Theory 3

Question 1

Explain why plants take up carbon dioxide during photosynthesis.

Answer 1

CO2 is a reactant. Concentration of CO2 is higher outside leaf, so diffuses into leaf.

Question 2

Predict and explain what would happen to the rate of photosynthesis if the investigation is
continued at temperatures higher than 45°C, which is the temp the plant lives at.

Answer 2

rate slows, stomata close so little CO2 enters

Question 3

testis function

Answer 3

produces sperm

Question 4

sperm duct function

Answer 4

transports sperm but not urine

Question 5

urethra function

Answer 5

passage of urine and seminal fluid through penis

Question 6

prostate gland function

Answer 6

secrete seminal fluid

Question 7

scrotum function

Answer 7

contains testes

Question 8

bladder function

Answer 8

stores and releases urine into urethra

Question 9

epididymus function

Answer 9

stores sperm

Question 10

erectile tissue function

Answer 10

obtains blood to keep penis erect

Question 11

DNA removed from a bacterial cell

Answer 11

plasmid

Question 12

Explain why it is important that only some of the genes in cell A are expressed in these cells.

Answer 12

Plants have specialised cells which have different functions. Only specific proteins are required.

Question 13

cortex function

Answer 13

blood is filtered

Question 14

function