1.1.3 Excretion

Question 1

Chemical reactions that take place inside living cells are described as what?

Answer 1

metabolic reactions

Question 2

What do Metabolic reactions produce

Answer 2

Waste Products, some of which may be toxic

Question 3

Do the Waste Products from the Metabolic Reactions need to be removed?

Answer 3

yes, they need to be eliminated from the body

Question 4

What is Excretion

Answer 4

Excretion is the removal of toxic materials and substances from organisms

Question 5

Name 3 Waste products excreted from Animals

Answer 5

Carbon dioxide from respiration, Water from respiration and other chemical reactions, Urea which contains nitrogen resulting from the breakdown of proteins.

Question 6

Name 3 Waste products excreted from Plants

Answer 6

Oxygen from photosynthesis, Carbon dioxide from respiration, Water from respiration and other chemical reactions.

Question 7

At what point in the day is Carbon Dioxide Excreted?

Answer 7

Night time, Carbon Dioxide is excreted at night when the rate of respiration exceeds the rate of photosynthesis.

Question 8

At what point in the day is Oxygen excreted?

Answer 8

Day time, Oxygen is excreted in the day when the rate of photosynthesis exceeds the rate of respiration.

Question 9

At what point in the day is Water Vapour excreted

Answer 9

Night time and Day time Water Vapour is excreted through transpiration.