Summative Practice Chapter 6 – Question 1, 2, 3 & 4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
Name the sequences in the mitosis process.

Prophase, metaphase, anaphase, telophase

Question 2:
What is the function of the centriole in the division of animal cells?

To form spindle fibres

Question 3:
State one difference between mitosis metaphase and meiosis metaphase I.

• At the mitotic metaphase stage, chromosomes are arranged on the equatorial plane whereas in metaphase I, homologous chromosomes are arranged at equatorial plane.

• At the mitotic metaphase stage, each chromatid is tied to spindle fibres at the centromere whereas at the metaphase I stage, one chromosome from each pair of homologous chromosomes is tied to the spindle fibres from one pole and the other is tied to the spindle fibres from the opposite pole.

Question 4:
(a) Explain the importance of cell division that happens at the tip of a plant root.

(b) A farmer wants to plant a large number of quality breed mango trees in a short time for commercial purposes. State and explain the techniques that can be used by the farmer.

Cells divide actively through mitosis to produce more cells. The high number of cells elongates the roots so that it can absorb more water and mineral salts to support plant growth.

• Technique: tissue culture

• Explants are placed in a sterile culture medium that contains nutrients and growth hormones.

• Explants divide mitotically to form callus. This callus then forms embryo/plantlets.

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