Rajat Singh was working as a supervisor in a stone quarry where rock, sand and gravel are extracted by techniques like digging, drilling and blasting. As the years rolled by, Rajat started facing a loss in hearing. The high decibel sounds had damaged a part of his internal ear, though the tympanic membrane was intact. (a) What is the collective term for the structures of the internal ear? (b) Name the sensory organ in the cochlea that was damaged. (c) Name the type of pollution responsible for this condition.

Karan was standing on a high stool and cleaning the ceiling fan. He suddenly loses balance and sustains a head injury. An examination reveals that his pupils have lost the capacity to constrict in bright light. Which structure has been damaged? (a) Suspensory ligaments (b) Medulla oblongata (c) Eye lens (d) Eye lid

Give the biological/technical terms for the following: (a) The tropic movement wherein the tendrils of a pea plant twine around a support. (b) A defect in our eye in which some parts of the object are in focus while the other parts are blurred. (c) The type of waste generated in hospitals and pathological laboratories. (d) The surgical technique for females that can be used to prevent pregnancy. (e) The evolutionary process by which new species arise from the existing one.

Given below is the picture of an eagle. Eagles have binocular vision. What is the advantage of such a vision?

Mohan is fond of playing basketball. His concentration is on shooting the ball into the opponent’s basket as given in the picture. (a) Which part of the brain helps Mohan to concentrate in putting the ball into the basket? (b) Name the sense organ that helps to gauge the distance between the ball and the basket. (c) Name the part of the brain that co-ordinates all the voluntary muscles of his body.

A teacher drew the diagram of heart on the blackboard and told the students to copy it in their notebooks. Mahesh couldn’t see the diagram clearly as it appeared blurred to him. (a) Name the defect of the eye Mahesh is suffering from. (b) Where is the image formed in this defect? (c) Mahesh consults an eye doctor and is prescribed suitable lenses to correct the defect. Which type of lens do his spectacles have?

The structure that lies at the junction of the choroid and the iris and is itself a part of the choroid is called: (a) Ciliary body (b) Suspensory ligament (c) Pupil (d) Lens

Rachna is an expert gymnast on the balance beam. She has been vigorously practising for the Olympic Games. Lately, she has been experiencing dizziness and losing her balance during the practice sessions. (a) Which part of the membranous labyrinth is responsible for maintaining the body balance on the beam? (b) Which type of balance is maintained by the structure mentioned in (a)? [Space for diagram]

Name the following: (a) Unicellular outgrowths of the epidermis of roots. (b) The defect of the eye in which some parts of an object are focused while other parts appear blurred. (c) The tropic movement in response to chemicals. (d) The main nitrogenous waste in the human body. (e) The attachment of the fertilized ovum to the wall of the uterus.

Which part of the eye adjusts the focal length of the eye lens? (a) Cornea (b) Iris (c) Ciliary muscles (d) Sclera

Read the explanations given below and name the structures: (a) The canal through which the testes descend down into the scrotum just before the birth of a male baby. (b) The part of the brain that regulates the peristaltic movement of the alimentary canal. (c) A structure that collects the soundwaves and conducts them through the external auditory canal. (d) The point of attachment of two chromatids of a chromosome. (e) Regulation of the opening and closing of stomata.

Which parts of the ear are responsible for: (a) Static equilibrium? (b) Dynamic equilibrium?