B7

Question 1

Circulatory system

Answer 1

System of blood vessels with a pump and valves to ensure one way flow of blood

Question 2

Red blood cell functions

Answer 2

transport oxygen around the body from the lungs to cells which require it for aerobic respiration
-They carry oxygen in the form of oxyhaemoglobin

Question 3

White blood cell functions

Answer 3

defend the body against infection by pathogens by carrying out phagocytosis and antibody production

Question 4

Plasma functions

Answer 4

transport of carbon dioxide, blood cells, soluble nutrients, urea, mineral ions, and hormones

Question 5

Platelets function

Answer 5

clotting

Question 6

Transpiration

Answer 6

loss of water vapour from plant leaves by evaporation of water at
the surfaces of the mesophyll cells followed by diffusion of water vapour through the stomata

Question 7

Xylem

Answer 7

carries water and dissolved salts/ions from the roots to the rest of the plant

Question 8

Phloem

Answer 8

transport food materials (mainly sucrose and amino acids) made by the plant from photosynthesising leaves to non-photosynthesising regions in the roots and stem

Question 9

Active transport

Answer 9

Movement of particles from an area of lower concentration to an area of higher concentration against the concentration gradient due to external energy

Question 10

Translocation

Answer 10

movement of sucrose and amino acids in phloem from regions of production to regions of storage, regions where they are used for respiration or growth (sink)