2.5 The Ultrastructure of Plant Cells

Question 1

What are plant cell walls made of?

Answer 1

Cellulose

Question 2

What makes the cell wall rigid in a plant cell?

Answer 2

The contents of the cell presses against the cell wall.

Question 3

Name 2 organelles that are unique to plant cells.

Answer 3

Vacuoles
Chloroplasts

Question 4

What is the membrane of a vacuole called?

Answer 4

The tonoplast.

Question 5

What do vacuoles contain and how permeable are they?

Answer 5

Cell sap, selectively permeable (some small molecules can pass through but other cannot).

Question 6

What is the fluid inside the double membrane of a chloroplast called? (1 mark)

Answer 6

Stroma

Question 7

Do chloroplasts have a single or double membrane? (1 mark)

Answer 7

Double

Question 8

What are the internal network membranes called in a chloroplast, and what is a stack of them called? (2 marks)

Answer 8

Thylakoids
Granum

Question 9

What are the granums inside the chloroplast joined together by? (1 mark)

Answer 9

Lamellae

Question 10

What do the granums in chloroplasts contain? (1 mark)

Answer 10

Chlorophyll pigments

Question 11

Where is the starch produced by photosynthesis stored in plant cells? (1 mark)

Answer 11

Inside the chloroplasts, as starch grains.

Question 12

What do mitochondria and chloroplasts both contain? (3 marks)

Answer 12

Double membrane
DNA
ribosomes