Our environment
One Marks Questions
Answer: An ecosystem is geographical area where all organisms such as plants, animals, human, microorganisms as well as physical surroundings interact with each other.
Answer: All living Organisms like plant, animal, micro Organisms are biotic components Non living things like soil, air, wate are abiotic components.
Answer: Natural and artificial ecosystem
Answer: producers are green plants which prepare it's own food.
Answer: Each steps of the food chain is called tropic level.
Answer: Several food chains are interconnects to form food web.
Answer: Concentration of chemical substance increase as it move from one tropic level to other.
Answer: ozone
Answer: chlorofluocarbon.
Answer: Loss of energy takes place in the form of metabolic heat when one organisms consume another.
Two Marks Questions
Answer: If we kill all the organisms in one tropic level transfer of energy and matter to next tropic level stops it disturbs food chain and ecosystem collaps.
Answer: during the transfer of organic food energy from one traffic level to the next traffic level only about 10% of the transfer energy is stored as flesh.
Answer: Grass → Grasshopper → Frog → snake.
Answer: if all decomposers are eliminated From the earth then decomposition of dead organisms do not occurs earth will be full of dead bodies.
Answer: according to 10% law the energy flow from one tropic level to another traffic level is 10% therefore energy available to lion is 200 J.
Answer: a food chain’s length is restricted to three or four steps do to energy loss shorter the food chain the more energy that is available to final consumer.
Answer: concentration of chemical substance increases as it move from one Tropic level to another trophic level in a food chain example DDT.
Answer: temperature, rain, soil, wind.
Answer: in a food web each Organism is eaten by two or more other kinds of organisms so a food web is a complex network of many interconnected food chains.
Answer:
1. skin cancer
2. Damage to eye
3. Effect on immunity
4. Can change structure of DNA
Three Marks Questions
Answer: tropic levels are different steps a food chain. Traffic level is the level of species in an ecosystem on the basis of the source of nutrition such as producers, primary consumers, secondary consumers etc the producers from the first traffic level as they manufacture food The primary consumers from the second tropic level, the secondary consumers from the third traffic level and tertiary consumers from the 4th Tropic level.
