English Medium कक्षा १० - CBSE Question Bank Solutions

The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as ______.

If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be ______.

In an ecosystem, herbivores represent ______.

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

Which of the following is a logical sequence of food chain?

Which of the following is an autotroph?

Food chains are very important for the survival of most species.

If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

Food chains are very important for the survival of most species.

Matter and energy are two fundamental inputs of an ecosystem. Movement of:

Observe the food web and answer the questions given below:

Why do all food chains start with plants?

Buckminsterfullerene is an allotropic form of

In a food chain, the third trophic level is always occupied by

In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

Which group of organisms are not constituents of a food chain?

1. Grass, lion, rabbit, wolf
2. Plankton, man, fish, grasshopper
3. Wolf, grass, snake, tiger
4. Frog, snake, eagle, grass, grasshopper

What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.

In the following food chain, vertical arrows indicate the energy lost to the environment and horizontal arrows indicate energy transferred to the next trophic level. Which one of the three vertical arrows (A, C and E) and which one of the two horizontal arrows (B and D) will represent more energy transfer? Give reason for your answer.

A food chain in a forest ecosystem

In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.

GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK

Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.

Reason (R): The flow of energy in a food chain is unidirectional.

If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.