Olympiad Science - Resources on Earth - Forests and Ecosystems
Exam Duration: 45 Mins Total Questions : 30
Which of the following statements is incorrect?
- (a)
Some bacteria and fungi absorb nutrients from dead plants and animals
- (b)
Snails, millipedes, termites and woodlice are decomposers.
- (c)
Decomposers break down dead matter and wastes into minerals
- (d)
Mould can cause food to decay
Snails, Millipedes, termites and woodlice feed only on dead and decaying matter and they don't help in decomposition of dead and decaying matter
Which of the following is NOT a consequence of deforestation?
- (a)
Increased levels of ground water
- (b)
Removalof the top layerofsoil bywind
- (c)
Increased levels of carbon dioxide in the atmosphere.
- (d)
Destruction of the natural habitats of plants and animals
Increased levels of ground water is due to heavy rainfall
What is the name of the process 'X' in the figure
- (a)
Respiration
- (b)
Breathing
- (c)
Feeding
- (d)
Photosynthesis
In the given figure X represents respiration.
Which statement describes a food web?
- (a)
It is made up of an extra long food chain
- (b)
It is a food chain with goat as a consumer
- (c)
It is a food chain with man as the final consumer
- (d)
It is made up of many interconnecting food chains
A food web is made up of many inter connecting food chains.
Which of the following gases is increased in air in the absence of forests
- (a)
Oxygen
- (b)
Nitrogen
- (c)
Carbon dioxide
- (d)
Hydrogen
Plants take in carbon dioxide from the air to synthesis its food
Study the given diagram
Which of the following components is exchanged by plants and animals for their life processes to take place
- (a)
Space
- (b)
Gases
- (c)
Water
- (d)
Nutrients
The given figure represents exchange of gases
Which of the following organisms are called decomposers
(i) Ants (ii) Bacteria (iii) Fungi (iv) Worms |
- (a)
(i) and (ii) only
- (b)
(ij) and (iii) only
- (c)
(i), (ii) and (iii) only
- (d)
(ii), (iii) and (iv) only
Bacteria and fungi are called decomposers.
Which of the following groups consists of a decomposer, a producer and a predator respectively
- (a)
Grass, goat and eagle
- (b)
Mould, sugarcane and lizard
- (c)
Papaya plant, caterpillar and bird
- (d)
toad stool, rotting log and earth-worm.
Mould is a decomposer, sugarcane is a producer and a lizard is a predator
Observe the qiven diaqram of tree
Which of these statements best explains the shape of the given tree?
- (a)
Trees that have very thick trunk have such crowns
- (b)
The branches spread out so that they receive enough sunlight and can be home to any animals
- (c)
The leaves are spread out not to receive as much sunlight as possible
- (d)
The branches spread the leaves so as to protect trees from predators
The branches spread out so that they can be home for many animals
Which of the following trees would be most suitable for growing along a walkway?
- (a)
A and C
- (b)
A and B
- (c)
Band C
- (d)
A and D
Tree labelled 'D' and 'A'are most suitable to grow along a road to provide shade and shelter
Which of the following are the two components of an ecosystem
- (a)
Plants and animals only
- (b)
Trees and fungi only
- (c)
Living and nonliving
- (d)
Frogs and man only
An ecosystem has living and non living components
When we destroy a forest which of the following is destroyed
- (a)
An ecosystem
- (b)
The plant life only
- (c)
Population of wild life only.
- (d)
Food and shelter of wild animals only
When we destroy a forest, we destroy an ecosystem.
What does the diagram given below represent?
- (a)
The life cycle of grass
- (b)
A population
- (c)
Animals living in a habitat
- (d)
A food chain
The diagram given below represent a food chain.
Which of the following plays an important role in causing rainfall
- (a)
Animals
- (b)
Plants
- (c)
Factories
- (d)
Vehicles
Due to transpiration water is evolved by plants, water from ponds and rivers evaporate in the form of water vapour. Transpiration from plants and evaporation cause rainfall.
Which of the following should come in the empty box in the food chain given below?
- (a)
- (b)
- (c)
- (d)
In the given food chain producer is missing
Which of the following might happen if plants stop releasing oxygen into the atmosphere?
- (a)
Plants will be more healthier
- (b)
Number of plants will increase
- (c)
Number of animals will increase
- (d)
Living organisms will die due to the lack of oxygen
Plant and animals are interdependent
In nature there is an interdependence between plants and animals for food, oxygen and carbon dioxide. Which of the following conclusions is true about the given statement?
- (a)
Some day all the oxygen will be used up by the animals
- (b)
Some day all the carbon dioxide will be used up by the plants
- (c)
The amount of oxygen is increasing and that of carbon dioxide is decreasing in our atmosphere
- (d)
The level of oxygen and carbon dioxide in the atmosphere is kept constant
The level of oxygen and carbon dioxide is kept constant due to the maintenance of balance between animals and plants.
Which process in plants is responsible for the release of oxygen
- (a)
Respiration
- (b)
Digestion
- (c)
Photosynthesis
- (d)
Reproduction
During the process of photosynthesis carbon dioxide is taken in to synthesise its food and release oxygen.
Which of the following converts the dead plants and animals into minerals?
- (a)
Chemicals
- (b)
Scavengers
- (c)
Decomposers
- (d)
Consumers
Decomposers convert dead organic matter into minerals
What is the bird called in the given food chain?
\(Grass~ \rightarrow Grasshoppers\rightarrow ~ Birds~ \rightarrow Snakes\) |
- (a)
Producer
- (b)
Parasite
- (c)
Decomposer
- (d)
Consumer
In the given food chain bird is a consumer
Which ofthe following statements is NOT correct
- (a)
Forests protects the soil from erosion
- (b)
Pants and animals in a forest are dependent on one another
- (c)
Forest do not influence the climate and water cycle
- (d)
Soil helps the forests to grow and regenerate
Forests influence the climate and water cycle
Water vapour is returned to the atmosphere through which of the following processes
(i) Respiration carried out by living organisms. (ii) Transpiration carried out by living organisms. (iii) The evaporation of water from ponds, lakes and seas |
- (a)
(i) only
- (b)
(ii) and (iii) only
- (c)
(i) and (iij) only
- (d)
(i), (ij) and (iij
Water vapour is returned to the atmosphere through transpiration, respiration and by evaporation of water.
A balanced and stable ecosystem is created through which of the following options?
- (a)
By the natural cycles only
- (b)
By the interactions between animals only
- (c)
By the interactions between organisms and the environment
- (d)
By the interactions between plants and animals only
The balance in nature in which a balanced and stable ecosystem is created through interactions between plants, animals and the environment
Which of the following must be practised to preserve and conserve the environment
- (a)
Deforestation
- (b)
Recycling and afforestation
- (c)
Soil erosion
- (d)
Increase in pollution
Materials like paper, and some natural resources can be recycled to preserve and conserve the nature
Plants and ani~als maintain the balance of oxygen and carbon dioxide in the air
Which of the following processes I represents X and Y
- (a)
X Y Respiration Transpiration - (b)
X Y Transpiration Decay - (c)
X Y Photosynthesis Respiration - (d)
X Y Decay Photosynthesis
In the given cycle X-photosynthesis, Y-respiration
In any food chain the largest population is that of which of the following organisms
- (a)
Producers
- (b)
Consumer
- (c)
Decomposers
- (d)
Parasite
Producers are green plants. Green plants are the largest population in any food chain
Chipko movement is concerned with which of the following processes
- (a)
Conservation of natural resources
- (b)
Plant/forest conservation
- (c)
Plant hybridization
- (d)
Environmental pollution
Chipko movement is concerned with plant/forest conservation
Under which headings can flora and fauna be considered
- (a)
Renewable and non-living resources
- (b)
Non-renewable and living resources
- (c)
Living resources.
- (d)
Non-renewable and non-living resources
Flora and fauna are renewable living resources
Which of the following are called green lungs
- (a)
Mountains
- (b)
Oceans
- (c)
Forests
- (d)
Rivers
Forests are called green lungs. Forests take in carbon dioxide and give out oxygen and maintains a balance of these gases in the atmosphere
Which statement is correct
- (a)
Plants and animals in a forest do not depend on one another
- (b)
Forests has no influence on the climate and water cycle.
- (c)
Forests protect the soil from erosion
- (d)
Soil has no influence on plants
Forests protect the soil from erosion. Roots bind the soil and prevent the top soil from erosion by water and wind.