An ecosystem includes
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 known as
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
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
Excessive exposure of humans to U V-rays results in
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcers
Which group of organisms are not constituents of a food chain?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper
In the following groups of materials, which group (s) contains only non-biodegradable items?
(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, bakelite, DDT
Which of the following limits the number of trophic levels in a food chain?
Which of the statement is incorrect?
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
The decomposers in an ecosystem
In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
If a grass hopper is eaten by a frog, then the energy transfer will be from
Disposable plastic plates should not be used because
Which one of the following is an artificial ecosystem?
What is the name of the process by which a compound such as a pollutant or a pesticide increases its concentration in the tissues of successive organisms as it moves up in the food chain?
Depletion of ozone is mainly due to
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
In a food chain, the third trophic level is always occupied by
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