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


Question 1:
Do all plants need a transport system?
Explain.

Answer:
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.

Answer:
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?

Answer:
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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