KSEEB SSLC Class 10 Science Solutions Chapter 15 Our Environment are part of KSEEB SSLC Class 10 Science Solutions. Here we have given Karnataka SSLC Class 10 Science Solutions Chapter 15 Our Environment.
Karnataka SSLC Class 10 Science Solutions Chapter 15 Our Environment
KSEEB SSLC Class 10 Science Chapter 15 Intext Questions
Text Book Part I Page No. 140
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Several hierarchical level in an ecosystem are called trophic levels. They are based on following facts:
- Energy and its transportation in form of food from one end to other.
- Biomass balance in ecosystem.
- Food chain of pond is a simple food chain. Example:
Weeds → Small pond animals → Fish (Rohu) → Man → Big fishes
Trophic level of a Pond:
- Producer: Weeds and plants of pond like ‘duck weed’, ‘lotus’ or ‘typha’ are at lowest level or bottom of a pond which produce food for pond animals and energy transfer.
- Primary consumers: Algae, bacteria, Phytoplankton eat producer and conserve the energy in their body.
- Secondary consumers: Fishes, crabs etc. are those which feeds on primary consumers.
- Top consumers: Bigger fishes and humans are top consumers.
What is the role of decomposers in the ecosystem?
Decomposers has very important place in any ecosystem as every ecosystem contains dead and decaying materials which is of no use and most of the time harmful for the system too. Decomposers act over these materials and change or break them to the components easily invisible to the environment. Hence, decomposers act over dead and decayed materials and convert them to the components which can be easily mixed up with other environmental factors.
Text Book Part I Page No. 142
Why are some substances biodegradable and some non-biodegradable?
Substances that are broken down by biological processes are said to be biodegradable. Eg: paper and peel of a fruit. But plastic leather etc. are not broken down. These are called Non-biodegradable.
Give any two ways in which biodegradable substances would affect the environment.
- Leaves of the plants decay and reduces soil fertility,
- Bio-degradable substances have carbon. When this is burnt, CO2 and CO are produced and causes air pollution.
Give any two ways in which non-biodegradable substances would affect the environment.
- As these are not decomposing, they cause air pollution and water pollution.
- Plastic enters stomach of many animals and causes death of animals.
Text Book Part I Page No. 144
What is ozone and how does it affect any ecosystem?
Ozone is an atmospheric gas and its chemical formula is 03. It is formed by the union of three atoms of oxygen.
Formation of Ozone:
1. In the presence of UV rays, oxygen molecules break down to its component or forms to nascent oxygen atom.
2. This oxygen atom combines with another molecule of oxygen and forms ozone molecule.
Effect of Ozone:
Ozone is not good for health or to be consumed as it is poisonous in nature but it plays an important role in environment protection. The living organisms and factors which prevails life at earth, like water and atmospheric gases get distracted by UV rays coming from sun. Ozone forms a layer over our atmosphere and absorb harmful UV rays.
How can you help in reducing the problem of waste disposal? Give any two methods.
(a) Waste disposal and management is a big issue nowadays as new technologies produce many useful products but at the end :t turn to a garbage because all the things are non-biodegradable in nature. Waste management require 3R principle i.e., Reduce, reuse and recycle.
(b) Waste disposal can be managed by:
- Categorizing the waste and disposing accordingly.
- Collecting things which can be recycled after use and send them to recycling units.
- Making manure by unrequired, spoiled and left over food products.
KSEEB SSLC Class 10 Science Chapter 15 Textbook Exercises
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.
(b) Grass, wood and plastic.
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.
(b) Grass, goat and human.
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.
(d) All of the above.
What will happen if we kill all the organisms in one trophic level?
Ecosystem will get disturbed due to killing of organisms in one trophic level:
1. If producers are killed: No energy will be converted to food for primary consumers, so they will die, since primary consumers are not available, secondary and top consumers as well will collapse.
2. If primary consumers are killed: Secondary and top consumers will die immediately in absence of food (in form of primary consumer) and if all fauna will die, population will stop and humans will also be effected in absence of fauna: Similarly, CO2 balance will be reduced and cause depletion of flora,
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?
- No, same effect will be caused and that is disturbance in ecosystem.
- No, there is no way to remove a trophic level organism without harming ecosystem.
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Some non-biodegradable substances (like pesticides) somehow enters the food chain or web and since, they do not get decomposed at any level and get accumulated in the bodies of top level consumers, this phenomenon is called biological magnification.
Yes, at lower level it is lesser and at higher it is more.
What are the pro Problems caused by the non-biodegradable wastes that we generate?
Technological development leads to a better and comfortable life a way and garbage enhancement in other way. We always think of a product which last for long time or a durable product which do not get affected by atmospheric changes like waterproof heat resistance product etc. But after use due to its nature, it do not get degraded and remain garbage for very long time.
Problem generated by garbage:
- They react with other materials and atmospheric gases and form many harmful by products and chemicals.
- Harm the animals which mistakenly eat them.
- Acquire huge land and engage manpower to manage them all the time.
- Pollution rises.
If all the waste we generate is biodegradable, will this have no impact on the environment?
Yes, biodegradable waste will be decomposed with lesser time and its component will be mixed with environment. Hence, it will leave no impact on environment.
Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
Ozone is an atmospheric gas and its chemical formula is O3.
Damage to the ozone layer will lead:
- More UV rays to enter the atmosphere.
- Damage to flora and fauna.
- Diseases to human beings related to exposure to sun.
Damage control. Protection to ozone layer can be initiated by:
- Main reason for ozone layer depletion is pollution. Hence, ceasing pollution is a must to stop the depletion.
- Coolant like CFC must be banned which are considered to be most harmful to ozone layer.
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