The ozone layer serves as a shield for the earth. It keeps dangerous UV rays out of the atmosphere, which are hazardous and can cause skin cancer. However, air pollutants such as chlorofluorocarbons...
If all the waste we generate is biodegradable, will this have no impact on the environment?
Microorganisms breakdown biodegradable wastes into simpler molecules that can be used as a raw material by companies. However, the following are the consequences of a surplus of biodegradable waste:...
What are the problems caused by the non-biodegradable wastes that we generate?
The following are some of the issues that non-biodegradable wastes cause: Microorganisms are unable to breakdown these compounds.Dumping becomes a challenge as the quantity grows.In the top trophic...
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Biological amplification is the gradual increase in the concentration of the non-biodegradable contaminants in the food chain. All subsequent levels are affected as ecological amplification occurs...
Will the impact of removing all the organisms in the trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
Yes, the effects of removing all species from a trophic level will vary depending on the trophic level. If all the producers are gone, there is a potential that the principal consumers would die or...
What will happen if we kill all the organisms in one trophic level?
If all of the species in one trophic level are killed, the food supply to the next level will be cut off, causing an ecosystem imbalance. As a result, the animals at higher trophic levels will die,...
Which of the following are environment-friendly practices? a. Carrying cloth bags to put purchases in while shopping b. Switching off unnecessary lights and fans c. Walking to school instead of getting your mother to drop you on her scooter d. All of the above
All of the above
Which of the following constitute a food-chain? a. Grass, wheat and mango b. Grass, goat and human c. Goat, cow and elephant d. Grass, fish and goat
b. Grass, goat and human The grass is the primary producer, the goat is the primary consumer, and the human is the secondary consumer in this scenario.
Which of the following groups contain only biodegradable items? a. Grass, flowers and leather b. Grass, wood and plastic c. Fruit peels, cake and lime juice d. Cake, wood and grass
a) Grass, flowers and leatherc) Fruit peels, cake and lime juiced) Cake, wood and grass The groupings that contain exclusively biodegradable things are the most important. That group cannot be...
How can you help in reducing the problem of waste disposal? Give any two methods.
The following are some suggestions for reducing the trash disposal issue: 3 R's: The 3 R's can help to alleviate the problem of waste disposal. Reduce, recycle, and reuse are the three R's. Air...
What is ozone and how does it affect the ecosystem?
Ozone is a molecule made up of three oxygen atoms that is classified as an isotope of oxygen. The major function of the ozone layer is to protect the earth's surface from the sun's harmful UV rays....
Give any two ways in which non-biodegradable substances would affect the environment.
The following are some of the ways that non-biodegradable compounds might harm the environment: They cause soil, air and water pollution.They have the potential to produce bio-magnification in the...
Give any two ways in which biodegradable substance would affect the environment.
Biodegradable compounds would have the following effects on the environment: They help to keep the environment clean since they degrade quickly. 2. With the help of decomposers, they can easily...
Why are some substances biodegradable and some non-biodegradable?
Because microbes like bacteria and decomposers like saprophytes have a specific role to play, some compounds are biodegradable while others are not. They can only break down natural materials like...
What is the role of decomposers in the ecosystem?
The roles of a decomposer in the ecosystem are: By decomposing the dead plants and animals, they operate as a cleaning agent for the environment.They help in recycling the nutrientsBy decomposing...
What are the trophic levels? Give an example of a food chain and state the different trophic levels in it.
The transfer of food or energy occurs at several levels in the food chain, and these levels are referred to as trophic levels. Example: Grass → Goat → Man In the food chain, The first trophic level...
11. Excessive exposure of humans to U V-rays results in
(i) damage to the immune system (ii) damage to lungs (iii) skin cancer (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iii) (d) (iii) and (iv) Correct option – ( c ) Explanation...
10. Flow of energy in an ecosystem is always
(a) unidirectional (b) bidirectional (c) multidirectional (d) no specific direction Correct option – ( a ) Explanation for correct option – the flow of energy in an ecosystem is always in one...
9. Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the
(a) food web (b) ecological pyramid (c) ecosystem (d) food chain Correct option – ( a ) Explanation for correct option – food web is composed of organisms of higher trophic level which eat several...
8. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
(a) heat energy (b) light energy (c) chemical energy (d) mechanical energy Correct option – ( c ) Explanation for correct option – energy that is transmitted from one trophic level to another one is...
7. Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
(a) decomposers (b) producers (c) herbivores (d) carnivores Correct option – ( b ) Explanation for correct option – producers are those which produce their own food with the help of solar energy ,...
6. Depletion of ozone is mainly due to
(a) chlorofluorocarbon compounds (b) carbon monoxide (c) methane (d) pesticides Correct option – ( a ) Explanation for correct option - in the stratosphere chlorofluorocarbon compounds are...
5. Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
(a) eutrophication (b) pollution (c) biomagnification (d) accumulation Correct option – ( c ) Explanation for correct option – biomagnification refers to the rise in concentration of adverese...
4. 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 (a) 5 k J (b) 50 k J (c) 500 k J (d) 5000 k J Correct option – ( d ) Explanation for correct option – at a particular trophic level the available energy...
3. An ecosystem includes
(a) all living organisms (b) non-living objects (c) both living organisms and non-living objects (d) sometimes living organisms and sometimes non-living objects Correct option – ( c ) Explanation...
2. In a food chain, the third trophic level is always occupied by
(a) carnivores (b) herbivores (c) decomposers (d) producers Correct option – ( a ) Explanation for correct option – carnivores are placed at the third place in the trophic level . Explanation for...
1. Which one of the following is an artificial ecosystem?
(a) Pond (b) Crop field (c) Lake (d) Forest Correct option – ( b ) Explanation for correct option – crop field is artificial ecosystem . It is an area in which plants are grown selectively ....