CAIE A-Level Biology AS 2.4 Water Topic Practice

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Question 1

[Maximum number: 4]

Question (a)

(a)

Fig. 3.2 shows two water molecules linked by a hydrogen bond.

Fig. 3.2

Fig. 3.2

Explain how hydrogen bonding occurs between water molecules.

[ 2 ]

Question (b)

(b)

Suggest why water is an excellent solvent for ions.

[ 2 ]

Question 2

[Maximum number: 4]

Question (a)

(a)

Hydrogen bonding is important in the movement of water in xylem.

[ 4 ]

Question (i)

(i)

Explain how hydrogen bonding occurs between two water molecules.

[ 2 ]

Question (ii)

(ii)

Hydrogen bonding between water molecules gives water a relatively high latent heat of vaporisation.

Suggest why it is important to plants that water has a high latent heat of vaporisation.

[ 2 ]
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