Plant cell ultrastructure

Question 1

Cellulose cell wall

Answer 1

Freely permeable so substances can pass in and out of the cell

Provide shape and rigidity of the cell

Also acts as a defense mechanism protecting against pathogens

Question 2

permanent vacuoles

Answer 2

membrane lined sacs containing cell sap

Importance in the maintenance of turgor

The membrane of a vacuole is called a tonoplast

It is selectively permeable

Question 3

chloroplasts

Answer 3

Responsible for photosynthesis

Double membrane structure

Fluid called stroma

Internal membrane network that flatterns and form thylakoids, these stack together to form granum

The grana are joined by membranes called lamellae

Grana contain the chlorophyll pigments

Contain DNA and ribosomes

Question 4

starch grains

Answer 4

storage of starch produced by photosynthesis