Q. The Percentage of Nitrogen gase in the atmosphere is -
Q. What is the source of energy in Ecosystem?
1) Solar radiation
2) Cosmic radiation
3) Geothermal energy
4) All of these
Q. Which one of the following is a large blood vessel that carries blood away from the heart to the lungs?
Q. Which one of the following is estimated by the radio carbon dating?
1) Age of the human being
2) Age of the fossils
3) Disease of the human body
4) Purity of the metals
Q. Which one of the following cell organelles does not possess nucleic acid?
4) Plasma Membrane
Q. Which one of the following cell organelles does not possess its own genetic material encoding proteins?
Q. Which one of the following is not a component of conducting tissue in plants?
4) Sieve tubes
Q. Which one of the following organisms represents the primary consumer category in an ecosystem?
2) Crabapple tree
Q. Which one of the following organisms has vascular tissues?
Q. Tooth enamel is made up of which one of the following calcium compounds?
1) Calcium carbonate
2) Calcium sulphate
3) Calcium hydroxide
4) Calcium phosphate
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