Formative Practice 2.1 (Form 5 Biology Textbook Exercise and Answer)


Question 1:
Name two external structures of a leaf.

Answer:
Lamina and petiole


Question 2:
What is the importance of cuticle in leaves?

Answer:
To prevent excessive loss of water through evaporation.


Question 3:
Name five internal structures of a leaf.

Answer:
Upper epidermis, palisade mesophyll, spongy mesophyll, vascular bundle and lower epidermis.


Question 4:
State the functions of xylem and phloem.

Answer:
Xylem – to transport water and mineral salts absorbed from the roots to the leaves.

Phloem – to transport organic substances produced during photosynthesis from the leaves to other parts of the plants.


Question 5:
The layer of cuticle and upper epidermis is transparent. Justify.

Answer:
To allow sunlight to pass through it for photosynthesis.


Question 6:
Compare the layers of palisade mesophyll and spongy mesophyll.

Answer:
Palisade mesophyll – Contains many and chloroplasts and closely arranged.
Spongy mesophyll – Contains less number of chloroplast and loosely arranged.

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