1.The process that leads to the formation of impulses in photoreceptors is :
(a) The dissociation of visual pigments in the presence of light
(b) Formation of Vitamin A in the presence of light
(c) The transmission of impulses to cerebrum through the optic nerve
(d) The reunion of retinal and opsin
Answer
(a) The dissociation of visual pigments in the presence of light
2. What are indicated by (i) and (ii) in the illustration of DNA molecule given below ?
Answer
i) G (Guanine)
ii) P (Phosphate)
3. Analyse the given symptoms and identify the disease.
Low metabolic rate
Hypertension
Inflammation in tissues
Answer
Myxoedema
4. Based on the given model, make a suitable pair from the following box :
Model
Charles Darwin - The theory of natural selection.
Answer
Hugo deVries, Mutation theory
5. In plants, which is the chemical substance that prevents the germs, that have crossed the cell wall from entering the cell membrane ?
Answer
Callose
(a) The dissociation of visual pigments in the presence of light
(b) Formation of Vitamin A in the presence of light
(c) The transmission of impulses to cerebrum through the optic nerve
(d) The reunion of retinal and opsin
Answer
(a) The dissociation of visual pigments in the presence of light
2. What are indicated by (i) and (ii) in the illustration of DNA molecule given below ?
i) G (Guanine)
ii) P (Phosphate)
3. Analyse the given symptoms and identify the disease.
Low metabolic rate
Hypertension
Inflammation in tissues
Answer
Myxoedema
4. Based on the given model, make a suitable pair from the following box :
Model
Charles Darwin - The theory of natural selection.
| Hugo deVries, Lamarck, Chemical evolution theory, Panspermia, Mutation theory, Robert Malthus |
Hugo deVries, Mutation theory
5. In plants, which is the chemical substance that prevents the germs, that have crossed the cell wall from entering the cell membrane ?
Answer
Callose
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