Excretion

Question 1

Excretion is ?

Answer 1

The removal of toxic materials and substances from organisms

Question 2

Waste products excreted by animals include:

Answer 2

• Carbon dioxide from respiration
• Water from respiration and other chemical reactions
• Urea which contains nitrogen resulting from the breakdowns of proteins

Question 3

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

Answer 3

Metabolic reactions

Question 4

Metabolic reactions produce waste products, some of which may be ?

Answer 4

Toxic

Question 5

The skin ?

Answer 5

Excretes water and mineral ions

Question 6

The lungs

Answer 6

Excrete carbon dioxide and water

Question 7

The Liver

Answer 7

Produces urea from amino acids

Question 8

The Kidneys

Answer 8

Excrete water with mineral ions and urea

Question 9

Waste products excreted by plants include

Answer 9

• Oxygen from photosynthesis
• Carbon dioxide from respiration
• Water from respiration and other chemical reactions

Question 10

When the rate of respiration exceeds the rate of photosynthesis what is excreted and is it day or night ?

Answer 10

Carbon dioxide is excreted, and its night

Question 11

When the rate of photosynthesis exceeds the rate of respiration what is excreted and is it day or night ?

Answer 11

Oxygen is excreted, and its day

Question 12

Water ——– is excreted through ——–

Answer 12

Vapour, transpiration