Science Answer the following questions:[1 M]

What percentage of energy available at the producer level is transferred at successive trophic levels in a food chain?

Write an aquatic food chain.

What type of substances are the major pollutants of the environment? Name two such substances.

What percentage of the solar energy is trapped and utilised by the plants?

Which one term in the following includes the others?
Air, flora, fauna, environment, water, sunlight, soil.

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

How is energy introduced into the ecosystem?

Which of the following materials are non-biodegradable?
Aluminium wire, Tea leaves, Synthetic fibre, Wool.

Write a common food chain of a pond ecosystem having four links.

A food chain represents a unidirectional flow of X. What is X?

Name two waste materials which can be recycled.

Which of the following belong to the same trophic level?
Goat; Spider ; Plants ; Hawk ; Rat.

What is garbage? What does garbage consist of?

What is the role of decomposers in the ecosystem?

Where does all the energy in living organisms originate from?

Which one term in the following includes the others?
air, flora, fauna, environment, water, sunlight, soil.

Construct a food chain comprising the following:
Snakes, Hawk, Rats, Plants.

Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain.

State one advantage of using jute bags over plastic bags for shopping.

In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?

Name two predators of snakes in a food web operating in a forest ecosystem.

Name the group of chemical compounds which damages the ozone layer.

Name the organisms whose uncontrolled activities are damaging the environment.

Which organisms belong to third and fourth trophic levels in the food chain comprising the following?
Rats, Plants, Hawk, Snakes.

Write down a food chain:
with five links in it.

Define trophic level. Draw the food chain with four trophic levels.

Why are there rarely more than five links (or five organisms) in a food chain?

What are planktons?

Explain why, some materials are biodegradable but some are non-biodegradable.

The number of malaria patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for it?

What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?

Name the process by which the volume of solid wastes can be reduced.

Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following:
Frogs, Plants, Snakes, Hawk, Insects.

Construct.
A long food chain, and
A short food chain, ending with man.

Write the full form of CFC. Give its one harmful effect.

Name two natural ecosystems and two artificial ecosystems.

What are the various steps of food chain called?

Which of the following materials are biodegradable? Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil.

What is meant by ‘environment’?

If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?

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

Write down a food chain:
In the sea.

What is meant by non-biodegradable waste materials? Give two examples of nonbiodegradable wastes.

Which category of organisms forms the starting point of a food chain?

Which radiations are absorbed by ozone layer?

Why are plants called producers?

Explain why, it is better to use paper bags than plastic bags.

Write down a food chain:
Which ends with humans.

Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain? If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain? Plants → Goat → Lion

A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
Construct a food chain for the pond.
How many links are there in this chain?

Arrange the following in a food chain:
Fish, Algae, Small animals, Big Fish.