Blinking of eyes is an example of
diseases
habit
reflex action
response
Dwarfism results due to
excess secretion of thyroxine
less secretion of growth hormone
less secretion of adrenaline
excess secretion of growth hormone
All the voluntary actions of our body are controlled by:
cerebrum
cerebellum
pons
medulla
Which of the following are cerebral reflexes?
I) a person pulls away his hand on touching a hot objectii) a person spits out immediately when a fly enters his mouth while talkingiii) a person walking bare foot lifts his foot at once on stepping on to a nailiv) a person's pupil contracts at once in the presence of bright light
I) and ii)
ii) and iii)
iii) and iv)
ii) and iv)
Which of the following statements are true?
1 and 2
1 and 3
1 and 4
1,2 and 3
When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of:
chemotropism
thigmonasty
photonasty
thigmotropism
Most of the plant hormones promote plant growth. A plant hormone which inhibits growth is:
abscisic acid
ethene
ascorbic acid
cytokinin
Which of the following is a plant hormone?
Insulin
Thyroxine
Oestrogen
Cytokinin
One of the following gives the correct sequence of the components in a reflex arc. This is :
Receptors → Muscle → Sensory neuron → Motor neuron → Spinal cord
Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
One of the following statements is not true about thyroxine. This is:
Thyroid gland requires iron to synthesise thyroxine
It regulates carbohydrate, protein and fat metabolism
Iodine is essential for the synthesis of thyroxine
Thyroid gland can enlarge due to lack of thyroxine