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What are the abiotic components of an ecosystem?
How much energy of Sun can be converted into food energy by the green plants?
Why only 10% energy and mass is transferred to next level in a food chain?
What is meant by a trophic level?
Pick the biodegradable substances from the following:
Cotton, rubber, leather, radioactive material.
Pick the non-biodegradable, substances from the following:
Animal bones, wool, paper, glass.
Select from the following substances which have posed a threat to the environment:
Aerosols, consumers, bacteria, CFCs.
Give the full form of CFC.
What happens during the first step of ozone formation in the atmosphere?
Choose one consumer each that belongs to the second and third trophic levels from the organisms given below:
Eagle, frog, tiger, rabbit, box.
State 10% law. Explain with an example how energy flows through different trophic levels.
(a) How do autotrophs prepare their food?
(b) In the following food chain, 500J of energy is available to plant. How much energy will be available at I consumer and II consumer levels?
Plant → Sheep → Man
Describe how ozone present in the atmosphere is important for sustaining the life on earth.
Mention any one advantage of using disposable paper cups over disposable plastic cups. Mention of manner in which these paper cups do not adversely affect the environment.
What would happen if a number of carnivores decreases in an ecosystem?
Explain how do decomposers help is recycling of materials in the ecosystem.
Name the radiations from the Sun that are absorbed by ozone layer. Mention one harmful effect caused by them.
Explain how making of “Kulhads” affects our environment.
What are top carnivores? Give two examples.
Will the impact of removing all the organisms is a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
Why is depletion of ozone layer a cause of concern?
Draw a line diagram to show flow of solar energy in ecosystem.
In a certain study conducted on occurrence of DDT along food chains in an ecosystem, the concentration of DDT in grass was found to be 0.5 ppm (parts per million), in sheep it was 2ppm and in man it was 10 ppm. Why was the concentration of DDT maximum in case of man?
Construct a food web by connecting three food chains.
“Energy flow in a food chain is unidirectional”. Justify this statement.
Show steps of food chains operating in:
(a) Forests
(b) Grasslands
(c) Ponds.
What are the problems caused by the non-biodegradable wastes that we generate?
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the:
Flow of energy in an ecosystem is always:
Disposable plastic plates should not be used because:
Depletion of ozone is mainly due to:
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called:
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of:
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
The decomposers in an ecosystem:
In a food chain, the third trophic level is always occupied by:
An ecosystem includes:
Which of the following limits the number of trophic levels in a food chain?
In the given food chain, suppose the amount of energy at 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 knows as:
Which one of the following is an artificial ecosystem?
In the given figure, the various trophic levels are shown in the form of a pyramid. At which trophic level is maximum energy available and at which trophic level maximum number of organisms are present?
Write true or false for the following statements:
The length and complexity of food chains remain mostly the same.
The flow of energy in a food chain is in both the directions.
The flow of organic matter in a food chain is unidirectional.
15% can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers.
The green plants capture about 10% of the energy of sunlight that falls on their leaves and convert it into food energy.
In any food chain, an average of 10% of the food eaten in turned into the body mass of an organism and made available for the next level of consumers.
There are generally a greater number of individuals at the lower trophic levels of an ecosystem.
Harmful chemicals enter into our body through biological magnification.
