Practice Test

Q1) In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of: Show Answer

Q2) Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the ________. Show Answer

Q3) 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 Show Answer

Q4) The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about: Show Answer

Q5) Select the mismatch pair in the following and correct it: Show Answer

Q6) Which one of the following is an artifical ecosystem? Show Answer

Q7) In a food chain, the third trophic level is always occupied by Show Answer

Q8) Which one of the following green house gases is a contributor due to incomplete combustion of coal and petroleum? Show Answer

Q9) Depletion of ozone is mainly due to _______. Show Answer

Q10) Excessive exposure to humans to UV-rays results in
(i) Damage to immune system
(ii) Damage to lungs
(iii) Skin cancer
(iv) Peptic ulcers Show Answer

Q11) Which of the following are environment- friendly practices? Show Answer

Q12) Accumulation of non- biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as Show Answer

Q13) Disposable plastic plates should not be used because Show Answer

Q14) What happens to the earth's temperature due to the greenhouse effect? Show Answer

Q15) Why is it difficult to degrade non-biodegradable wastes? Show Answer

Q16) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Food chain is responsible for the entry of harmful chemicals in our bodies.
Reason (R): The length and complexity of food chains vary greatly. Show Answer

Q17) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Greater number of individuals are present in lower trophic levels.
Reason (R): The flow of energy is unidirectional. Show Answer

Q18) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Herbivores are called first order consumers.
Reason (R): Tiger is a top carnivore. Show Answer

Q19) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Flow of energy in a food chain is unidirectional.
Reason (R): Energy captured by autotrophs does not revert back to the solar input and it passes to the herbivores. Show Answer

Q20) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): First trophic level in a food chain is always a green plant.
Reason (R): Green plants are called producers. Show Answer

Q21) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Decomposers keep the environment clean.
Reason (R): They recycle matter by breaking down the organic remains and waste products of plants and animals. Show Answer

Q22) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): The concentration of harmful chemicals is more in human beings.
Reason (R): Man is at the apex of the food chain. Show Answer

Q23) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): CFCs deplete the ozone layer.
Reason (R): CFCs are used as refrigerants and in fire extinguishers. Show Answer

Q24) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Polythene bags and plastic containers are non- biodegradable substances.
Reason (R): They can be broken down by micro - organisms in natural simple harmless substances. Show Answer

Q25) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Ozone is both beneficial and damaging.
Reason (R): Stop the release of chlorofluorocarbons to protect the ozone. Show Answer

Q26) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Wastes such as plastics, paper, vegetable or fruit peels, which are generated in our house daily are biodegradable.
Reasons (R): Biodegradable wastes can be broken down into simpler, harmless substance in nature in due course of time by the biological processes such as action of microorganisms. Show Answer

Q27) 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? Show Answer

Q28) If Ravi is consuming curd/ yogurt for lunch, which trophic level in a food chain he should be considered as occupying?
OR
Mr.X is eating curd/ yogurt. For this food intake in a food chain he should be considered as occupying Show Answer

Q29) The decomposers are not included in the food chain. The correct reason for the same is because decomposers: Show Answer

Q30) Matter and energy are two fundamentals inputs of an ecosystem. Movement of Show Answer

Q31) Which of the following limits the number of trophic levels in a food chain? Show Answer

Q32) Which trophic level is incorrectly defined?
Show Answer

Q33) Why do all food chains start with plants? Show Answer

Q34) Which trophic level is incorrectly defined? Show Answer

Q35) Consider the following statements concerning food chains:
I. Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
II. Removal of most of the carnivores resulted in an increased population of herbivores.
III. The length of the food chains is generally limited to 3 - 4 trophic levels due to energy loss.
IV. The length of the food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct? Show Answer

Q36) Which of the following group of organisms are not included in ecological food chain? Show Answer

Q37) Choose the waste management strategy that is matched with correct example. Show Answer

Q38) Recycling of paper is a good practice but recycled paper should not be used as food packaging because Show Answer

Q39) Effective segregation of waste at the point of generation is very important. Select the appropriate statements giving the importance of waste segregation.
i. Less waste goes to the landfills.
ii. Better for public health and the environment.
iii. Help in reducing the waste.
iv. Resulting in deterioration of a waste picker's health. Show Answer

Q40) The maximum concentration of pesticides are found in Show Answer

Q41) Which of these methods could be applied to reduce our intake of pesticides through food to some extent? Show Answer

Q42) Various steps in a food chain represent: Show Answer

Q43) With regard to various food chains operating in an ecosystem, man is a : Show Answer

Q44) First link in any food chain is usually green plants. Which of the following statements gives the correct explanation about the above statement? Show Answer

Q45) Which of these is the producer? Show Answer

Q46) Which organisms are primary consumers? Show Answer

Q47) Which organisms will receive maximum energy in the ecosystem? Show Answer

Q48) Which organisms represent top level carnivores? Show Answer

Q49) What will happen if we kill all the organisms in one trophic level? Show Answer

Q50) Eutrophicated water usually looks turbid green in colour because of Show Answer

Q51) In eutrophicated water body, growth rate of phytoplankton is high because of: Show Answer

Q52) There is an extremely low level of dissolved oxygen in a eutrophicated water body because: Show Answer

Q53) A portion of a river is covered with a green layer of tiny floating organisms L on its surface and the pond water also contains organisms like tadpole, small fish, Alligator. Which of the following is the correct food chain for the above organisms? Show Answer

Q54) Which of the following steps are used to treat industrial wastes and reduce pollution?
(i) Recycle the wastes
(ii) Discharge the wastes into the sea
(iii) Treat and neutralise harmful chemicals in the wastes
Show Answer

Q55) How many food chains are present in the food web depicted above? Show Answer

Q56) Based on the above information, indicate the amount of energy that an organism C may have received from an organism from the previous trophic level. Show Answer

Q57) In the food web depicted above, identify the most energy efficient link for tertiary consumer. Show Answer

Q58) Which organism acts as both the secondary consumer and the tertiary consumer? Show Answer

Q59) Trophic levels are formed by which of the following components? Show Answer

Q60) A considerable increase in plant life in the lake was noticed after the farming activity intensified. The most likely reason for this could be: Show Answer

Q61) _________ is the increase in the concentration of harmful chemical substances in the body of living organisms. Show Answer

Q62) An expert agriculturist suggests to the farmer to minimize the use of chemical fertilizers and instead use biofertilizers as they have many advantages over chemical fertilizers.
Which of the following is NOT true for biofertilizers? Show Answer

Q63) Which of these is a way to prevent accumulation of harmful chemicals in our bodies? Show Answer

Q64) Which of the following does NOT exist in a balanced ecosystem? Show Answer

Q65) The green dustbin signifies: Show Answer

Q66) Degradation of non-biodegradable waste is difficult because: Show Answer

Q67) Which of these group(s) contains only non-biodegradable items?
i) Wood, paper, leather
ii) Polythene, detergent, PVC
iii) Plastic, detergent, grass
iv) Plastic, bakelite, DDT Show Answer

Q68) We should minimize the use of disposable plastic bags as Show Answer

Q69) Which of the following is an incorrect pair? Show Answer

Q70) Which of the following is not a functional component of an ecosystem? Show Answer

Q71) Flow of energy in an ecosystem is always Show Answer

Q72) What happens in biological magnification? Show Answer

Q73) Burning of waste products at high temperature to form ash, reduces waste considerably. This method of waste disposal is called Show Answer

Q74) Assertion : Biotic components of an ecosystem include all the living organisms present in that ecosystem.
Reason : Biotic components also include wind, gases, light, etc. Show Answer

Q75) Assertion : Food chains generally consist of more than four trophic levels.
Reason : There is loss of energy at each trophic level and very little usable energy remains after four trophic levels. Show Answer

Q76) Assertion : Producers are present at the first trophic level.
Reason : Consumers or heterotrophs fix energy and make it available for autotrophs. Show Answer

Q77) Assertion : Certain pesticides and other chemicals used to protect our crops from diseases and pests are non-biodegradable.
Reason : They do not get accumulated at various trophic levels. Show Answer

Q78) Assertion : Ozone layer shields the surface of Earth from UV radiations.
Reason : The UV radiations are highly damaging to organisms. Show Answer

Q79) Which of the following option correctly represent the biotic and abiotic components of ecosystem? Show Answer

Q80) Biomagnification is highest in Show Answer

Q81) Organisms which synthesis carbohydrates from inorganic compounds using radiant energy are called Show Answer

Q82) In a food chain, the snake an predates as rabbit which fed on fresh green bushes. What percentage of the energy accumulated by rabbit, would be acquired by snakes? Show Answer

Q83) Bad ozone is formed in Show Answer

Q84) Assertion (A) : the autotrophs are at the first trophic level.
Reason (R) : autotrophs fix up the solar energy and make it available for consumers. Show Answer

Q85) Assertion (A) : the green plants capture about 10% of the energy of sunlight that falls on their leaves.
Reason (R) : when green plants are eaten by primary consumers, a great deal of energy is lost as heat to the environment. Show Answer

Q86) Assertion (A) : biodegradable domestic wastes can be buried in a pit, dug into ground.
Reason (R) : they are converted into compost and used as manure. Show Answer

Q87) The correct order of animals in food chain operating in a river is Show Answer

Q88) If concentration of DDT in W is estimated to be 0.4 ppm, then amount of DDT in Y and Z would respectively be Show Answer

Q89) The decomposers are not included in the food chain. The correct reason for the same is because decomposers : Show Answer

Q90) Which amongst the following are hazardous for the environment?
I. Pesticides II. Fertilisers
III. Heavy metals IV. Manures Show Answer

Q91) Which of the following waste does not decompose at all? Show Answer

Q92) Choose the correct statements regarding non- biodegradable wastes.
I. Easily decomposed by fungi.
II. Enter into food chain and get magnified.
III. Biological in origin.
IV. Cause soil pollution. Show Answer

Q93) Which of the following solid waste comes under the category of R? Show Answer

Q94) Which of the following is the safe method of disposal of the non- biodegradable waste? Show Answer

Q95) Incineration is another method of waste disposal which is used for Show Answer

Q96) Due to biomagnification, which of the following substances accumulate and go on concentrating at each trophic level? Show Answer

Q97) Which of the following pyramid given below correctly represents the food chain? Show Answer

Q98) Which of the following is the correct reaction involved in formation of ozone layer?
Show Answer

Q99) Which of the following is biodegradable? Show Answer

Q100) Which of the following is non-biodegradable? Show Answer

Q101) Which one of the following will undergo fastest bio-degradation? Show Answer

Q102) In an ecosystem, herbivores represent Show Answer

Q103) Trophic level in an ecosystem represents Show Answer

Q104) A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in Show Answer

Q105) First link in any food chain is usually green plants because Show Answer

Q106) Which of the following statements about food chain and energy flow through ecosystem is false? Show Answer

Q107) Which of the following is a logical sequence of food chain Show Answer

Q108) Which of the following is an autotroph ? Show Answer

Q109) In the garden ecosystem, which of the following are producers ? Show Answer

Q110) An ecosystem includes Show Answer

Q111) Which group of organisms are not constituents of a food chain? Show Answer

Q112) If a grasshopper is eaten by a frog, then the energy transfer will be from Show Answer

Q113) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Vegetarian food habit is more beneficial to organisms.
Reason (R): Only 10% energy is available as food from one tropic level to next. Show Answer

Q114) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Accumulation of harmful chemicals is maximum in case of organisms at higher tropic level.
Reason (R): Food chain normally do not go beyond 3 or 4 tropic level. Show Answer

Q115) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Ozone layer is getting depleted at upper atmosphere which is a cause of concern.
Reason (R): CFC reacts with ozone and breaks it. Show Answer

Q116) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Autotrophs can produce food on its own.
Reason (R): Green plants can absorb 1% energy of sunlight that fall on the leaves. Show Answer

Q117) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
Assertion (A): Biodegradable waste and non biodegradable waste should be discarded separately.
Reason (R): Biodegradable waste are not harmful. Show Answer

Q118) Decomposers get their energy directly from autotrophs. Show Answer

Q119) Ozone layer presents harmful infrared radiation. Show Answer

Q120) Factors such as light, temperature, pressure and humidity are considered as biotic components. Show Answer

Q121) Food chain generally consist of three or four organisms. Show Answer

Q122) Disposal of waste means recycling of wastes. Show Answer

Q123) The disposal of wastes by putting it in low-lying areas of ground and covering it with earth is called landfill. Show Answer