Q. An animal that can tolerate the heat of the desert is -
1) Rats
2) Camel
3) Cow
4) Lion
Q. If waste materials contaminate the source of drinking water which of the following diseases will spread ?
1) Scurvy
2) Typhoid
3) Malaria
4) Anaemia
Q. Which of the following wastes cannot be decomposed by bacteria to form compost ?
1) Kitchen wastes
2) Plastic and polythene bags
3) dead plants
4) bodies of insects living in the soil
Q. Which of the following problems is not created by noise pollution ?
1) Diarrhoea
2) Hypertension
3) Deafness
4) Irritation
Q. Consider the following statements :
1. The common blue green algae, Spirogyra and Ulothrix, are found in both fresh water ponds and oceans.
2. The chameleon can look ahead with one eye, and at the same time look behind with another.
Which of these statements is are correct?
1) Only 1
2) Only 2
3) Both 1 and 2
4) Neither 1 nor 2
Q. The age of tree, in years, can be ascertained by -
1) its weight
2) its height
3) the number of its annular rings
4) length of its root
Q. Which component of plants receives stimulus for flowering ?
1) Stems
2) Branches
3) Leaves
4) Roots
Q. The release of which one of the following into ponds and wells helps in controlling the mosquitoes ?
1) Crab
2) Dogfish
3) Gambusia fish
4) Snail
Q. The complete conversion of glucose, in the presence of oxygen, into carbon dioxide and water with release of energy is called :
1) aerobic respiration
2) anaerobic respiration
3) glycolysis
4) hydrolysis
Q. 'Kuttu' flour is obtained from -
1) Tapioca
2) Fagopyrum
3) Plantago
4) Eleusine
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