7th Grade > Biology
RESPIRATION IN ORGANISMS MCQs
Total Questions : 96
| Page 6 of 10 pages
Answer: Option A. ->
cramps
:
A
:
A
Lactic acid is a byproduct of anaerobic respiration of glucose. During heavy exercises or prolonged physical activity, there is a deficit of oxygen required to enable all the muscle cells to generate energy aerobically. Muscle cells then respire anaerobically and produces lactic acid. Accumulation of lactic acid in the muscles causes cramps.
Answer: Option C. ->
4.4%
:
C
:
C
The percentage of carbon dioxide in exhaled air is more than that of the percentage of carbon dioxide in the inhaled air. Inhaled air has about 0.04% of carbon dioxide. This is also the amount of carbon dioxide present in the atmosphere. The exhaled air contains all the carbon dioxide that is a by product of the cellular metabolic processes. Hence, the percentage of carbon dioxide in the exhaled air is 4.4%.
Answer: Option A. ->
Oxygen
:
A
Oxygen is required during the process of aerobic cellular respiration in the cell. Aerobic respiration is a process which utilises oxygen to breakdown glucose into carbon dioxide and water and release energy in the form of ATP.
It can be summarised as:
C6H12O6+6O2→6CO2+6H2O+38 ATP
:
A
Oxygen is required during the process of aerobic cellular respiration in the cell. Aerobic respiration is a process which utilises oxygen to breakdown glucose into carbon dioxide and water and release energy in the form of ATP.
It can be summarised as:
C6H12O6+6O2→6CO2+6H2O+38 ATP
Answer: Option C. ->
respiration
:
C
:
C
- Digestion breaks down the complex carbohydrates into simple glucose units. The glucose molecules are further broken down to release energy in respiration.
- During cellular respiration, glucose is further broken down into carbon dioxide and water with the help of oxygen and energy is released in the form of ATP. It can be summarised as:
C6H12O6+6O2→6CO2+6H2O+38 ATP
- Circulatory system performs the function of transport of various substances like water, hormones, oxygen, etc.
- Excretion refers to the elimination of waste products from the body.
Answer: Option B. ->
Lactic acid
:
B
:
B
Our muscles generally respire aerobically. During heavy exercises, the demand for energy in these cells are high but the supply of oxygen to produce energy is limited. In such situations, the muscle cells turn to anaerobic respiration to fulfil the energy demands. The anaerobic breakdown of glucose produces lactic acid in muscles.
Answer: Option B. ->
skin
:
B
∙ Amphibians like frogs breathe through their skin when they are submerged in water. This is called cutaneous respiration. In the land, they breathe through their lungs.
∙ Gills are present in fishes.
∙ Trachea is the site of gaseous exchange in insects.
∙ All mammals have lungs to breathe.
:
B
∙ Amphibians like frogs breathe through their skin when they are submerged in water. This is called cutaneous respiration. In the land, they breathe through their lungs.
∙ Gills are present in fishes.
∙ Trachea is the site of gaseous exchange in insects.
∙ All mammals have lungs to breathe.
Answer: Option B. ->
skin
:
:
Calcium hydroxide (chemical name for limewater) reacts with carbon dioxide in the exhaled air to form calcium carbonate which is insoluble in water and thus forms a milky white precipitate.
Answer: Option B. ->
skin
:
:
Presence of oxygen: 1 Mark
Absence of oxygen: 1 Mark
In the presence of oxygen, glucose breaks down into carbon dioxide and water with the release of energy.
In the absence of oxygen, glucose breaks down into alcohol and carbon dioxide with the release of energy.
Answer: Option B. ->
skin
:
Steps: 1 Mark each
The two steps of breathing are - inhalation and exhalation.
Inhalation is the action of intake of air into the lungs from the atmosphere.
Exhalation is the action of moving air from the lungs into the atmosphere.
:
Steps: 1 Mark each
The two steps of breathing are - inhalation and exhalation.
Inhalation is the action of intake of air into the lungs from the atmosphere.
Exhalation is the action of moving air from the lungs into the atmosphere.
Answer: Option B. ->
skin
:
:
Answers: 1 Mark each
(1) During emergency conditions (e.g. Lung failure) when lungs don't work properly, artificial respiration is required.
(2) The victim gets the oxygen through ventilators which act as artificial lungs.
(3) The person is kept on artificial respiration temporarily, until he regains his health and starts breathing naturally.
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