Formative Practice 4.1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
Do all plants need a transport system?

No. Small plants like moss and algae have large surface areas to absorb water directly from its surroundings.

Question 2:
A tree is attacked by a type of bacteria which damages its xylem vessels. Predict the effects to the tree.

The plant will die as the xylem cannot transport water. This causes the plants to not be able to carry out photosynthesis.

Question 3:
Transport of organic compounds such as sucrose by active transport along the sieve tubes needs a lot of energy. How does this process happen even though the sieve tubes have very few mitochondria?

Sieve tubes have companion cells that are rich in mitochondria. The mitochondria in companion cells will generate energy (ATP) to be used by sieve tubes.

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