1.Name the reducing agent in the given equation:
Fe₂O₃ + 3CO → 2Fe +3CO₂
Ans: Carbon monoxide(3CO) is the reducing agent.
2. Name the extensively coiled structure of alimentary canal.
Ans: The extensively coiled structure in alimentary canal is ileum of the small intestine.
3. Name the acid present in-Tomato and Vinegar
Ans: The acid present in tomato is oxalic acid.
The acid present in vinegar is acetic acid.
4. Name the receptors that are located in tongue and nose?
Ans: Olfactory receptors are present in nose they detect the smell.
Gustatory receptors are present in tongue they detect taste.
5. Name the material transported by pulmonary artery and pulmonary vein?
Ans: Pulmonary artery : Transport deoxygenated blood from heart to lungs.
Pulmonary veins : Transport oxygenated blood from lungs to heart.
6. Which is the internal energy reserve in plants? Do animals have the same energy reserve?
Ans: Starch is the internal energy reserve in plants. No, animals do not have the same energy reserve. The energy reserve in animals is glycogen.
7. Why do we prefer a convex as a rear view mirror in vehicles?
Ans: Convex mirror always produces virtual, erect and diminished image of the objects.
8. A person is advised to wear spectacles with convex lenses. State the defect he is suffering from?
Ans: Hypermetropia
9. What is the range of vision of a normal human eye?
Ans: near by range - 25 cm and far by range-away 25cm and infinity..
10. What happens-?
a. When bleaching powder is kept open in air.
b. Chlorine gas is passed through dry slaked lime.
Ans: A) Bleaching powder is yellowish white powder with a strong smell of chlorine. This is because bleaching powder reacts with carbondioxide from the atmosphere to produce calcium carbonate and chlorine.
CaOCl 2 +CO 2 ⟶CaCO3 +Cl2 ↑
B) When chlorine is passed through slaked lime bleaching powder is formed.
Ca(OH)2 +Cl2 ⟶CaOCl2 +H2 O
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