Leaf Labels And Functions

Question 1

What is the function of the upper epidermis

Answer 1

Is protects the plant whilst letting the sun shine in as it is thin and transparent

Question 2

What is the palisade mesophyll

Answer 2

A layer of palisade cells which absorb light. They are near the surface so light can get to them easily and palisade cells are filled with chloroplasts

Question 3

What is the xylem

Answer 3

It is made from dead cells and lignin. It moves water through the plant from the roots to the leaves via the stem.

Question 4

What is the phloem

Answer 4

It is made from living cells and moves dissolved sugars from photosynthesis and other soluble food molecules from the leaves to growing and storing tissues

Question 5

What is the spongy mesophyll

Answer 5

It is filled with air spaces to allow CO2 to diffuse from the stomata to the photosynthesising cells. It provides a large internal sa:v

Question 6

What is the lower epidermis

Answer 6

The lower epidermis is at the bottom of the leaf. It contains guard cells that open and close the stomata where gas exchange happens, water vapour is also lost through the stomata during transpiration

Question 7

What is the cuticle

Answer 7

A thin waxy protective layer on top of the leaf. It reduces water loss by evaporation and prevents entry of pathogens