What is movement of cell against concentration gradient is

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A. What is movement of cell against concentration gradient is called
1) osmosis
2) active transport
3) diffusion
4) passive transport

B. Plants receive their nutrients mainly from ?
1)atmosphere
2)chlorophyll
3)light
4)soil

C. What is Pollination ?
1)germination of pollen grains
2)growth of pollen tube in ovule
3)transfer of pollen from anther to stigma
4)visiting flowers by insects

D. Which one of the following air pollution can affect blood stream leading to death ?
1)Cadmium
2)Asbestos dust
3)Carbon monodioxide
4)Lead

E. Which one of the following disease is not transmitted by tiger mosquitoes ?
1)Dengue
2)Chikungunya
3)Japanese Encephalitis
4)Yellow fever

F. Which of has following group of gases contribute to the 'Green House Effect' ?
1)Carbon tetrafluoride and Nitrous oxide
2)Carbon monoxide and Sulphur dioxide
3)Ammonia and Ozone
4)Carbon dioxide and Methane

G. Among the biotic components of the ecosystem, the producer system is ?
1)Sea
2)Rivers
3)Green Plants
4)Animals

H. Placenta is the structure formed :
1)by fusion of germ layers
2)by foetus only
3)by the union of foetal and uterine tissue
4)by uterine only

Reference no: EM131669621

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