Gas Exchange in Plants

Question 1

Location and adaptations of epidermal

Answer 1

The epidermal surrounds the leaf. It’s a thick, strong layer to help protect the leaf

Question 2

Location and adaptations of palisade

Answer 2

It has many chloroplasts which are closely packed together in the upper part of the leaf which means more photosynthesis can happen.

Question 3

Location and adaptations of the spongy mesophyll

Answer 3

Located in the middle part of the leaf. It has fewer chloroplasts and air spaces to allow diffusion to happen

Question 4

Location and adaptations of the xylem

Answer 4

Located in the stem. It has no end walls so the xylem forms a continuous, hollow tube. It also contains a chemical called lignin which gives strength and support to the plant

Question 5

Location and adaptations of the phloem

Answer 5

Located in the stem
. Sieve tubes - specialized for transport and have no nuclei. Each sieve tube has a perforated end so its cytoplasm connects one cell to the next
. Companion cells - transport of substances in the phloem requires energy. One or more companion cells attached to each sieve tube provides this energy. A sieve tube is completely dependent on its companion cells.