Respiration and Photosynthesis - Leaf Structure and Transpiration

Question 1

what is a leaf

Answer 1

a leaf is an organ

Question 2

what types of tissue does the leaf contain

Answer 2

leaves contain both epidermal, mesophyll, xylem and phloem tissues

Question 3

why is the upper epidermis transparent

Answer 3

so that light can pass through it to the palisade layer

Question 4

why does the palisade layer have lots of chloroplasts

Answer 4

this is because its near the top of the leaf where they can get the most light

Question 5

what do the phloem tubes transport and what is this process called

Answer 5

phloem tubes transport food substances made in the leaves to the rest of the plant for immediate use. The transport goes in both directions and is called translocation

Question 6

what do xylem tubes transport

Answer 6

xylem tubes transport water and mineral ions from the roots to the stem leaves, this is called transpiration

Question 7

what are xylem tubes made up of

Answer 7

dead cells joined end to end with no end walls between them and a hole down the middle, strengthened with a material called lignin

Question 8

what are phloem tubes made up of

Answer 8

columns of elongates living cells with small pores in the end walls to allow cell sap to flow through

Question 9

what is transpiration

Answer 9

it is the loss of water from the plant

Question 10

what is transpiration caused by

Answer 10

the evaporation and diffusion of water from a plants surface