Samacheer Kalvi 6th Science Term 2 Unit 4 Book Back Questions and Answers:

Samacheer Kalvi 6th Standard Science Book Back 1 Mark and 2 Mark Question & Answers uploaded online and available PDF for free download. Class 6th New Syllabus Science Term 2 book back question & answer solutions guide available below for English Medium. Class sixth Std Science English Medium Term 2 Unit 4 Air book back answers are given below. Students looking for class 6th Term II Unit 4 Chemistry Questions and Answers can check below.

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Samacheer Kalvi 6th Science Book Back Chapter 4 Term 2 Solution Guide PDF:

TN State Board Class 6th Science Subject Term 2 Unit 4 one mark and two mark solutions guide PDF available below.

6th Science – Term 2

Unit 4 – Air

I. Choose the appropriate answer:

1. _______ is the percentage of nitrogen in air.
(a) 78%
(b) 21%
(c) 0.03%
(d) 1%
Answer: (a) 78%

2. Gas exchange takes place in plants using …………
(a) Stomata
(b) Chlorophyll
(c) Leaves
(d) Flowers
Answer: (a) Stomata

3. The constituent of air that supports combustion is _______
(a) Nitrogen
(b) carbon-di-oxide
(c) Oxygen
(d) water vapor
Answer: (c) Oxygen

4. Nitrogen is used in the food packaging industry because of it …………
(a) provides colour to the food
(b) provides oxygen to the food
(c) adds proteins and minerals to the food
(d) keeps the food fresh
Answer: (d) keeps the food fresh

5. _______ and _______ are the two gases, which when taken together, make up about 99 percentage of air.
I. Nitrogen
II. carbon-di-oxide
III. Noble gases
IV. Oxygen
(a) I and II
(b) I and III
(c) I and II
(d) I and IV
Answer: (d) I and IV

II. Fill in the blanks:

1.  _______ is the active component of air.
2. The gas given out during photosynthesis is _______
3. _______ gas is given to the patients having breathing problems.
4. _______ can be seen moving in a beam of sunlight in a dark room.
5. _______ gas turns lime water milky.

Answers:

1. Oxygen
2. Oxygen
3. Oxygen
4. Dust particles
5. Carbon-di-oxide

III. True or False. If False, give the correct statement:

1. Inhaled air contains a large amount of carbon-di-oxide.
Answer:
False, Inhaled air contains a large amount of Oxygen.

2. Planting trees help in decreasing global warming.
Answer: True

3. The composition of air is always exactly the same.
Answer:
False, The composition of air changes slightly place to place.

4. Whales come up to the water surface to breathe in oxygen.
Answer: True

5. The balance of oxygen in the atmosphere is maintained through photosynthesis in animals and respiration in plants.
Answer: False. The balance of oxygen in the atmosphere is maintained through photosynthesis in plants and respiration in animals.

IV. Match the following:

Question 1.

Answer:

V. Arrange the following statements in the correct sequence.

Question 1.

1. Plants manufacture food through a process called photosynthesis.
2. Plants require energy for their growth.
3. Plants take in oxygen and release carbon-di-oxide just as animals.
4. Plants take carbon-di-oxide from the atmosphere, use chlorophyll in the presence of sunlight, and prepare food.
5. Such oxygen is available to animals and human beings for breathing.
6. During this process, oxygen is released by plants.

Answers:

1. Plants manufacture food by a process called photosynthesis.
2. Plants require energy for their growth.
3. Plants take in oxygen and release carbon dioxide just as animals.
4. Plant take carbon dioxide from the atmosphere use chlorophyll in the presence of sunlight and prepare food.
5. Such oxygen is available to animals and human beings for breathing.
6. During this process, oxygen is released by plants.

VI. Analogy:

1. Photosynthesis : _______ :: Respiration : Oxygen.
Answer:
Carbon – dioxide.

2. 78% of air : Does not support combustion :: ________ : Supports combustion
Answer:
21% of air.

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