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
Which of the following is a plant hormone?
Insulin
Thyroxine
Oestrogen
Cytokinin
In a synapse, chemical signal is transmitted from:
axon to cell body of the same neuron
cell body to axon end of the same neuron
dendrite end of one neuron to axon end of adjacent neuron
axon end of one neuron to dendrite end of adjacent neuron
A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to
water and light
water and minerals
gravity and water
light and gravity
Blinking of eyes is an example of
diseases
habit
reflex action
response
Which of the following statements are true?
1 and 2
1 and 3
1 and 4
1,2 and 3
The gap between two neurons is called a:
dendrite
synapse
axon
impulse
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
All the voluntary actions of our body are controlled by:
cerebrum
cerebellum
pons
medulla
The other name of movements independent of growth is:
Nastic movements
Non-directional
Tropic
Both (a) and (b)