Ecosystem

Q. What are primary, secondary and tertiary consumer?

Q.

How does temperature affect an ecosystem?

Q.

Which of the following is an artificial ecosystem?

(a) pond

(b) crop field

(c) lake

(d) forest

Q.

Mention the components of the biosphere.

Q.

Name two natural ecosystems and two artificial ecosystems.

Q.

Which one of the following is not a terrestrial ecosystem? Forest, Grassland, Aquarium, Desert

Q.

How can an aquarium be made into a self-sustaining unit like a natural ecosystem?

1. By adding some chemicals into its water.

2. By adding more plants and animals.

3. By bubbling more oxygen gas through aquarium water.

4. By bubbling more carbon dioxide gas through aquarium water.

Q.

(a) Define an ecosystem. Give examples of any two ecosystems.

(b) List the biotic and abiotic components of an ecosystem.

Q. Deserts, grasslands, forests are examples of natural ecosystem.

1. True
2. False

Q.

What is the functional unit of the environment comprising of the living and non-living components called?

Q.

Question 29
Select the mismatched pair in the following and correct it.
(a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain
(b) Ecosystem — Biotic components of the environment
(c) Aquarium — A man-made ecosystem
(d) Parasites — Organisms which obtain food from other living organisms

Q.

The biosphere is made of:

1. Living beings and their remains

2. Living beings, lithosphere, hydrosphere, and atmosphere

3. Living beings and lithosphere

4. Living beings, lithosphere, and hydrosphere.

Q.

Biotic component of biosphere is not constituted by

1. Producers

2. Consumers

3. Decomposer

4. Air

Q. "Human beings occupy the top level in anu food chain". What are the consequrnces of this in oir body

Q. Which amongst the following are heterotrophs?

1. Jaguars
2. Sharks
3. Human beings
4. Bears

Q.

Classify the following as biotic and abiotic components:
Rain fall, a rose plant, soil, fish, earthworm, fertilizers, temperature, bacteria.

Q.

How do humans disrupt ecosystem services?

Q. what is the percantage of solar energy trapped and utilised?

Q. Identify the correct statements and choose the correct option.
(i) Ozone is poisonous.
(ii) Ozone absorbs harmful radiations from the sun.
(iii) CFCs are responsible for ozone layer depletion.
(iv) Ozone is a diatomic molecule.

1. (i), (ii), (iii)
2. (i), (ii), (iv)
3. (i), (ii), (iii), (iv)
4. (ii), (iii), (iv)

Q. Insects are abiotic components of the ecosystem.

1. True
2. False

Q. Which of the following gas causes ozone depletion?

1. Hydrogen
2. Oxygen
3. CFC
4. Nitrogen

Q. Autotrophs are also known as_________.

1. producers
2. primary consumers
3. secondary consumers
4. tertiary consumers

Q.

The region of earth where life exists is known as _____.

Q.

A crop field is termed as an artificial ecosystem. Why?

Q.

Which of the following belong to same trophic level?

A. Cockroach and spider

B. Lizard and spider

C. Hawk and spider

D. Lizard and hawk

Q.

What is the major reason for a food chain to have limited trophic levels of 3-4 only?

1. Population at each trophic level increases

2. There is lot of competition for survival

3. Energy loss at each level

4. Biomass at each level varies.

Q.

An ecosystem includes :

(a) all living organisms

(b) non-living objects

(c) both living organisms and non-living objects

(d) all living organisms and input of sun's energy

Q.

What will happen if we kill all the organisms in one tropic level? [2 MARKS]

Q. Match the description with the correct term.

1. Erosion
2. Farming
3. Deforestation

Q.

Why does a food chain normally consists of only 4-5 steps?