species is related to r. Species that invade a bare area. Pioneer species are the first organisms to colonize barren or disturbed areas, such as after a volcanic eruption or glacier retreat. They are crucial in initiating the process of ecological succession, leading to the development of more complex ecosystems over time.
• 3. Detritivores is related to s. Breakdown detritus into smaller particles. Detritivores are organisms like earthworms, fungi, and certain insects that decompose dead organic matter (detritus). By breaking down larger organic matter into smaller particles, they play a key role in nutrient cycling, enriching the soil and supporting plant life.
• 4. Standing crop is related to p. Mass of living material at a given time. The standing crop refers to the total amount of living biomass (e.g., plants, animals) present in an ecosystem at a specific point in time. It reflects the productivity of the ecosystem and can vary with seasonal changes, availability of resources, and ecological interactions.

These terms are important in understanding ecological processes such as succession, nutrient cycling, and energy flow within ecosystems. Each plays a role in shaping the structure and functioning of different ecosystems over time.