Our Environment_Unsolved Paper
Chapter: Our Environment | Topic: Trophic Levels
OUR ENVIRONMENT_UNSOLVED PAPER
Topic: Trophic Levels
Q1. Which of the following is an abiotic component of an ecosystem?
- Grass
- Bacteria
- Sunlight
- Deer
Q2. Which group of organisms plays an important role in breaking down dead plants and animals?
- Producers
- Decomposer
- Herbivores
- Carnivores
Q3. A farmer uses chemical pesticides repeatedly in a crop field. Which environmental problem may become more serious if these chemicals enter food chains?
- Biomagnification
- Pollination
- Germination
- Transpiration
Q4. Which statement best describes an ecosystem?
- Only the animals living in a particular area
- Only the non-living surroundings of organisms
- Living organisms interacting with one another and with their physical surroundings
- A group containing only producers
Q5. Why is the ozone layer important for living organisms?
- It increases the amount of carbon dioxide in the atmosphere
- It protects living organisms from harmful ultraviolet radiation
- It produces food for green plants
- It increases soil fertility
Q6. Which of the following is most likely to disturb the natural balance of an ecosystem?
- Recycling household waste
- Planting native trees
- Excessive use of non-biodegradable materials
- Protecting local wildlife
Short questions
Q1. What is an ecosystem? Name any two types of ecosystems that you may observe in your surroundings.
Q2. Differentiate between biotic and abiotic components of the environment. Give one example of each.
Q3. Why are decomposers necessary for maintaining an ecosystem? What could happen to dead organic matter if decomposers were absent?
Q4. A student throws a plastic wrapper in the school garden every day. Explain why such waste can create a long-term environmental problem.
Q6. What is meant by biodegradable and non-biodegradable substances? Give one example of each from everyday life.
Q6. Why should human activities that damage natural ecosystems be controlled? Mention two possible effects of disturbing the environmental balance.
Q1. Explain the major components of an ecosystem. Discuss how living organisms interact with non-living factors such as air, water, soil, temperature and sunlight.
Q2. Explain the role of decomposers in an ecosystem. Why are processes such as decomposition important for the continued availability of materials needed by living organisms?
Q3. Non-biodegradable waste has become a major environmental concern in cities and villages in India. Explain how excessive accumulation of such waste can affect organisms and ecosystems. Suggest suitable practices that people can follow to reduce this problem.
Q1. A school conducted a waste survey for one day and collected the following:
(a) What was the total amount of waste collected?
(b) Calculate the amount of waste other than plastic wrappers.
Q2. A village pond contains fish, algae, aquatic plants, insects, bacteria, water, sunlight and soil.
Classify the given components into biotic and abiotic groups. Then state the number of components belonging to each group.
Q3. A town produces 120 kg of household waste in one day. Out of this, 72 kg is biodegradable waste and the remaining waste is non-biodegradable.