B6 Plant Structures and their Functions

Question 1

How do plants make their own food?

Answer 1

Photosynthesis

Question 2

What is the word equation for the photosynthesis?

Answer 2

Carbon dioxide + water —> glucose + oxygen

Question 3

What are the three limiting factors of photosynthesis?

Answer 3

1. Light intensity
2. Carbon dioxide concentration
3. Temperature

Question 4

How do plants transport food substances?

Answer 4

In phloem tubes

Question 5

How do plants transport water?

Answer 5

In xylem tubes

Question 6

How are phloem tubes specialised?

Answer 6

They are elongated living cells with small pores in the end walls to allow stuff to flow through

Question 7

How are xylem tubes specialised?

Answer 7

They are made of dead cells joined end to end with no cell walls between them. They are strengthened by a material called lignin

Question 8

What is transpiration?

Answer 8

Transpiration is the evaporation and diffusion of water from a plant’s surface

Question 9

How are some plants adapted to live in extreme environments?

Answer 9

1. Small leaves to reduce transpiration
2. Thick waxy cuticles to reduce transpiration
3. Spines to deter animals
4. Strong roots to stay rooted into the ground

Question 10

What are some commercial uses of plant hormones?

Answer 10

1. Auxins used in weedkillers
2. Ethene used to ripen fruits
3. Gibberellins to produce seedless fruit and make plants flower earlier