Homeostasis

Question 1

hormone

Answer 1

a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organs

Question 2

state the hormones they
secrete

Answer 2

(a) adrenal glands and adrenaline
(b) pancreas and insulin; glucagon
(c) testes and testosterone
(d) ovaries and oestrogen

Question 3

adrenaline

Answer 3

the hormone secreted in ‘fight or flight’ situations and its effects

Question 4

adrenaline effects

Answer 4

a) increased breathing rate
(b) increased heart rate
(c) increased pupil diameter

Question 5

role of adrenaline in the control of
metabolic activity

Answer 5

a) increasing the blood glucose concentration
(b) increasing heart rate

Question 5

role of adrenaline in the control of
metabolic activity

Answer 5

a) increasing the blood glucose concentration
(b) increasing heart rate

Question 6

homeostasis

Answer 6

the maintenance of a constant internal environment

Question 7

insulin

Answer 7

decreases blood glucose concentration

Question 8

gravitropism

Answer 8

a response in which parts of a plant grow towards or away from gravity

Question 9

phototropism

Answer 9

a response in which parts of a plant grow towards or away from the direction of the light source

Question 10

role of auxin in controlling shoot growth

Answer 10

(a) auxin is made in the shoot tip
(b) auxin diffuses through the plant from the
shoot tip
(c) auxin is unequally distributed in response to
light and gravity
(d) auxin stimulates cell elongation