Excretion

Question 1

What is excretion?

Answer 1

the removal of waste products of metabolic reactions ( respiration, photosynthesis, digestion- chemical reactions)

Question 2

how is CO2 removed in animals

Answer 2

breathing system ( exhale)

Question 3

how is O2 removed in plants

Answer 3

through the stomata

Question 4

how is water removed from animals

Answer 4

excretory system ( urine) - blood, kidneys, bladder, urine

Question 5

how are excess salts removed in animas?

Answer 5

excretory system ( urine) + sweat

Question 6

How is urea removed in animals?

Answer 6

Excretory system ( urine)

Question 7

what is the excretory organ for CO2?

Answer 7

Lungs

Question 8

what is the excretory organ for urea?

Answer 8

kidney

Question 9

what is the excretory organ for water

Answer 9

kidney ( plus sweat glands)

Question 10

what is the excretory organ for mineral ions? ( iron calcium

Answer 10

kidney ( plus sweat glands)

Question 11

where do humans gain water from?

Answer 11

water in food, drinking , cellular respiration

Question 12

where do humans lose water?

Answer 12

urine, sweating/ exhalation and egestion of faeces

Question 13

are faeces excreted?

Answer 13

NO!! they are a product of egestion!!

Question 14

what is urea

Answer 14

Urea is produced in the liver when excess amino acids are broken down. Urea is the main waste product removed in the urine, as it is not reabsorbed in the kidney.

Question 15

how do plants remove chemicals that are not required?

Answer 15

Plants may produce chemical substances that are not required and cannot be converted into useful compounds. These unwanted products can be stored in dying tissues, such as leaves in the autumn, before being shed