Select from the following a group of diseases caused by bacteria

• Malaria, Polio and Typhoid

• Chickenpox, Meningitis and Tuberculosis

• Tuberculosis, Pneumonia and Typhoid

• Chickenpox, Influenza and Polio

Consider the following Column A and Column B in which the names of micro-organisms are given in Column A and the groups to which they belong are given in Column B

Column A

1. Aspergillus
2. Lactobacillus
3. Paramecium
4. Spirogyra

Column B

1. Algae
2. Bacteria
3. Fungi
4. Protozoa
5. Virus

The correct match of the items of Column A with that of Column B is

• A: III

  B: II

  C: IV

  D: I

• A: V

  B: III

  C: II

  D: IV

• A: III

  B: II

  C: IV

  D: V

• A: II

  B: III

  C: IV

  D: I

3.

Which of the following statements are true about veins in the human circulatory system?

1. All veins carry carbon dioxide-rich blood.

2. Veins have thin walls.

3. Veins carry blood from different organs to the heart.

• B and C

• A and C

• All of these

• A and B

Cellulose-rich food substances (i.e., roughages) are considered an essential component of a balanced diet of human beings. Which one of the following is the correct statement about cellulose?

• Human beings do not have cellulose-digesting enzymes

• Cellulose is a type of carbohydrate, which gets absorbed in the human blood and gives energy

• Cellulose breaks down easily into smaller components which are egested as roughages

• The cellulose-digesting bacteria present in human beings convert cellulose into fibres

The joint between the head and the upper jaw is an example of

• pelvic joint

• fixed joint

• ball and socket joint

• hinged joint

Identify the correct statement(s).

1. The freshwater stored in-ground is less than that present in the rivers and lakes of the world.
2. Water shortage is a problem faced by people only in rural areas.
3. Water from rivers is the only source for irrigation in the fields.
4. Rain is the ultimate source of freshwater.

• A and B

• A, B and C

• Only D

• A and C

The assessment in science should focus on

• getting accurate results while conducting the experiments

• the ability to make neat and clear diagrams

• the understanding of concepts and processes

• precise definitions and correct answers

Which of the following makes) good open-ended question(s)?

• What difficulties would we face if our bodies did not have muscles in them?

• What is the difference between the stem of a rose plant, mango tree, and tulsi?

• Snake and snail have very different styles of movement. Why is it so?

• Observe various roots and write their features.

Read the following which appears in the Class VIII NCERT textbook.

Nylon appears like silk. It is strong and flexible. These endearing qualities of nylon created a public sensation, or nylon mania when it was introduced in 1939. Women's stockings made from this new fiber were in great demand. But, unfortunately, most of the nylon productions had to be diverted to making parachutes during the Second World War (1939-1945). After the War, when the production of stockings resumed, supply did not match the demand. There was a huge black market for this product. Women had to wait for hours in queues to get a pair. Often there were 'nylon riots'.

What are the significances of including the above in a science textbook?

1. To develop a historical perspective in science and the development of ideas.
2. To develop an appreciation of how new inventions create new demands.
3. To develop a holistic understanding of science.
4. Including such anecdotes makes science textbook light and easy.

• B and C

• A and D

• A, B and C

• A and C

Sometimes the students have alternative conceptions related to various science concepts. What should the science teacher do?

• Ignore their ideas

• Help the students revisit their ideas through various activities

• Scold the students for having non-scientific ideas

• Tell the students that their ideas are 'wrong' and teach them the correct concept