Page 182 - Science Class 07

B. Fill in the blanks.

1. During the process of photosynthesis, the leaves synthesise food in the form of
_______________ and oxygen is released.

2. Permanent teeth in men are ____________ in numbers.
3. Silk is an important and ____________ fibre.

4. The Kelvin scale was designed by ____________ in 1848.
5. ____________ , which is commonly used spice, is used as indicator.
C. Write True or False.

1. Glucose is converted into starch by plants.
2. The heterotrophs are usually free-living and have holozoic mode of nutri on.

3. To remove silk from the cocoons, they are put into hot water.
4. All the objects on the earth have certain amount of heat.
D. Write the effects of acid and base on the following indicators.

Indicator Acid Base

1. Blue/Red litmus
2. Methyl orange
3. Phenolphthalein

E. Very short answer ques ons.
1. What is nutri on?

2. What is assimila on?
3. What do you mean by fibres?
4. What happens when we heat water?
5. Name any three weak acids.

F. Short answer ques ons.
1. Write the importance of photosynthesis.
2. What is diges ve tract?

3. How do we obtain silk?
4. What is a conduc on?
5. What is a molecule?
G. Long answer ques ons.
1. What is the importance of clothing in our daily life?

2. Give two main uses of each– hydrochloric acid and nitric acid.
3. Describe breathing with diagram.
4. Explain respira on with diagram.

5. Describe adap ve features of the animals found in very cold region.

182 Science-7