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Question 1 of 17

1. Question

Consider the following statements

The normal temperature of human body is 37°C

The clinical thermometer is designed to measure the temperature of human body only

Usually clinical thermometer’s range is limited to 35 °C to 42°C due to the fact that large amount of mercury cannot be accommodated at the tiny end

Which of the above statements is/are correct?

a) 1 and 2 Only

b) 1 and 3 Only

c) 2 and 3 Only

d) All

Correct

Solution: a)

The temperature of every person may not be 37°C. It could be slightly higher or slightly lower. Actually, what we call normal temperature is the average body temperature of a large number of healthy persons. The clinical thermometer is designed to measure the temperature of human body only. The temperature of human body normally does not go below 35o C or above 42oC. That is the reason that this thermometer has the range 35o C to 42o C.

NCERT Class VII Science Chapter – 4

Incorrect

Solution: a)

The temperature of every person may not be 37°C. It could be slightly higher or slightly lower. Actually, what we call normal temperature is the average body temperature of a large number of healthy persons. The clinical thermometer is designed to measure the temperature of human body only. The temperature of human body normally does not go below 35o C or above 42oC. That is the reason that this thermometer has the range 35o C to 42o C.

NCERT Class VII Science Chapter – 4

Question 2 of 17

2. Question

Consider the following statements:

Chloroplasts are not found in all plant cells

Chlorophyll absorbs light most strongly in the green portion of the electromagnetic spectrum, followed by the yellow portion

Which of the following statements is/are correct?

a) 1 Only

b) 2 Only

c) Both

d) None

Correct

Solution: a)

Chloroplasts are the tiny structures in plant cells where photosynthesis happens. Chloroplasts contain chlorophyll, a green pigment that absorbs light energy for photosynthesis. However, chloroplasts are not found in all plant cells. For example, they are not found in root hair cells. These cells absorb the water needed by the plant for photosynthesis. However, since they are usually underground and in the dark, they are unable to photosynthesise anyway.

Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion. Conversely, it is a poor absorber of green and near-green portions of the spectrum, hence the green color of chlorophyll-containing tissues.

NCERT Class VII Science Chapter – 1

Incorrect

Solution: a)

Chloroplasts are the tiny structures in plant cells where photosynthesis happens. Chloroplasts contain chlorophyll, a green pigment that absorbs light energy for photosynthesis. However, chloroplasts are not found in all plant cells. For example, they are not found in root hair cells. These cells absorb the water needed by the plant for photosynthesis. However, since they are usually underground and in the dark, they are unable to photosynthesise anyway.

Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion. Conversely, it is a poor absorber of green and near-green portions of the spectrum, hence the green color of chlorophyll-containing tissues.

NCERT Class VII Science Chapter – 1

Question 3 of 17

3. Question

Consider the following statements:

In plants carbon dioxide is taken in through stomata

Guard cells regulate the rate of transpiration by opening and closing the stomata

4. Question

With reference to carnivorous plants, consider the following statements:

Carnivorous plants have adapted to grow in places where the soil is rich in nutrients, especially nitrogen

The first well-known treatise on carnivorous plants was written by Charles Darwin

Which of the above statements is/are INCORRECT?

a) 1 Only

b) 2 Only

c) Both

d) None

Correct

Solution: a)

Carnivorous plants are plants that derive some or most of their nutrients (but not energy) from trapping and consuming animals or protozoans, typically insects and other arthropods. Carnivorous plants have adapted to grow in places where the soil is thin or poor in nutrients, especially nitrogen, such as acidic bogs and rock outcroppings. Charles Darwin wrote Insectivorous Plants, the first well-known treatise on carnivorous plants, in 1875.

NCERT Class VII Science Chapter – 1

Incorrect

Solution: a)

Carnivorous plants are plants that derive some or most of their nutrients (but not energy) from trapping and consuming animals or protozoans, typically insects and other arthropods. Carnivorous plants have adapted to grow in places where the soil is thin or poor in nutrients, especially nitrogen, such as acidic bogs and rock outcroppings. Charles Darwin wrote Insectivorous Plants, the first well-known treatise on carnivorous plants, in 1875.

NCERT Class VII Science Chapter – 1

Question 5 of 17

5. Question

Consider the following statements:

The mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition

Saprotrophic nutrition is most often associated with fungi and soil bacteria

Which of the above statements is/are correct?

a) 1 Only

b) 2 Only

b) Both

d) None

Correct

Solution: c)

Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of dead or decayed organic matter. It occurs in saprotrophs or heterotrophs, and is most often associated with fungi (for example Mucor) and soil bacteria. Saprotrophic microscopic fungi are sometimes called saprobes; saprotrophic plants or bacterial flora are called saprophytes (sapro- + -phyte, “rotten material” + “plant”).

NCERT Class VII Science Chapter – 1

Incorrect

Solution: c)

Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of dead or decayed organic matter. It occurs in saprotrophs or heterotrophs, and is most often associated with fungi (for example Mucor) and soil bacteria. Saprotrophic microscopic fungi are sometimes called saprobes; saprotrophic plants or bacterial flora are called saprophytes (sapro- + -phyte, “rotten material” + “plant”).

8. Question

With reference to Oral Rehydration Solution, consider the following statements:

It is considered as one of the most important medication needed in a basic health system

It is used to prevent or treat dehydration

The Solution is a mixture of salts and sugars

Which of the above statements is/are correct?

a) 1 and 2 Only

a) 2 and 3 Only

a) 1 and 3 Only

a) All

Correct

Solution: d)

Oral rehydration therapy (ORT) is a fluid replacement strategy used to prevent or treat dehydration. Dehydration is most commonly caused by diarrhea. It involves drinking water with modest amounts of sugar and salt added, while continuing to eat. When diarrhea is severe or long-lasting, the therapy also includes supplemental zinc.

It is on WHO’s List of Essential Medicines, a list of the most important medication needed in a basic health system.

NCERT Class VII Science Chapter – 2

Incorrect

Solution: d)

Oral rehydration therapy (ORT) is a fluid replacement strategy used to prevent or treat dehydration. Dehydration is most commonly caused by diarrhea. It involves drinking water with modest amounts of sugar and salt added, while continuing to eat. When diarrhea is severe or long-lasting, the therapy also includes supplemental zinc.

It is on WHO’s List of Essential Medicines, a list of the most important medication needed in a basic health system.

NCERT Class VII Science Chapter – 2

Question 9 of 17

9. Question

Consider the following statements:

These goats produce the lustrous fibre known as mohair

These goats originated in Turkey and now are bred in many parts of the world including Australia and New Zealand

To which of the following breeds of goat does above description refer ?

a) Pashmina Goat

b) Angara Goat

c) Changthangi Goat

d) Australian Cashmere

Correct

Solution: b)

The Angora goat (Turkish: Ankara keçisi) is a breed of domestic goat that is named for Ankara, Turkey, historically known as Angora. Angora goats produce the lustrous fibre known as mohair.

The most commonly used natural indicator is litmus. It is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. It is available in the form of a solution, or in the form of strips of paper, known as litmus paper. Generally, it is available as red and blue litmus paper blue litmus paper.

Vinegar is nothing but acetic acid, hence it turns red on adding litmus.

NCERT Class VII Science Chapter – 5

Incorrect

Solution: d)

The most commonly used natural indicator is litmus. It is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. It is available in the form of a solution, or in the form of strips of paper, known as litmus paper. Generally, it is available as red and blue litmus paper blue litmus paper.

Vinegar is nothing but acetic acid, hence it turns red on adding litmus.

NCERT Class VII Science Chapter – 5

Question 11 of 17

11. Question

Consider the following statements:

The smoke goes up because the air surrounding it is cold and not lighter

The surface air present at the 30 degrees latitude move towards equator both from north and south latitudes

Which of the above statements is/are correct?

a) 1 Only

b) 2 Only

c) Both

d) None

Correct

Solution: c)

NCERT Class VII Science Chapter – 8

Incorrect

Solution: c)

NCERT Class VII Science Chapter – 8

Question 12 of 17

12. Question

With reference to physical exercise and its effects, consider the following statements

The increase in the supply of oxygen results in the complete breakdown of lactic acid into carbon dioxide and water resulting in relief from cramps

Which of the above statements is/are correct?

a) 1 and 2 Only

b) 2 and 3 Only

c) 3 Only

d) 2 Only

Correct

Solution: b)

The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps. We get relief from cramps after a hot water bath or a massage. Hot water bath or massage improves circulation of blood. As a result, the supply of oxygen to the muscle cells increases. The increase in the supply of oxygen results in the complete breakdown of lactic acid into carbon dioxide and water.

NCERT Class VII Science Chapter – 10

Incorrect

Solution: b)

The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps. We get relief from cramps after a hot water bath or a massage. Hot water bath or massage improves circulation of blood. As a result, the supply of oxygen to the muscle cells increases. The increase in the supply of oxygen results in the complete breakdown of lactic acid into carbon dioxide and water.

NCERT Class VII Science Chapter – 10

Question 13 of 17

13. Question

Seeds of which of the following plants are likely to be dispersed by animals to different places?

Drumstick

Maple

Xanthium

Urena

Choose the correct answer using the codes below:

a) 1 and 2 Only

b) 3 and 4 Only

c) 1,3 and 4 Only

d) All

Correct

Solution: b)

NCERT Class VII Science Chapter – 12

Incorrect

Solution: b)

NCERT Class VII Science Chapter – 12

Question 14 of 17

14. Question

With reference to aquifers, consider the following statements:

They are hard and impermeable

Water in the aquifers can be usually pumped out with the help of tube wells or handpumps

Which of the above statements is/are correct?

a) 1 Only

b) 2 Only

c) Both

d) None

Correct

Solution: b)

NCERT Class VII Science Chapter – 16

Incorrect

Solution: b)

NCERT Class VII Science Chapter – 16

Question 15 of 17

15. Question

With reference to smallpox consider the following statements

It is an acute contagious disease caused by the variola virus

It is completely eradicated globally

It was transmitted from person to person via infective droplets during close contact with infected symptomatic people