Evaluation
I. Choose the appropriate answer
1. Identify the fresh water ecosystem.
a. Pond
b. Lake
c. River
d. All of them
Answer: d) All of them
2. Producers
are_______________
a. Animals
b. Birds
c. Plants
d. Snakes
Answer: c) Plants
3. It is a
biodegradable waste.
a. Plastic
b. Coconut Shell
c. Glass
d. Aluminium
Answer: b) Coconut Shell
4. It is an
undesirable change that occurs in air and water.
a. Recycling
b. Reuse
c. Pollution
d. Reduce
Answer: c) Pollution
5. Usage of
chemical pesticides and fertilisers causes ________ pollution.
a. Air pollution
b. Water pollution
c. Noise pollution
d. None of the above
Answer: b) water pollution
II. Fill in the
blanks
1. Primary consumers that eat plants are called
__________.
2. Temperature, light and wind are ________
factors.
3. __________ is the process of converting
waste materials into new materials.
4. Water pollution can spread __________ and
chemicals.
5. The 3R’s are Reduce, __________ and Recycle.
III. True or
False. If False, give the correct statement
1. The Pacific ocean is an example of an
aquatic ecosystem.
2. Bacteria and fungi are called decomposers.
3. Human and animal wastes are examples of
non-biodegradable waste.
Human and animal wastes are examples of biodegradable waste.
4. Excessive use of pesticides leads to air
pollution.
Excessive use of pesticides
leads to land pollution and water pollution.
5. In schools, waste management rules say that
we should separate waste in two categories.
IV. Match the
following
1. Biotic factor – Terrestrial Ecosystem
2. Sewage - Land pollution
3. Fertilizers - Air pollution
4. Desert - Water Pollution
5. Smoke – Animals
Answer:
1. Biotic factor - Animals
2. Sewage - Water Pollution
3. Fertilizers - Land
pollution
4. Desert - Terrestrial
Ecosystem
5. Smoke - Air pollution
V. Arrange the
following in a correct sequence and form a food chain
1. Rabbit →
Carrot → Eagle → Snake
Carrot → Rabbit → Snake → Eagle
2. Human → Insect
→ Algae →
Fish
Algae → Insect → Fish→ Human
VI. Give very
short answer
1. Define
ecosystem.
Ecosystem is a community of
living and non-living things that work together.
2. What are
the two types of ecosystems?
Ecosystems can be either natural or artificial.
3. Write any
two things that can be recycled.
(i) We can use old clothes to make paper
(ii) Some plastics can be used to make floor mats, plastic boards
and hose pipes.
4. What are
the types of pollution.
1. Airpollution
2. Water pollution
3. Land (soil) pollution
4. Noise pollution
5. Give one
example of a food chain in an aquatic ecosystem?
Aquatic plant → Aquatic insect
→ Larva → Fish
6. Name some
pollutants.
Any substance that causes pollution is called a pollutant.
e.g: smoke, fume, chemical
residues, plastic waste.
7. What are
the pollutions caused by the objects given below?
a. Loud
Speaker b. Plastic
a. Loud Speaker
Noise pollution
b. Plastic
Land pollution
VII. Give short answer
1. What is
biodegradable waste?
The term 'Biodegradable' is used for those things that can be easily
decomposed by natural agents like water, oxygen, ultraviolet rays of the sun, micro-organisms,
etc.
One can notice that when a dead leaf or a banana peel is thrown outside,
it is acted upon by several micro-organisms like bacteria, fungi or small insects
in a time period. Biodegradable waste includes vegetable and fruit peels, leftover
food and garden wastes (grass, leaves, weeds and twigs).
2. How can we reduce water pollution?
1. Do not pour leftover oil, old medicines or waste down the drain
or into the toilet.
2. Reduce the use of chemical pesticides and fertilizers to grow
crops.
3. Use waste water for garden in home.
4. Do not litter or dump waste - always use a waste bin.
3. Write the importance of the food chain.
1. Learning food chain helps us to understand the feeding relationship
and interaction between organisms in any ecosystem.
2. Understanding the food chain also helps us to appreciate the energy
flow and nutrient circulation in an ecosystem. This is important because pollution
impacts the ecosystem. The food chain can be used to understand the movement of
toxic substances and their impacts.
VIII. Answer in detail
1. Give two examples of how you can avoid or
reduce waste?
1. Avoid : Avoid the usage of unwanted materials which create more debris.
Before you buy anything, think that "Do I really need it?" (e.g) Avoid
buying packaged foods. Refuse to buy use and throw plastic products.
2. Reduce : We can reduce the waste by using durable goods that last longer
instead of things that are used once and thrown away, (e.g) Write on both sides
of papers. Instead of unnecessary printing, use electronic facilities. Share newspapers,
magazines and other things with others.
2. Write a short note on noise pollution.
Noise pollution affects the environment. We all like a quiet and
peaceful place since unpleasant or loud sounds disturb us. Loud music, the sounds
of motor vehicles, fire works and machines cause noise pollution. Continuous noise
disturbs our sleep and does not let us to study. Noise pollution has been directly
linked to stress and health impacts such as high blood pressure and hearing loss.
Loud noise or even loud music can damage our ears. Noise pollution also disturbs
animals. Birds have to communicate (talk) louder so that, they can hear each other
in noisy areas. Even underwater noise pollution from ships, can make whales lose
their way as they use sounds to navigate.
IX. Question based on Higher Order Thinking Skills
1. What would happen if an organism is removed
from the food chain?
When an organism is removed from the food chain there occurs a break
in the transmission of energy. Some species do not get food and they become extinct.
The other species which depend on them also become extinct. Thus it leads to the
death and annihilation of many plants and animals on earth.
2. Explain the
link between waste and dangerous diseases like dengue and malaria?
The soil gets polluted by plastic wastes. These plastic wastes are
non- biodegradable. They prevent the infiltration and percolation of rain water.
As a result the rain water stagnates on the soil. It creates ditches which become
a breeding spot for flies and mosquitoes. They breed in these ditches in abundance
and spread dangerous diseases like malaria and dengue.
X. See the
diagram and answer the following questions
1. Explain what is happening in the picture?
This is the picture of an open dump. Here the waste is dumped and
burned. The smoke that comes out causes air pollution by liberating toxic gases
into the atmosphere. Moreover the toxic chemicals in the waste leak into the soil
and water and pollute them.
2. What types of pollution are caused by open
dumps?
Air pollution is caused by the smoke and fumes that go into the air.
Land pollution and water pollution are caused by the leakage of toxic chemicals
into the soil.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.