Class 10 Exam > Class 10 Notes > Science Class 10 > Unit Test: Our Environment
Unit Test: Our Environment | Science Class 10 PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question number 12 & 13 carry 5 marks each.
Q1: In a food chain, the third trophic level is always occupied by (1 Mark)
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
Q2: In the given food chain, if the amount of energy at the fourth trophic level (Hawk) is 5 kJ, what will be the energy available at the producer level (Plant)? (1 Mark)
Plants → Insects → Frog → Snake → Hawks
(a) 5 kJ
(b) 50 kJ
(c) 500 kJ
(d) 5000 kJ
Q3: Depletion of ozone is mainly due to: (1 Mark)
(a) chlorofluorocarbon compounds
(b) carbon monoxide
(c) methane
(d) pesticides
Q4: Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the (1 Mark)
(a) food web
(b) ecological pyramid
(c) ecosystem
(d) food chain
Q5: Why are green plants called producers? (1 Mark)
Q6: List two biotic components of a biosphere. (2 Marks)
Q7: What is meant by biological magnification? (2 Marks)
Q8: What are decomposers? List two important roles they play in the environment. (2 Marks)
Q9: In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producers? (3 Marks)
Grass → Deer → Lion
Q10: What does a trophic level represent in a food chain? State the position of autotrophs and herbivores in a food chain. (3 Marks)
Q11: “Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues.” State the reason to explain how and why it happens. (3 Marks)
Q12: “Industrialisation has adversely deteriorated the environment.” Give four reasons in support of this statement. (5 Marks)
Q13: Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem. (5 Marks)
You can find the solutions of this Unit Test here: Unit Test (Solutions): Our Environment
The document Unit Test: Our Environment | Science Class 10 is a part of the Class 10 Course Science Class 10.
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FAQs on Unit Test: Our Environment - Science Class 10
| 1. What is the importance of our environment? |  |
Ans.The environment is crucial for sustaining life on Earth. It provides essential resources such as air, water, and food. A healthy environment supports biodiversity, regulates climate, and offers recreational spaces, contributing to human well-being and quality of life.
| 2. How can individuals contribute to protecting the environment? | |
Ans. Individuals can protect the environment by adopting sustainable practices such as reducing waste, recycling, conserving energy, using public transportation, and supporting eco-friendly products. Small actions, when multiplied by millions, can lead to significant positive impacts on the environment.
| 3. What are some common environmental issues today? | |
Ans. Common environmental issues include climate change, pollution (air, water, and soil), deforestation, loss of biodiversity, and waste management challenges. These issues threaten ecosystems, human health, and the planet's future.
| 4. How does climate change affect our environment? | |
Ans. Climate change leads to rising temperatures, shifting weather patterns, and more extreme weather events. It impacts ecosystems, causes sea levels to rise, and threatens food and water security, leading to challenges for both wildlife and human populations.
| 5. What role do governments play in environmental protection? | |
Ans. Governments play a critical role in environmental protection by creating and enforcing laws and regulations, promoting sustainable practices, investing in renewable energy, and supporting conservation efforts. They also participate in international agreements to address global environmental issues.
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