What will happen if we kill all the organisms in one trophic level? [Delhi]
If we kill all the organisms in one trophic level, the following effects will take place:
Name the phenomenon in which non-biodegradable chemicals get accumulated progressively at each trophic level of a food chain.
(a) What is meant by biodegradable waste materials ? Give two examples of biodegradable wastes.
(b) Which of the following materials are non-biodegradable ?
Aluminium wire, Tea leaves, Synthetic fibre, Wool
Which of the following belong to the first trophic level of a food chain? Grass, Grasshopper, Plants, Rat, Tiger [Foreign]
Which one of the following is not a terrestial ecosystem ?
Forest, Grassland, Aquarium, Desert
Describe how decomposers facilitate recycling of matter in order to maintain balance in the ecosystem. [Foreign]
Which class of chemicals is linked to the decrease in the amount of ozone in the upper atmosphere of the earth? [Delhi]
Select two non-biodegradable substances from the following waste generated in a kitchen: spoilt food, paper bags, milk bags, vegetable peels, tin cans, used tea leaves. [Delhi]
What is the functional unit of the environment comprising of the living and non-living components called ?
State whether the following statements are true or false :State whether the following statements are true or false :
(a) In biology, human beings are called producers.
(b) Secondary consumers and tertiary consumers, both are carnivores.
Which one term in the following includes the others ?
air, flora, fauna, environment, water, sunlight, soil
Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth’s surface.
Name the wastes which are generated in your house daily. What measures would you take for their disposal?
Why are bacteria and fungi called decomposers? List any two advantages of decomposers to the environment. [Delhi]
Why did United Nations act to control the production of chlorofluorocarbons (CFCs) used in refrigerators? [Delhi]
In a food chain, 10,000 joules of energy is available to the producer. How much energy will be available to the secondary consumer to transfer it to the tertiary consumer? [All India ]
Explain the terms ‘producer’ and ‘consumer’. Give two examples of producers and two of consumers.
(a) Define decomposers. Name one decomposer.
(b) What is the role of decomposers in the ecosystem ?
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 ?
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