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Respiration in organism

NCERT 7th Class (CBSE) Science: Respiration in Organism

Question: What do you mean by ‘stomata’ apparatus?

Answer: Stomata apparatus means stomata along with nearby guard cells and other cells.

Question: What are the main organs of the respiratory system?

Answer: Main organs that help in respiration are :

  1. Nostrils (The passages in the nose)
  2. Trachea (Windpipe)
  3. Bronchi
  4. Lungs

Question: What chemical reaction occur during anaerobic respiration in yeast?

Answer: In yeast, the cellular glucose is converted into alcohol and carbon dioxide which give us energy.

Question: An athlete suffers from muscular cramps while running a race. How can you help him overcome the quips?

Answer: To relief from these cramps we should massage the affected part or take a hot bath.

Question: How does exchange of gasses occur in the following:


  1.  Fish: fish have special structure called girls. Dissolved oxygen is used from the water entering the gills. Gills are well supplied with blood for exchange of blood.
  2. Cockroach: Cockroaches movement of draws air in and out of the opening called spiracles. These openings are present on the body surface and are connected internally with a network of branched air tubes (trachea) and their branches (Tracheoles).

Question: How are combustion and cellular respiration similar to each other? In what ways are they different?

Answer: Similarities – During cellular respiration the sugar molecules in food are form carbon dioxide and water and energy is given out.

C6 H12 O6+ 602 → 6CO2 + 6H2O + energy

This is similar to the chemical reaction that occurs during burning or combustion.

Cellular Respiration
Combustion is a fast process.
Cellular Respiration is a slow process.
It occurs at high temperature.
It occurs at body temperature.
It can occur anywhere.
It occurs only in living cells.
Energy is released in a single step in the form of heat and light.
Energy is released in steps and stored in chemical molecules called ATP.

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