Chapter 15 – Our Environment

Assertion: Vegetarian food habit is more beneficial to organisms.
Reason: Only 10% energy is available as food from one trophic level to next.

In natural ecosystems, decomposers include-

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about-

The second trophic level is always of-

The decomposers in an ecosystem-

Which of the following is an abiotic component of an ecosystem?

What will happen if all the deer are killed in the given food chain?
Grass → Deer → Lion

Which of the following is not a terrestrial ecosystem-

In the garden ecosystem, which of the following are producers?

Which of the following is biodegradable?

Which of the following is an autotroph?

Which of the following is a logical sequence of food chain

A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in

Ozone layer is damaged by-

In an ecosystem, herbivores represent

Which one of the following will undergo fastest bio-degradation?

Assertion: Biodegradable waste and non biodegradable waste should be discarded separately,
Reason: Biodegradable waste are not harmful.

Assertion: Ozone layer is getting depleted at upper atmosphere which is a cause of concern.
Reason: CFC reacts with ozone and breaks it.

Flow of energy in an ecosystem is always-

The ecosystem of earth is known as-

Which of the two in the following sets belong to the same trophic level?

Acid rain is caused by the oxides of

The depletion of the ozone layer causes

Which one of the following pairs belong to the category of primary consumers?

Which of the following is biodegradable?

Which of the following is non-biodegradable-

Trophic level in an ecosystem represents

Excessive exposure to ultraviolet radiation causes

Which of the following limits the number of trophic levels in a food chain?

A food chain always starts with