DAY – 9: Insights Self Study Guide for Prelims + Mains – 2015
09 June 2015
Following Questions are Based on this TIMETABLE
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NCERT Class VIII Science, Chapter – 5
Multiple Choice Questions Quiz
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Welcome to the New initiative. The following questions are based on the topics we have given in this Timetable. For more challenging question papers (Full Length), please join our Preliminary Exam – 2015 Test Series (Please Click Here for Reviews)
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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?
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
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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?
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
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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
Which of the above statements is/are INCORRECT?
Correct
Solution: d)
NCERT Class VII Science Chapter – 1
http://www.phschool.com/science/biology_place/labbench/lab9/guard.html
Incorrect
Solution: d)
NCERT Class VII Science Chapter – 1
http://www.phschool.com/science/biology_place/labbench/lab9/guard.html
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Question 4 of 17
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?
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
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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?
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”).
NCERT Class VII Science Chapter – 1
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Question 6 of 17
6. Question
Chewing and grinding the food is function of
Correct
Solution: a)
NCERT Class VII Science Chapter – 2
Incorrect
Solution: a)
NCERT Class VII Science Chapter – 2
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Question 7 of 17
7. Question
Consider the following statements:
- Tooth decay is caused by the activities of bacteria
- Tooth decay is caused by the acids released by the breakdown of sugars from the leftover food
Which of the above statements is/are correct?
Correct
Solution: c)
http://www.webmd.com/oral-health/tc/tooth-decay-topic-overview
NCERT Class VII Science Chapter – 2
Incorrect
Solution: c)
http://www.webmd.com/oral-health/tc/tooth-decay-topic-overview
NCERT Class VII Science Chapter – 2
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Question 8 of 17
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?
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
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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 ?
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.
http://en.wikipedia.org/wiki/Changthangi
NCERT Class VII Science Chapter – 3
Incorrect
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.
http://en.wikipedia.org/wiki/Changthangi
NCERT Class VII Science Chapter – 3
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Question 10 of 17
10. Question
With reference to litmus, consider the following statements:
- Natural litmus is extracted form lichens
- When litmus is added to an acidic solution, it turns red
- When litmus is added to a basic solution, it turns blue
- If litmus is added to vinegar solution, it turns blue
Which of the above statements is/are correct?
Correct
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
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
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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?
Correct
Solution: c)
NCERT Class VII Science Chapter – 8
Incorrect
Solution: c)
NCERT Class VII Science Chapter – 8
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Question 12 of 17
12. Question
With reference to physical exercise and its effects, consider the following statements
- After heavy exercise the cramps occur when muscle cells respire aerobically
- The accumulation of lactic acid causes muscle cramps
- 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?
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
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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:
Correct
Solution: b)
NCERT Class VII Science Chapter – 12
Incorrect
Solution: b)
NCERT Class VII Science Chapter – 12
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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?
Correct
Solution: b)
NCERT Class VII Science Chapter – 16
Incorrect
Solution: b)
NCERT Class VII Science Chapter – 16
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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
Which of the above statements is/are correct?
Correct
Solution: d)
http://www.who.int/csr/disease/smallpox/en/
NCERT Class VIII Science Chapter – 2
Incorrect
Solution: d)
http://www.who.int/csr/disease/smallpox/en/
NCERT Class VIII Science Chapter – 2
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Question 16 of 17
16. Question
Chicken Pox is caused by
Correct
Solution: a)
NCERT Class VIII Science Chapter – 2
Incorrect
Solution: a)
NCERT Class VIII Science Chapter – 2
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Question 17 of 17
17. Question
With reference to natural gas consider the following statements:
- Natural gas is stored under high pressure as liquid petroleum gas (LPG)
- Natural gas is a renewable resource
- Natural gas is a hydrocarbon gas mixture consisting primarily of methane
Which of the above statements is/are correct?
Correct
Solution: c)
NCERT Class VIII Science Chapter – 5
Incorrect
Solution: c)
NCERT Class VIII Science Chapter – 5
