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)
Input and output nerves meet at:
Brain
Spinal cord
Muscles
Heart
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
The underactive endocrine gland which causes goitre is:
pancreas
thyroid
adrenal
pituitary
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
Blinking of eyes is an example of
diseases
habit
reflex action
response
The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of:
nastic movement
geotropism
A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of:
hydrotropism
phototropism
The gap between two neurons is called a:
dendrite
synapse
axon
impulse
The other name of movements independent of growth is:
Nastic movements
Non-directional
Tropic
Both (a) and (b)
