Contribute & Test Your Skills
- Chemical Reactions & Equations
- Acid, Bases & Salts
- Metals & Non Metals
- Carbon & Its Compounds
- Periodic Classification of Elements
- Life Processes
- Respiration
- Control and Coordination
- How Do Organism Reproduce
- Heredity and Evolution
- Light: Reflection and Refraction
- Human Eye and Colorful World
- Electricity
- Magnetic Effect of Electric Current
- Sources of Energy
- Our Environment
- Management of Natural Resources
Popular Questions
- The following graph shows the concentration of oxygen in a river
- Does change in lifestyle add waste to the environment?
- Assertion : Biomagnification is caused due to Reason : Biomagnification leads to the
- A lake has been polluted by sewage. On comparison with the sample of unpolluted water
- suggest any five activities in daily life, which are eco-friendly.
- How is Earth kept warm by nature? describe in detail.
- Give reason to justify the following :
- Identify a deadly poisonous gas X found at the higher levels of atmosphere.
- Look at the following figures. choose the correct one and give reason for your choice.
- A modern insecticide has been introduced with certain new properties like, accumulation in the bodies of predators,
- Give a detailed account of ozone layer depletion and the harm ozone layer depletion has caused to the ecosystem.
- An industry is being established near town.
- Correct the explanation given for the terms if wrong.
- Categories some of the activities performed by you as an eco-friendly person.
- Number of trophic levels is limited to 3-4 in a food chain. Give reason.
- Assertion : Aquariums are known as Reason : Aquariums are created
- Draw a food chain most likely to be a forest ecosystem
- Assertion : Consumers are present Reason : Consumers or heterotrophs fix
- Select the mis-matched pair in the following and correct it.
- It is the responsibility of the government to arrange for the management and disposal of waste.
- Number of vultures is decreasing remarkably in recent years which has become a matter of concern.
- Assertion : Light is the primary source of energy Reason : Light is used by autotrophs to synthesise their food.
- With the help of an example, involving four organisms, describe how energy flows through different trophic levels.
- Give any two ways in which biodegradable substances would affect the environment.
- Among all four types of animals, i.e. carnivores, decomposers, herbivores and producers
- Explain, how pesticides get a accumulated in the environment.
- (i) If the primary consumer has 400 J of energy (ii) State the 10 % law, associated with flow of energy
- Indicate the flow of energy in an ecosystem. why it is unidirectional?
- Write in detail about garbage management.
- How much energy will be available to hawks in the food chain
- What term is given to the phenomenon where a harmful chemical enters a food chain and starts accumulating?
- (i) Which part of waste is changed (ii) How can pesticides be allowed in bevarages? (iii) On recycling, waste paper is converted
- What are the trophic levels? Give an example of a food chain and state the different trophic levels in it
- Vegetarian food habits can sustain a larger number of peoples.
- Divide the wastes generated from your house into
- Give any two ways in which non-biodegradable sustances would affect the environment.
- Why are some substances biodegradable and some non-biodegradable?
- What is the role of decomposers in the ecosystem?
- State 10% law. Explain with an example how energy flows through different trophic levels
- How can you help in reducing the problem of waste disposal? Give any two methods.
