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CBSE Questions for Class 7 Biology Respiration In Organisms Quiz 4 - MCQExams.com
CBSE
Class 7 Biology
Respiration In Organisms
Quiz 4
All living organisms need to respire to get the energy needed for their survival.
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0%
True
0%
False
Explanation
All living organisms respire. Cells need and use the energy that is formed through this process to assist with life processes in order for organisms to survive and reproduce.
Hence, the statement is true.
The percentage of oxygen and carbon
dioxide in inhaled air is?
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0%
21% and 0.04%
0%
16.4% and 4.4%
0%
2% and 4%
0%
6% and 4%
Explanation
The percentage of oxygen and carbon dioxide during inhalation is 21% and 0.04% respectively. Option A is correct.
Which of the following is incorrect about gills?
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0%
Gills are projections of the skin in fishes.
0%
Gills are well supplied with blood vessels for exchange of gases.
0%
Gills in fish help them to use oxygen dissolved in water.
0%
Gills in fish help them to use carbondioxide dissolved in water.
Explanation
Gills in fish help them to use oxygen dissolved in water. Therefore, Option D is incorrect among the options given about Gills.
In roots, which are underground, take in oxygen from __________.
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0%
Soil
0%
Bacteria
0%
Root hairs
0%
Air
Explanation
Roots take up oxygen from the air spaces present between the soil particles. Option A is correct.
Each cell of an organism performs certain functions such as nutrition, transport, excretion and reproduction.
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0%
True
0%
False
Explanation
Each cell of an organism performs certain functions such as nutrition, transport, excretion and reproduction. A cell is the smallest structural and functional unit of an organism. Statement is true.
Anaerobic respiration__________.
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0%
doesn't require CO2
0%
doesn't require oxygen
0%
requires oxygen
0%
requires CO2
Explanation
Organisms convert energy for their use in the absence of oxygen are called anaerobes. And this type of respiration which doesn't require oxygen is called Anaerobic respiration. Option B is correct.
In which of the following cellular respiration takes place?
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0%
Plants
0%
Animals
0%
Unicellular organisms
0%
All of the above
Explanation
Cellular respiration takes place in the cells of all organisms. Thus, Option D is correct.
Human breathe out air which is rich in ______.
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0%
carbon dioxide
0%
oxygen
0%
Both A and B
0%
None of the above
Explanation
Human beings breathe out
air which is rich in
carbon dioxide
. Option A is correct.
State whether the given statement is True or False.
Plant can die if overwatered.
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0%
True
0%
False
Explanation
Roots growing in waterlogged soil may
die
because they cannot absorb the oxygen needed to function normally. The longer the air is cut off, the greater the root damage. The
dying
roots decay and cannot supply the
plants
with nutrients and water. Damage caused by
over watering
is frequently misdiagnosed as pest damage.
Hence, the statement is True.
In earthworm, the exchange of gases occurs through the moist skin. In fishes it takes place through gills and in insects through the tracheae.
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0%
True
0%
False
Explanation
In earthworm, the exchange of gases occurs through the moist skin.
In fishes respiration takes place through gills
In insects respiration takes place through the tracheae.
Hence, the statement is true.
Increased physical activity doesn't enhances the rate of breathing.
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0%
True
0%
False
Explanation
During exercise and muscles work harder, the body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, breathing has to increase about 50-40 times a minute.
Hence, the statement is False.
The breakdown of _______ in the plant cells is similar to that in other living beings.
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0%
Glucose
0%
Water
0%
Light
0%
All of the above
Explanation
The breakdown of Glucose in the plant cells is similar to that in other living beings. Option A is correct.
In respiration:
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0%
Chlorophyll synthesises food From carbon dioxide and water in the presence of sunlight.
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Oxygen absorbed from air or Water is made to combine with carbon dioxide to produce food.
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Chlorophyll absorbs oxygen from air or water and releases carbon dioxide.
0%
Oxygen is absorbed from air or water and made to combine with food and carbon dioxide is released.
Explanation
Correct option - D
The explanation for correct option -
Respiration is the inhalation of oxygen and exhalation of carbon dioxide. It is the process by which cells use oxygen to break down sugar and in return get energy.
Thus physiologic respiration is required to sustain cellular respiration ( both are different ). Thus we say that in respiration oxygen is absorbed from air or water and made to combine with food and carbon dioxide is released.
Usain Bolt, an Olympic runner, at the end end of a 100 meter sprint, will have more of which of the following in his muscles?
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0%
ATP
0%
Alcohol
0%
Lactic acid
0%
Carbon dioxide
Explanation
Correct Option C
Solution
∙
Usain Bolt is an olympic runner, and the muscles of runner are always under a continuous activity while they are running in the Olympics.
To run fast he needs all the energy and his muscles need to respire quickly.
∙
In order to meet this demand the muscles undergo anaerobic respiration in which the glucose particles breaks down without the requirement of oxygen and energy is released.
∙
During this process lactic acid is produced instead of carbon dioxide and water. This lactic acid can cause cramps and muscle strain.
∙
So the correct option is C.
Lime water turns milky when the exhaled air is expelled in the test tube because of the presence of
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0%
Carbon dioxide
0%
Oxygen
0%
Nitrogen
0%
None of the above
Explanation
When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.
Exhaled air contains less oxygen and more carbon dioxide.
The carbon dioxide present in exhaled air turns lime water milky.
So the correct answer is 'Carbon dioxide'.
Which of the following activities is characterised by minimum breathing rate?
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0%
Sleeping
0%
Washing of clothes
0%
Cleaning of floor
0%
Dancing
Explanation
During sleeping, the body has the least activities to carry out, hence it does not require a high amount of oxygen. So it has minimum metabolism and hence minimum breathing rate.
So the correct answer is 'Sleeping'.
The gas-exchange surfaces of aquatic animals are
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0%
Tracheae
0%
Spiracles
0%
Gills
0%
Lungs
Explanation
Correct Option C
Solution
∙
Option A
Trachea is a a cartilaginous tube which connects the larynx to the bronchioles of the lungs tube and functions as the pathway for the oxygen to enter into human body. Its primary function is to carry the oxygen in and out of the lungs.
∙
Option B
Spiracles are the the small openings in the respiratory tube. These are generally found in arthropods. Insects and other organisms breathe through these openings and exchange gases which are present in the thorax and the abdomen.
∙
Option C
Gills are the gaseous exchange surface of aquatic animals. These are the branching organs which are located in the animals and have many blood vessels in them called capillaries which pics of the oxygen that's dissolved in the water and provides it to the organism.
∙
Option D
Lungs are are the air filled organs which are located in the thorax cavity. There are millions of small air sacs present called really which help in the gaseous exchange in lungs. All vertebrate animals have lungs that live on land.
So, the correct option is C.
Which of the following situation is likely to cause muscle cramps?
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0%
Glucose
A
b
s
e
n
c
e
o
f
O
x
y
g
e
n
→
Lactic acid
0%
Glucose
O
x
y
g
e
n
→
Lactic acid
0%
Glucose
A
b
s
e
n
c
e
o
f
O
x
y
g
e
n
→
Alcohol + CO
2
0%
Glucose
O
x
y
g
e
n
→
CO
2
+ H
2
O
Explanation
During exercise, the breathing rate increases to get more oxygen into the body which is transferred to the blood in the lungs. Heart rate increases to pump more blood around the body but, during hard exercise, the body is unable to supply sufficient oxygen to the muscle cells. This results in anaerobic respiration.
During
anaerobic respiration (absence of oxygen) incomplete breakdown of glucose occur resulting in the formation of lactic acid.
The buildup of lactic acid in muscles causes fatigue and results in cramps.
Thus, the correct answer is option A.
Insects have respiratory tubules also known as _______.
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0%
Arteries
0%
Spiracles
0%
Trachea
0%
Veins
During aerobic respiration, energy is released in stepwise manner and ATP formation takes place with the help of this energy. What will happen if this energy is released at a single step instead of in parts?
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0%
Incomplete oxidation of glucose takes place
0%
all the amount of energy can be utilized by the cell as more ATP molecules are produced
0%
maximum amount of this released energy is wasted in form of heat and cell may die
0%
cell will follow anaerobic pathway of respiration
Breathing rate ........... during physical exercise.
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0%
Increases
0%
Decreases
0%
Remains same
0%
Decreases then increases
Explanation
Breathing rate is defined as the no. of times a person breathes in one minute. It increases during physical exercise to fulfill the increased demand for oxygen in the body caused by the increase in the metabolic rate.
So, the correct answer is option A.
Which of the following is considered to be a breath
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0%
2 inhalation + 2 exhalation
0%
1 inhalation + 2 exhalation
0%
2 inhalation + 1 exhalation
0%
1 inhalation + 1 exhalation
Explanation
The number of times a person breath is called breathing rate. A breath consists of one exhalation and one inhalation. Inhalation involves breathing in the air while exhalation involves the breathing out the air.
So the correct answer is '1 inhalation + 1 exhalation'.
Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise?
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0%
Glycogen
0%
Pyruvic acid
0%
Glucose
0%
Lactic acid
Spiracle is the respiratory organ of:
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0%
Cockroach
0%
Birds
0%
Earthworm
0%
Plants
Explanation
A spiracle is a respiratory organ in insects such as cockroaches. It is an external opening present on the sides of the abdomen of the body. They are connected with tracheal tubes for gas exchange. Oxygen-rich air rushes through spiracles
into the tracheal tubes, diffuses into the
body tissue, and reaches every cell of
the body. Similarly, carbon dioxide from
the cells goes into the tracheal tubes and
moves out through spiracles.
So, the correct answer is option A.
In a cockroach, the air enters the body through ________.
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0%
Lungs
0%
Gills
0%
Skin
0%
Spiracles
Explanation
In cockroaches, the respiratory system has a network of the trachea. They open through 10 pairs of spiracles that are present on the side of the abdomen. The air enters the body through these spiracles.
So the correct answer is option D.
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