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| 16)The digestive juice that lacks enzymes but helps digestion is | |||
| chyle | chyme | ||
| bile | none of these | ||
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| 17) The wavelength of light most effective in photosynthesis is | |||
| green | red | ||
| blue | yellow | ||
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| 18) The carbon of organic compounds in plants comes from | |||
| organic compounds absorbed from the soil | atmospheric carbondioxide | ||
| carbonates absorbed from soil | none of these | ||
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| 19)Green plants gives out oxygen during day time rather than carbon dioxide. This means | |||
| green plants do not respire | green plants respire only at night | ||
| rate of photosynthesis is higher than that of respiration | respiration rate of green plants is much lower during day time | ||
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| 20)Which of the following animals can bring oxygen directly to the cell? | |||
| spider | insects | ||
| scorpion | flatworm | ||
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| 21)One should not sleep under a tree at night because of | |||
| release of less oxygen | release of carbon monoxide | ||
| release of carbondioxide | release of more oxygen | ||
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| 22)The digestive and breathing passages cross in the | |||
| larynx | pharynx | ||
| trachea | none of these | ||
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| 23)In milk fat content is reduced during | |||
| summer | winter | ||
| monsoon | none of these | ||
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| 24)Consumption of Kesari dal is banned because it causes gradual loss of | |||
| movement of lower limbs | hearing | ||
| vision | white blood cells | ||
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| 25)The life span of human red corpuscles is | |||
| 180 days | 100 days | ||
| 120 days | equal to the life of the person | ||
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| 26)The average rate of heart beats in an adult is | |||
| 60 per minute | 72 per minute | ||
| 82 per minute | 86 per minute | ||
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| 27)The role of root hair in plants is | |||
| to bind the soil particles to the root for firm fixation of the plant | to protect the root from damage by coarse soil particles | ||
| to absorb water and minerals from the soil | none of these | ||
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| 28) The volume of a paste of rice or wheat increases if kept open for a night due to | |||
| bacterial growth | absorption of water by the particles of the paste | ||
| the release of carbon dioxide from the yeast activity | oxidation of the paste | ||
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| 29)The principle on which artificial kidney operates is | |||
| osmosis | active transport | ||
| diffusion | dialysis | ||
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| 30)The colour of human eyes is determine by the pigment present in the | |||
| choroid | cornea | ||
| iris | vitreous body | ||
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