1). Plants are killed in winter by frost
A). because of desiccation and mechanical damage to the tissues |
B). because no photosynthesis takes place at such low temperature |
C). because respiration ceases at such low temperature |
D). because there is no transpiration |
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2). Number of chromosomes in Down's syndrome is
A). 46 |
B). 47 |
C). 48 |
D). 49 |
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3). Rain water helps to increase the ____ to some extent.
A). phosphorous contents |
B). nitrogen contents |
C). calcium contents |
D). potash contents |
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4). Mumps is a disease caused by
A). fungus |
B). bacterium |
C). virus |
D). None of these |
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5). Most abundant tissues of our body are
A). muscular |
B). Skeletal Muscle |
C). epithelial |
D). nervous |
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6). Most common disease of poultry in India is
A). fowl pox |
B). tick fever |
C). ranikhet |
D). coryza |
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7). Ptyalin is an enzyme produced in the
A). salivary glands |
B). pituitary glands |
C). thyroid glands |
D). pancreas |
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8). Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
A). By cyanobacteria |
B). By electrical discharges in the atmosphere |
C). By industrially synthesised fertilizer |
D). By denitrification |
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9). Pollen grains in plants are produced in
A). roots |
B). leaves |
C). flower |
D). stem |
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10). Pollination by wind is called
A). anemophily |
B). hydrophily |
C). zoophily |
D). entomophily |
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