Class 10 SEBA Science Chapter 15 Solutions – Our Environment (2026–27) | Assam Eduverse
Chapter Overview
SEBA Class 10 Science Chapter 15 Our Environment solutions are prepared by Assam Eduverse strictly according to the latest SEBA / ASSEB syllabus 2026–27. These SEBA Class 10 Science Chapter 15 Our Environment solutions are created for students searching specifically for SEBA Class 10 Science Chapter 15 Our Environment solutions that are accurate, updated, and exam-oriented. This page provides complete SEBA Class 10 Science Chapter 15 Our Environment solutions, making it a trusted source for SEBA Class 10 Science Chapter 15 Our Environment solutions based on the official SEBA Class 10 Science textbook.
The SEBA Class 10 Science Chapter 15 Our Environment solutions explain all concepts included in SEBA Class 10 Science Chapter 15 Our Environment solutions, such as ecosystem, food chain, food web, trophic levels, energy flow, biological magnification, biodegradable and non-biodegradable substances, and environmental balance. These SEBA Class 10 Science Chapter 15 Our Environment solutions help students understand definitions, diagrams, and processes using SEBA Class 10 Science Chapter 15 Our Environment solutions written in simple and exam-friendly language, following the ASSEB Class 10 Science Chapter 15 solutions format.
With the complete SEBA Class 10 Science Chapter 15 Our Environment solutions (2026–27), students can prepare SEBA Class 10 Science Chapter 15 Our Environment solutions for intext questions and SEBA Class 10 Science Chapter 15 Our Environment solutions for chapter-end textbook exercise questions. These SEBA Class 10 Science Chapter 15 Our Environment solutions include important ecosystem questions, diagrams, and exam-focused explanations. Assam Eduverse ensures every SEBA Class 10 Science Chapter 15 Our Environment solution is syllabus-based and exam-focused.
SEBA / ASSEB Class 10 Science Chapter 15 – Our Environment Intext Questions & Answers (Latest Syllabus 2026–27)
📝 Page 260
Q1: What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Answer: Trophic levels are the steps or levels in a food chain where organisms obtain energy. Each level represents a feeding stage in the transfer of energy.
Example: Grass → Grasshopper → Frog → Snake → Hawk
Trophic levels:
1. Producers – Grass
2. Primary consumer – Grasshopper
3. Secondary consumer – Frog
4. Tertiary consumer – Snake
5. Quaternary consumer – Hawk
Q2: What is the role of decomposers in the ecosystem?
Answer: Decomposers like fungi and bacteria break down dead plants and animals into simpler substances. They help in recycling nutrients, maintaining soil fertility, and cleaning the environment.
📝 Page 262
Q1: Why are some substances non-biodegradable?
Answer: Some substances are non-biodegradable because they cannot be broken down by natural decomposers like bacteria or fungi. These include plastics and synthetic chemicals that resist natural degradation.
Q2: Give any two ways in which biodegradable substances would affect the environment.
Answer: Two ways in which biodegradable substances would affect the environment are-
(i) Biodegradable substances are decomposed by the action of microorganisms and decomposed materials are recycled through geo-chemical cycle.
(ii) These substances keep the environment clean.
Q3: Give any two ways in which non-biodegradable substances would effect the environment.
Answer: Two ways in which non-biodegradable substances would effect the environment are-
(i) They cause air, water and soil pollution.
(ii) They may cause bio-magnification in the food chain and end up in humans.
📝 Page 264
Q1: What is ozone and how does it affect any ecosystem ?
Answer: Ozone (O3) is an isotope of oxygen, i.e., it is a molecule formed by three atoms of oxygen.
At the higher levels of the atmosphere, ozone performs an essential function. It shields the surface of the earth from ultraviolet (UV) radiations from the sun. These radiations are highly damaging to organisms. Ultraviolet rays can cause skin cancer.
Q2: How can you help in reducing the problem of waste disposal ? Give any two methods.
Answer: Reducing the problem of waste disposal is crucial for environmental sustainability. Here are two effective methods to address this issue:
(i) Recycling : The solid wastes like paper, plastics and metals, etc. are recycled.
(ii) Preparation of Compost: Biodegradable domestic wastes such as left over food, fruit and vegetable peels and leaves of potted plants, etc. can be converted into compost by burying in a pit dug into ground.
SEBA Class 10 Science Chapter 15 – Our Environment Textbook Exercise Questions & Solutions | 2026–27
Q1: Which of the following groups contain only biodegradable items?
(a) Grass, flowers and leather
(b) Grass, wood and plastic
(c) Fruit-peels, cake and lime-juice
(d) Cake, wood and grass
Ans: (a) Grass, flowers and leather
Q2: Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat
Ans: (b) Grass, goat and human
Q3: Which of the following are environment-friendly practices?
(a) Carrying cloth-bags to put purchases in while shopping
(b) Switching off unnecessary lights and fans
(c) Walking to school instead of getting your mother to drop you on her scooter
(d) All of the above
Ans: (d) All of the above
Q4: What will happen if we kill all the organisms in one trophic level?
Ans:
Killing all organisms in one trophic level will disrupt the food chain. The previous level would overpopulate due to lack of predators, and the next level would starve due to lack of food, affecting the entire ecosystem.
Q5: Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
Ans:
Yes, the impact will differ. Removal of producers will collapse the whole food chain, while removing top consumers may cause overpopulation of prey. No trophic level can be removed without damaging the ecosystem.
Q6: What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Ans:
Biological magnification is the accumulation of harmful substances (like pesticides) in organisms at higher trophic levels. Yes, the level of magnification increases with each higher trophic level, making top-level consumers most affected.
Q7: What are the problems caused by the non-biodegradable wastes that we generate?
Ans:
Non-biodegradable waste accumulates in the environment, causing land and water pollution, harming wildlife, and entering the food chain, affecting health and ecological balance.
Q8: If all the waste we generate is biodegradable, will this have no impact on the environment?
Ans:
Even biodegradable waste can cause pollution if it accumulates excessively. It may lead to bad odors, attract disease-causing organisms, and create unhygienic conditions if not managed properly.
Q9: Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
Ans:
The damage to the ozone layer is a cause for concern because if the ozone layer in the atmosphere disappears completely, then all the extremely harmful ultraviolet radiations coming from the sun would reach the earth. These ultraviolet radiations would cause skin cancer and other ailments in men and animals and also damage the plants.
Steps to limit this damage include banning ozone-depleting substances like CFCs and promoting eco-friendly technologies (e.g., UNEP’s agreement in 1987 to freeze CFC production).
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