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Solution of Our Environment (Page No - 228 - Biology by Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Question 43:
(a) Define an ecosystem. Give examples of any two ecosystems.
(b) List the biotic and abiotic components of an ecosystem.
Solution :
(a) An eco system is a self contained unit of living things(plants, animals and decomposers), and their non living environment (soil, air and water). Example – a grassland and a forest.
(b)

  1.  Biotic component – The biotic components of the ecosystem is a community of organisms which is made up of many different inter-dependent populations. It includes – producers, consumers and decomposers.
  2. Abiotic components – The abiotic components of the ecosystem (non living components) include the physical environment like soil, water and air alongwith the in organic substances like carbon dioxide, nitrogen, water and phosphorous.

Question 44:
(a) What is a food chain ? Give one example of a simple food chain.
(b) What is a ‘food web’ ? Show its formation.
Solution :
(a) The sequence of living organisms in a community in which one organism consumes other organisms to transfer food energy is called a food chain. The simple food chain operating in grass land is:


Plants          --->    Deer              --->    Lion

(Producer)            (Herbivorse)                    (Carnivorse)


b) The interconnected food chains operating in an ecosystem which establish a network of relationships between various species is called a food web. 

Solution of Our Environment (Page No - 228 - Biology by Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10



In this food web, we can see a network of numerous pathways along which the food flows within grass land community. This food web starts from the plants which is producer and end in top carnivore hawk.

Question 45:
(a) What is meant by ‘environment’ ?
(b) What type of substances are the major pollutants of the environment ? Name two such substances.
(c) Name the organisms whose uncontrolled activities are damaging the environment.
(d) Explain why, it is better to use paper bags than plastic bags.
Solution :
(a)The physical and biological world together is called environment.
(b) The non- biodegradable wastes pollutes the environment like plastic and polythene bags.
(c) Human beings are the only organisms which change the natural environment to fulfill their needs. The uncontrolled activities of human beings are damaging the balanced and healthy environment.
(d) Paper bags should be used for shopping because these are biodegradable whereas plastic bags are non- biodegradable.

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FAQs on Solution of Our Environment (Page No - 228 - Biology by Lakhmir Singh, Class 10 - Extra Documents, Videos & Tests for Class 10

1. What is the importance of our environment?
Ans. Our environment is important because it supports the survival and well-being of all living organisms. It provides us with essential resources such as air, water, food, and shelter. Additionally, a healthy environment helps to maintain a balance in ecosystems and contributes to the overall health and sustainability of our planet.
2. How does pollution affect our environment?
Ans. Pollution has a detrimental impact on our environment. Air pollution, caused by emissions from vehicles and industries, can lead to respiratory problems and damage to the ozone layer. Water pollution, caused by the discharge of harmful chemicals and waste into water bodies, can contaminate drinking water sources and harm aquatic life. Soil pollution, caused by the use of pesticides and improper waste disposal, can degrade soil quality and affect plant growth.
3. What are the main causes of deforestation?
Ans. Deforestation is mainly caused by human activities such as logging, agriculture expansion, and urbanization. Logging involves the cutting down of trees for timber, paper, and other wood products. Agriculture expansion leads to the clearing of forests to make way for crops or livestock. Urbanization involves the conversion of forested land into developed areas for housing and infrastructure.
4. How does climate change affect our environment?
Ans. Climate change has various impacts on our environment. Rising temperatures can lead to the melting of polar ice caps, causing a rise in sea levels and coastal flooding. Changes in precipitation patterns can result in droughts or intense rainfall, affecting agriculture and water availability. Climate change also disrupts ecosystems, leading to the loss of biodiversity and the spread of diseases.
5. What are the solutions to protect our environment?
Ans. To protect our environment, we can take several measures. Firstly, reducing our carbon footprint by conserving energy, using renewable sources, and adopting sustainable practices can help mitigate climate change. Secondly, promoting recycling and reducing waste generation can help minimize pollution and conserve resources. Additionally, preserving and restoring natural habitats, implementing stricter environmental regulations, and raising awareness about the importance of environmental conservation are crucial steps towards protecting our environment.
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