4th

Question 1

What will more red blood cells improve in athletes?

Answer 1

It means the athlete will have more red blood cells in their blood which means they can carry more oxygen, improving endurance performance.

Question 2

What could happen if someone has a low number of white blood cells?

Answer 2

White blood cells fights infection and having a low number can make people vulnerable to catching diseases.

Question 3

What cells are bigger?

Answer 3

White blood cells.

Question 4

What colour do white blood cells appear under the microscope?

Answer 4

Purple

Question 5

Can you see platelets under a microscope? Why? What number of red blood cells do you have compared to white?

Answer 5

• no too small to be seen

- lots compared to white.

Question 6

What do plants transport?

Answer 6

Water, minerals, sugars.

Question 7

What do xylem tubes do?

Answer 7

• carry water and mineral salts

- roots to leaves

Question 8

Why does water move in a continuous column?

Answer 8

It helps to support plants.

Question 9

What process do plants use water for and why?

Answer 9

• photosynthesis

- stops plants wilting

Question 10

How do plants keep cool and what is this called?

Answer 10

• water evaporating form leaves

- transpiration

Question 11

What happens when water is lost in transpiration?

Answer 11

• water pulled up stem replace water
• used by plant, lost in transpiration
• works like sucking on straw

Question 12

As water evaporates, what else is lost?

Answer 12

Mass

Question 13

What do you need to know to be able to compare the mass with other plants and what can affect the rate of loss of mass?

Answer 13

• need to know volume of water added
• light intensity
• temperature

Question 14

How can you ensure all the mass lost is from the plant and not from the pot/soil?

Answer 14

• wrap in bag

- or plastic wrap

Question 15

How would you show xylem vessels on celery?

Answer 15

• coloured water hour
• diagram
• xylem red