Chapter 13 (Gaseous Exchange) F.Sc 1st Year Biology Short Questions

What is diving reflex in cetaceans?

Aquatic mammals, especially cetaceans (whales, dolphins) can stay in the depth of the ocean for about two hours without coming up for air. Diving mammals have almost twice the volume of blood in relation to their body weight as compared to non-divers. Most of the diving mammals have high concentration of myoglobin in their muscles. Myoglobin binds extra oxygen.[the_ad id=”17141″]

Differentiate between respiration and breathing.

Breathing is the physical process where you inhale and exhale air in and out of your lungs. Respiration is a chemical reaction where Oxygen is used to breakdown Glucose in order to generate energy which is then used by the cell to function.

Write gaseous exchange in plants.

Plants also get their energy from respiration. No special organ or system is present for gaseous exchange in plants. Every cell of every part of plant carries out exchange of gases according to its needs through stomata.

What is rubisco? Give its function.

Rubisco (Ribulose biphosphate carboxylase/oxygenase) is an enzyme which during photorespiration fixes oxygen instead of carbon dioxide in Calvin cycle and results in lowering the overall rate of carbon dioxide fixation and plant growth.

What products are produced during photorespiration?

Glycolate, glycine and serine are produced during photorespiration.

Leave a Comment