Water and inorganic ions

Question 1

Properties of water (1)

Answer 1

water is a liquid at room temperature and dissolves more substances than any other common liquid

act a a solvent
act as a medium for transport
act as a medium for chemical reactions
act as a major cell constituent

Question 2

properties of water (2)

Answer 2

much heat energy is needed to change the temperature of water
-
aquatic environment (ocean and river) have stable temperatures

organisms have stable temperatures

Question 3

properties of water (3)

Answer 3

act as a cooling agent

Question 4

properties of water (4)

Answer 4

ice floats on the surface of water, insulating the water below and preventing the entire water body from becoming ice

aquatic life can still survive beneath the ice layer on the surface

Question 5

properties of water (5)

Answer 5

act as a supporting agent
(support in young plants by turgidity of cells

Question 6

Nitrogen

Answer 6

Nitrate ion / ammonium ion
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making amino acids / protein
making nucleotides / nucleic acids
making chlorophyll

Question 7

magnesium

Answer 7

making chlorophyll

Question 8

iron

Answer 8

making haemoglobin

Question 9

calcium

Answer 9

calcium ion
-
controlling muscle contraction
controlling blood clotting
making bones and teeth

Question 10

phosphorus

Answer 10

making bones and teeth
making cell membrane