Page 90 - Biology Form Two

Biology for Secondary Schools

Exercise 4.1 Absorption and movement of water
and mineral salts
1. The diagram below represents a
transverse section of a (i) young Task 4.2
stem and (ii) young root. Use internet sources to search for
FOR ONLINE READING ONLY
(i) a simulation or video showing the

absorption and movement of water and
mineral salts in plants.

Plants absorb water and mineral salts

C from the soil through root hairs. The
root hairs are found just behind the
B
root tip. They are in contact with the

A soil and soil water.
(ii)
Activity 4.2: Investigate the absorption
of water by plant roots

Materials

C A plant with variegated leaves or light
A coloured flowers, coloured water, and
a beaker

Procedure

1. Uproot the plant gently, taking care
(a) Explain the functions of the not to break or damage the roots.
parts labeled A, B and C.
2. Dip the plant in a beaker containing
(b) Describe three differences coloured water. Ensure that the
between the sections shown plant roots are immersed in the
above. water.

2. Describe how xylem vessels are 3. Leave the set up overnight.
adapted to their functions. 4. Observe the variegated leaves or

3. Explain the meaning and the petals of the plant.
importance of translocation. Questions

1. What have you observed?

2. What can you conclude?

84 Student’s Book - Form Two

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BIOLOGY FORM 2 NEW.indd 84