Redraw the picture given below. Identify the name indicated and label the parts The part that adjusts its size as the intensity of light varies.

The human eyes play an essential role in the formation and processing of the image in the brain of the human. This sensory organ is composed of different parts. The pupil can be characterised as a small opening in the iris. The pupil adjusts its size according to the intensity of the light. The pupil’s function is to adjust the amount of light entering the eye.

The diagram below shows a mammalian eye as seen from front: What has caused from A to B?

The effect of light causes the pupil to become smaller and larger. Movement of iris controls the size of pupil. In A the pupil has become larger as the light is dim. In B the pupil has become smaller as the light is bright.

Given below is a display of certain parts of an organ: Name the organ where these parts are present.

The middle ear is the part of the ear between the eardrum and the oval window. The middle ear's function is to transmit sound from the outer ear to the inner ear. The middle ear contains three ossicles called malleus, incus and stapes which are attached to one another in a chain-like fashion. The malleus is attached to the tympanic membrane and the stapes is attached to the oval window of the cochlea. The ear ossicles increase the efficiency of transmission of sound waves to the inner ear. An Eustachian tube connects the middle ear cavity with the pharynx. The Eustachian tube helps in equalising the pressures on either sides of the ear drum.

Given below is a display of certain parts of an organ: State the function of this particular part of the organ shown in the diagram.

The middle ear is the part of the ear between the eardrum and the oval window. The middle ear's function is to transmit sound from the outer ear to the inner ear. Structure Function Malleus, Incus and Stapes The function of the tympanic membrane and the auditory ossicles is to transmit and amplify sound and to convert sound waves into pressure waves in the perilymph and endolymph. Eustachian tube The primary function of the Eustachian tube is probably to optimise sound transfer through the middle ear to the inner ear by facilitating gas transfer and pressure equalisation between the middle ear and the nasopharynx. perilymph and endolymph. Round window and oval window In the middle ear, the round window vibrates in the opposite phase to the vibrations entering the inner ear through the oval window.

Which if the following statement isare incorrect

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Reflex actions occur when the following incidents happen in the everyday life of a human. Give the importance of these two reflex actions:

(i) When food particles enter into the trachea

(ii) When foreign particles enter inside the nasal cavity

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Redraw the picture given below. Identify the name indicated and label the parts

Question Image

The part that adjusts its size as the intensity of light varies.

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Certain hormones released from the anterior lobe of pituitary gland are given.
Thyroid Stimulating Hormone (TSH)
Adreno Cortico Tropic Hormone (ACTH)
Gonado Tropic Hormone (GTH)

Write one function of ACTH and TSH.

MEDIUM

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Mention the exact location of the following:
(iii) Malleus

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Certain hormones released from the anterior lobe of pituitary gland are given.
Thyroid Stimulating Hormone (TSH)
Adreno Cortico Tropic Hormone (ACTH)
Gonado Tropic Hormone (GTH)

Write the common feature of these hormones.

MEDIUM

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Mention the exact location of the following

Incus.

MEDIUM

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Why do the pilots not undertake their duties when suffering from bad cold ?

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Explain the following "Iris".

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Which among these adjusts the light entering the eye?

MEDIUM

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

A doctor was examining his patient for ailment in eye. Doctor focussed light from a brightly lit torch on the pupil of the patient. The patient yelled he is unable to see the light from the torch. What may be the reason?

MEDIUM

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

Mention the function of Eustachian tube.

EASY

Life Sciences>From Molecules to Organisms: Structures and Processes>Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.>Information Processing - Each sense receptor responds to different inputs (electromagnetic, mechanical, chemical), transmitting them as signals that travel along nerve cells to the brain. The signals are then processed in the brain, resulting in immediate behaviors or memories.

The diagram below shows a mammalian eye as seen from front:

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