Deoxygenated blood enters the heart through

1

(a)

Right ventricle

(b)

Right atrium

(c)

Light ventricle

(d)

Left atrium

Complete digestion of carbohydrates, proteins and fats takes place in

1

(a)

Stomach

(b)

Large intestine

(c)

Small intestine

(d)

Villi

Tiny pores present on the surface of the leaf are called

1

(a)

Stomata

(b)

Guard cells

(c)

Chloroplast

(d)

None of these

From the list given below pick the item that is not a natural resource

1

(a)

Soil

(b)

Water

(c)

Electricity

(d)

Air

Given below are a few statements related to biodiversity. Pick those that correctly describe the concept of biodiversity
(i) Biodiversity refers to the different species of flora and fauna present in an area
(ii) Biodiversity refers to only the flora of a given area
(iii) Biodiversity is greater in a forest
(iv) Biodiversity refers to the total number of individuals of a particular species living in an area 

1

(a)

(i) and (ii)

(b)

(ii) and (iv)

(c)

(i) and (iii)

(d)

(ii) and (iii)

Describe double circulation in human beings. Why is it necessary?

1

(a)

What do the following transport?
(a)Xylem
(b)Phloem
(c)Pulmonary vein
(d)Pulmonary artery

2

(a)

Name the following:
(i)The process in plants that links light energy with chemical energy
(ii)Organisms that can prepare their own food
(iii)The cell organelle where photosynthesis occurs
(iv)Cells that surround a stomatal pore
(v)Organisms that cannot prepare their own food
(vi)An enzyme secreted from gastric glands in stomach that acts on proteins.

2

(a)

Differentiate between an artery and vein.

2

(a)

What is the significance of the emulsification of fats?

2

(a)

Why does absorption of digested food occur mainly in the small intestine?

2

(a)

Why is transpiration important for plants?

2

(a)

Write one function of each of the following components of the transport system in human beings:
(a) Blood vessels
(b) Blood platelets
(c) Lymph
(d) Heart

2

(a)

List two vital functions of the human kidney.Name the procedure used in the working of artificial kidney.

2

(a)

Draw the human heart and label the following on it:
(i)Aorta,
(ii)Coronary,
(iii)pulmonary trunk and
(iv)superior vena cava.

2

(a)

Point out two differences between an artery and vein.

2

(a)

Though your uncle has two cars, his son who is your classmate comes with you in school bus. What character of uncle would you appreciate?

2

(a)

Why do you think there should be an equitable distribution of resources? What forces would be working against an equitable distribution of our resources?

2

(a)

Suggest a few measures for controlling carbon dioxide levels in the atmosphere.

2

(a)

State two reasons each of conserving (a) forest and (b) wildlife.

2

(a)

What is water harvesting? Mention any two water harvesting structures.

2

(a)

Suggest three ways to maintain a balance between environment and development to survive.

2

(a)

State two reasons each of conserving (a) forest and (b) wildlife.

2

(a)

What is water harvesting? Mention any two water harvesting structures.

2

(a)

Why must we conserve our forests? List any two cause for deforestation to take place.

2

(a)

List any four advantages of water harvesting.

2

(a)

What is 'Chipko Movement'? Why should we conserve forest?

2

(a)

Suggest any four changes that you would like to incorporate in the life style of students of your age to move towards a sustainable use of available resources.

2

(a)

An environmentalist on visit to your school suggested the use of three R's to save the environment. Explain what he meant by three R's and how you would follow his advice at home.

2

(a)

How do advantages of exploiting natural resources with short-term aims differ from the advantages of managing our resources with a long-term perspective?

2

(a)

What is wildlife? How is wildlife important for us?

2

(a)

List any two causes of our failure to sustain availability of underground water.

2

(a)

What is meant by exploitation of resources with short-term aims? List its four advantages.

2

(a)

What is a dam? Write two main advantages and two ill-effects of construction a big dam.

2

(a)

What is meant by sustainable management. The environmentists are insisting upon "sustainable natural resource management". State its four advantages.

2

(a)

State any four personal choices you would like to make to reduce energy consumption without affecting the quality of life or work explaining how each one of them would help you to do so.

2

(a)

Name any four categories of people who depend on the forest resources, mentioning major needs of each category.

2

(a)

What are non-renewable resources of energy? Give two examples of such resources.

2

(a)

List any four disadvantages of using fossil fuels for the production of energy.

2

(a)

List any four characteristics of a good fuel.

2

(a)

Give two examples each of the following:
(1) Renewable sources of energy
(2) Non-renewable sources of energy.

2

(a)

Define:
(1) Biomass
(2) Anaerobic degradation.

2

(a)

What is an equitable distribution of resources in a society and why is it necessary? State any two factors which work against an equitable distribution of resources.

2

(a)

List four advantages of water stored in the ground.

2

(a)

"Burning fossil fuels is a cause of global warming". Justify this statement.

2

(a)

List three problems which arise due to construction of big dams. suggest a solution for these problems.

2

(a)

List the products of combustion of fossil fuels. What are their adverse effects on the environment?

2

(a)

State the meaning of "sustainable management'. Reduce is better than recycling. How?     

2

(a)

"Reuse is better than recycling of materials". Give reason to justify this statement.

2

(a)

Why are forests considered "biodiversity hot spots"? List two ways in which an individual can effectively contribute to the management of forests and wildlife.

2

(a)

How did 'Chipko Andolan' ultimately benefit the local people? Describe briefly.

2

(a)

Which of the two is a better option, (i) to collect rainwater in ponds or artificial lakes, or (ii) to it recharge groundwater by water harvesting ? List two advantages of the option to justify your answer.

2

(a)

List four advantages of properly managed watershed management.

2

(a)

What is meant by "sustainable management"? Why is reuse considered better than recycling?

2

(a)

(a) Why do we need to manage our resource carefully?
(b) Why management of natural resources requires a long-term perspective?

2

(a)

List four measures that can be taken to conserve forests.

2

(a)

List two advantages associated with water harvesting at the community level.

2

(a)

Water is a valuable resource. List two ways that you would suggest every family member to save this resource.

2

(a)

Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues. State the reason to explain how and why it happens?

2

(a)

List two environment-friendly practices or habits which need to be followed by every member of a family/community. Explain how these practices will support the "save the Environment" mission.

2

(a)

"We need to manage our resources". List two reasons to justify this statement.

5

(a)

List two measures that you would suggest for the better management of water resources.

5

(a)

We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realise that the improper disposal of waste is harmful to the environment.

5

(a)

Every one of us can do something to reduce our consumption of various natural resources. List four such activities based on 3-R approach.

5

(a)

(a) List any two characteristics of a good fuel.
(b) What are non-renewable resources of energy? Give two examples of such resources.

5

(a)

How are oxygen and carbon dioxide transported in human beings? How are lungs designed to maximize the area for exchange of gases?

5

(a)

Write the functions of the following in the digestive process:
(i)Bile
(ii)Bicarbonate secreted by the duodenum
(iii)Pancreatic amylase

5

(a)

Give reasons for the following:
(i)The glottis is guarded by epiglottis
(ii)The lung alveoli are covered with blood capillaries.
(iii)The wall of trachea is supported by cartilage rings.

5

(a)

What is 'translocation'? Why is it essential for plants?Where in plants are the following synthesized:
(i)Sugar  (ii)Hormones

5

(a)

Name the constituents of blood.Why white blood corpuscles are called 'soldiers of the body'?

5

(a)

How 'respiration' different from 'breathing'? Explain the processes of 'aerobic' respiration and 'anaerobic' respiration.

5

(a)

Describe the alimentary canal of man.

5

(a)

(a)Draw the respiratory system of human beings.
(b)Label the following on the diagram drawn: Larynx, Trachea, Primary Bronchus, Lungs
(c)What happens to the carbon dioxide which collects in human tissues?

5

(a)

Explain the process of 'photosynthesis' in plants.List four factors which influence this process and describe how each of them affects the rate of the photosynthesis process.

5

(a)

Define the terms 'nutrients' and 'nutrients'.List two differences between 'Holozoic nutrition' and 'Saprophytic nutrition'.Give two examples of each of these two types of nutrition.

5

(a)

Suggest a few useful ways of utilising waste water.

5

(a)

What is the importance of forest as a resource?

5

(a)

Why are the Arabari forests of Bengal known to be a good example of conserved forest?

5

(a)

Explain giving example where active involvement of local people lead to efficient management of forest.

5

(a)

Why is Government of India imposing a ban on the use of polythene bags? Suggest two alternatives to these bags and explain how this ban is likely to improve the environment.

5

(a)