2.5 The ultrastructure of plant cells

Question 1

Cell wall

Answer 1

Support and structure.​
Made of cellulose (polysaccharide cellulose).​

Plasmodesmata → Pores within wall allows substances to move from one to another.​

Connect two cells together by their cytoplasm, enabling the exchange and transport of substances.

Question 2

Vacuole

Answer 2

Regulate osmosis and keep cell turgid.​

A vacuole consists of a membrane called the tonoplast.​

Filled with cell sap (a watery solution of different substances including sugars, enzymes and pigments.

Question 3

Chloroplast

Answer 3

Function: site of photosynthesis.​
Use carbon dioxide, water and light energy to build sugars.​

The chloroplast is surrounded by a double membrane.​
It is filled with a liquid called the stroma, and contains stacks of thylakoid membranes called grana.​
The thylakoid membranes are the site of photosynthesis

Question 4

end of 2.5