How macula lutea and corpus luteum are related ?

(1) Contribute in maintain pregnancy 

(2) Both are a source of hormones

(3) Both are characterised by their yellow colour 

(4) Both are found in human ovaries 

The cornea is a very important component of the human eye. The main function of the cornea is to
(1) bend the light before it reaches the lens

(2) provide structural support to the eye

(3) contain a concentrated amount of cone cells in the correct orientation

(4) change the shape of the lens to enable the image to be focused on the retina

Animals possess nerve networks or nervous systems to respond to their environment. But
the single celled Amoeba does not possesses any nerve cell, so, how it come to know
whether a particle it encounters is a grain of sand and not its dinner?

(1) By chemotaxis

(2) By skin

(3) By hormones

(4) All of these

Assertion   :       Circular smooth muscles of iris contract when bright light falls on the eye.

Reason      :       Pupil gets constricted by the contraction of circular smooth muscles of iris.

Assertion :      Tongue is a gustatoreceptor.

Reason    :       Receptors for gustatory sensations are located in the taste bund.

Assertion    :       All of the cranial nerves are said to be mixed nerves.

Reason      :       All cranial nerves carry both sensory and motor nerve fibres simultaneously.

Assertion   :       The chemical stored in the synaptic vesicles are termed as neurotransmitters.

Reason      :       Synaptic vesicles release these chemicals in the synaptic cleft.

Assertion    :       Nerve impulse can never be transmitted from dendrite or cell body of one neuron to the axon of the next neuron, across a synapse.

Reason      :       This happens because of the synaptic delay at each synapse.

Assertion   :       Nerve conduction is the one way conduction.

Reason      :       Nerve impulse is transmitted from dendrite terminals to axon terminals.

Assertion    :       After hearing a sound, nerve impulse passes from neurons to the brain.

Reason      :       The neurons which pass nerve impulses from the body organ to the brain is called afferent neuron.