CBSE Questions for Class 7 Biology Respiration In Organisms Quiz 4 - MCQExams.com

All living organisms need to respire to get the energy needed for their survival.
  • True
  • False
The percentage of oxygen and carbondioxide in inhaled air is?
  • 21% and 0.04%
  • 16.4% and 4.4%
  • 2% and 4%
  • 6% and 4%
Which of the following is incorrect about gills?
  • Gills are projections of the skin in fishes.
  • Gills are well supplied with blood vessels for exchange of gases.
  • Gills in fish help them to use oxygen dissolved in water.
  • Gills in fish help them to use carbondioxide dissolved in water.
In roots, which are underground, take in oxygen from __________. 
  • Soil
  • Bacteria
  • Root hairs
  • Air
Each cell of an organism performs certain functions such as nutrition, transport, excretion and reproduction.
  • True
  • False
Anaerobic respiration__________.
  • doesn't require CO2
  • doesn't require oxygen
  • requires oxygen
  • requires CO2
In which of the following cellular respiration takes place?
  • Plants
  • Animals
  • Unicellular organisms
  • All of the above
Human breathe out air which is rich in ______.
  • carbon dioxide
  • oxygen
  • Both A and B
  • None of the above
State whether the given statement is True or False.
Plant can die if overwatered.
  • True
  • False
In earthworm, the exchange of gases occurs through the moist skin. In fishes it takes place through gills and in insects through the tracheae.
  • True
  • False
Increased physical activity doesn't enhances the rate of breathing.
  • True
  • False
The breakdown of _______ in the plant cells is similar to that in other living beings.
  • Glucose
  • Water
  • Light
  • All of the above
In respiration:
  • Chlorophyll synthesises food From carbon dioxide and water in the presence of sunlight.
  • Oxygen absorbed from air or Water is made to combine with carbon dioxide to produce food.
  • Chlorophyll absorbs oxygen from air or water and releases carbon dioxide.
  • 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?
  • ATP
  • Alcohol
  • Lactic acid
  • Carbon dioxide
Lime water turns milky when the exhaled air is expelled in the test tube because of the presence of 
  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • None of the above
Which of the following activities is characterised by minimum breathing rate?
  • Sleeping
  • Washing of clothes
  • Cleaning of floor
  • Dancing
The gas-exchange surfaces of aquatic animals are
  • Tracheae
  • Spiracles
  • Gills
  • Lungs
Which of the following situation is likely to cause muscle cramps?
  •  Glucose $$\xrightarrow{Absence\, of\, Oxygen}\ $$ Lactic acid
  •  Glucose $$ \xrightarrow{Oxygen}\, $$ Lactic acid
  • Glucose $$\xrightarrow{Absence\, of\, Oxygen}\ $$ Alcohol + CO$$_2$$
  • Glucose $$\xrightarrow{Oxygen}\, $$ CO$$_2$$ + H$$_2$$O
Insects have respiratory tubules also known as _______.
  • Arteries 
  • Spiracles 
  • Trachea 
  • 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?
  • Incomplete oxidation of glucose takes place
  • all the amount of energy can be utilized by the cell as more ATP molecules are produced
  • maximum amount of this released energy is wasted in form of heat and cell may die
  • cell will follow anaerobic pathway of respiration
Breathing rate ........... during physical exercise.
  • Increases
  • Decreases
  • Remains same
  • Decreases then increases
Which of the following is considered to be a breath
  • 2 inhalation + 2 exhalation
  • 1 inhalation + 2 exhalation
  • 2 inhalation + 1 exhalation
  • 1 inhalation + 1 exhalation
Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise?
  • Glycogen
  • Pyruvic acid
  • Glucose
  • Lactic acid
Spiracle is the respiratory organ of:
  • Cockroach
  • Birds
  • Earthworm
  • Plants
In a cockroach, the air enters the body through ________.
  • Lungs
  • Gills
  • Skin
  • Spiracles
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