True or false

Question 1

True or False: A reflex arc
involves conscious
thought from the brain.

Answer 1

False
Explanation: Reflexes are involuntary
and bypass conscious areas of the
brain for a rapid response.

Question 2

True or False: IAA
causes cell elongation
in the shaded side of a
shoot.

Answer 2

True
Explanation: IAA accumulates on the
shaded side, promoting cell
elongation, causing the shoot to bend
towards the light.

Question 3

True or False: During
an action potential,
sodium ions diffuse
out of the axon.

Answer 3

False
Explanation: Sodium ions diffuse in,
causing depolarisation.

Question 4

True or False: The
refractory period ensures
action potentials travel in
one direction only.

Answer 4

True
Explanation: It prevents the membrane
from being immediately re-stimulated,
ensuring unidirectional transmission.

Question 5

True or False: Myosin
heads bind to actin when
calcium ions are present
and tropomyosin is
moved.

Answer 5

True
Explanation: Ca2+ causes tropomyosin
to move, exposing binding sites on
actin.

Question 6

True or False: Type 2
diabetes is caused by an
autoimmune response
destroying beta cells.

Answer 6

False
Explanation: That describes type 1
diabetes. Type 2 is caused by insulin
resistance and often linked to
lifestyle.

Question 7

True or False: The loop of
Henle maintains a high
water potential in the
medulla to help water
reabsorption.

Answer 7

False
Explanation: It maintains a low water
potential in the medulla, creating a
concentration gradient for water
reabsorption from the collecting duct.

Question 8

True or False: Glycogen in
muscle cells provides a
local supply of glucose for
respiration during
contraction.

Answer 8

True
Explanation: Glycogen is broken down
into glucose to provide energy for
muscle contraction, especially during
exercise.