21.

The students of Class VII are asked the following question by a teacher.

"Two identical cubes of ice are taken out of a refrigerator. One is crushed and the other is left as it is. It is noticed that the crushed ice melts faster. What could be the reason?"

Which process skill is promoted through this question?

• Observation

• Experimentation

• Hypothesizing

• Controlling variables

A teacher of Class VII demonstrates the following activity in the class.

"A leaf is put in a test tube and spirit is poured over it. Then the test tube is put in a beaker half-filled with water and heated till the leaf is discoloured. The leaf is then taken out and a few drops of iodine are put on it. The leaf turns blue-black in colour."

After this activity, the teacher gives some questions for the assessment of various indicators of learning.

Which of the following would assess 'analysis'?

• What care is taken while pouring the spirit into the test tube?

• What care is taken 'to prevent damage to the leaf?

• What happens to the colour of the leaf when the solution is poured on it?

• Can this test be done without removing chlorophyll?

You want your Class VI students to figure out that the property of solubility of salt in water can be used to separate a mixture of sand and salt. As a supporter of inquiry-oriented pedagogy, you would

• explain different methods of separation of mixtures first and then explain the separation of sand and salt mixture

• provide the mixture of sand and salt to students, ask them to think up different ways of separation and help them in trying out their ideas

• ask students to hypothesise about different ways in which a mixture of sand and salt can be separated and then lead them to the correct answer through detailed explanations

• take a mixture of sand and salt, demonstrate its separation and then ask students to repeat it on their own

Which among the following statements describes the relationship between Science and Technology?

• Technology is a more creative process as compared to Science

• Science is a broader endeavour while Technology is goal-oriented and often locale-specific

• Science is an ancient enterprise but Technology is relatively recent

• Science and Technology proceed independently and in isolation from each other

Which among the following is not a single flower but a group of flowers?

• Rose

• Datura

• China rose

• Sunflower

A bicycle is moving on a straight road at a constant speed. The wheels of the cycle exhibit

• circular and translational motion

• circular, translational and periodic motion

• translational and periodic motion

• circular and periodic motion

Suppose you are a farmer living in a place having black soil. If the climate of your region is warm and you want to grow fiber-yielding plants in your fields, then which of the following would you prefer?

• Coconut

• Rayon

• Jute

• Cotton

Choose the odd one out.

• Egg

• Embryo

• Ovum

• Gamete

The function of saliva is to

• prevent the food from entering the windpipe

• convert starch into sugars

• convert carbohydrates into proteins

• convert starch into fats

Which of the following statements is correct?

• Inhaled air does not contain carbon dioxide

• Both inhaled air and exhaled air contain oxygen

• Exhaled air does not contain oxygen

• Exhaled air does not contain carbon dioxide