Class 10 Our Environment Ecosystem Exercise

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EXERCISE 15.2

Very Short Answer Type Questions:

  1. What is an ecosystem?
  2. Which are the two components of an ecosystem?
  3. Name some abiotic components of an ecosystem.
  4. What do you understand by producers in an ecosystem?
  5. What do you understand decomposers?
  6. Give an example of a simple food chain with three trophic levels.
  7. Give an example of a simple food chain in a pond.
  8. What is the difference between a number of organisms at a lower trophic level than that at higher trophic level?
  9. What is the direction of flow of energy in an ecosystem?

Fill in the blanks:

  1. A green plant plays the role of …………….in an ecosystem.
  2. The soil is an example of ……………..factor.
  3. A rabbit plays the role of ………………….in an ecosystem.
  4. Man is at the …………..trophic level.
  5. An aquarium is an example of ……………ecosystem.
  6. Green plants convert solar energy into …………energy; in the form of food.
  7. A lot of energy is dissipated in the form of …………….during conversion of energy.

Write True/False for the following:

  1. Artificial ecosystems are self-sustaining.
  2. All natural ecosystems are self-sustaining.
  3. A particular prey is eaten by only one predator.
  4. The population of carnivores is usually less than that of herbivores.
  5. Energy flow through the food chain is in both directions.
  6. There can be a limited number of trophic levels in a food chain.
  7. Most of the energy consumed by an organism is available for the organism at next trophic level.

Short Answer Type Questions:

  1. What is the role of temperature in an ecosystem?
  2. What is the role of water in an ecosystem?
  3. Write a brief note on producers in an ecosystem.
  4. Explain the food chain with the help of a suitable example.
  5. Why is the food chain also called the energy chain?
  6. What do you understand by the unidirectional flow of energy through the food chain? What are its implications?

Long Answer Type Questions:

  1. Explain the role of some abiotic factors.

Multiple Choice Questions

  1. Which of the following shows the correct sequence in a food chain?
  • Grass à Frog à Grasshopper à Snake
  • Grass à Grasshopper à Snake à Frog
  • Grass à Grasshopper à Frog à Snake
  • Grass à Snake à Frog à Grasshopper
  1. Which is the main source of energy for all living beings?
  • Sun
  • Green plants
  • Bacteria
  • Soil
  1. Which of the following is an example of the artificial ecosystem?
  • Forest
  • Pond
  • River
  • Garden
  1. Which of the following will always be at the highest trophic level?
  • Snake
  • Lion
  • Wolf
  • Tuna
  1. Which of the following will always be at the lowest trophic level?
  • Grass
  • Grasshopper
  • Snake
  • Eagle
  1. How much of the total energy falling on leaves of a plant is utilized for food production?
  • 10%
  • 1%
  • 20%
  • 2%

Brainstorming Session

  1. Why does a poultry owner need to clean the poultry farm at regular intervals?
  2. Use of chemical fertilizers is not good for our health. Why?