Question

Q-5 Answer the following in one sentence (5×1=5)

1. Mention any one function of lysosome.

2. Write any two conditions necessary for combustion to take

place.

3. Why is white phosphorous stored in water ?

4. Define food preservation.

5. What is known as altitude?

Q-6

A. Complete the given paragraph (4×0.5=2)

In _____ , Robert Hooke discovered the cell. He observed

slice of cork under a _______. He draw what he could see

and published the pictures in a book called ________ . He

gave the term _____ to each box.

B. State true or false . Rewrite the false statements correctly

(3×1=3)

1. Crop rotation reduces soil fertility.

2. A good fuel has high calorific value.

3. Cell membrane is a thin porous membrane that separates

the nucleus from cytoplasm​

Answer 1

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★ Answer the following in one sentence

1. Mention any one function of lysosome.

• Lysosome protect the cell by engulfing and destroying bacteria and other unwanted particles.

2. Write any two conditions necessary for combustion to take place.

1. A combustible substance is present
2. Oxygen is present in air

3. Why is white phosphorous stored in water ?

• Because it bursts in moist air and also that it is very poisonous.

4. Define food preservation.

• Food preservation is the process to prevent its spoilage and to retain its nutritive value for long time.

5. What is known as altitude?

• Altitude is simply the height of a particular object or thing.

_______________________________________

★ Complete the given paragraph :

In 1665 , Robert Hooke discovered the cell. He observed slice of cork under a microscope. He draw what he could see and published the pictures in a book called Micrographia. He gave the term cell to each box.

________________________________________

★ State true or false . Rewrite the false statements correctly :

1. Crop rotation reduces soil fertility.

• True

2. A good fuel has high calorific value.

• True

3. Cell membrane is a thin porous membrane that separates the nucleus from Cytoplasm

• False. Nuclear membrance is a thin porous membrance that separates the nucleus from cytoplasm.

_______________________________________