Question

2. What is respiration? Show how food is broken down into its constituents in the presence of
oxygen.
4. Which raw material is primarily responsible for the release of molecular oxygen in
photosynthesis?
5. Name some plants and animals that get their nutrition from other organisms without killing
them. What is the type of nutrition known as?
7. a) Name all the digestive enzymes present in our digestive system.
b) Explain the process of digestion of carbohydrates, fats and proteins.
8. a)Draw a sectional view of the human heart and label on it:
Arota, Pulmonary arteries, Vena cava, Left ventricle
b) Why is double circulation of blood necessary in human beings?
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Answer 1

Answer

It is a biological process in which

Inhaling of oxygen and exhaling carbon dioxide

Explanation:

Answer 2

•breathing

Hope it help