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]

Ahmed had a severe throat infection. After a few days he developed an earache too. What could be the reason for the pain in his ears? Explain.

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

Owls are nocturnal animals. They are active at night and hunt small animals for food. Owls have large eyes and can see well at night. This is due to: (a) Cones and Rhodopsin (b) Rods and Iodopsin (c) Rods and Rhodopsin (d) Cones and Iodopsin

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

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

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

Which ear ossicle transports sound from the tympanum to the inner ear? (a) Stapes (b) Malleus (c) Incus (d) Cochlea

Arrange and rewrite the terms in each group in correct order to be in a logical sequence beginning with the term that is underlined: (a) Snake, Rabbit, Cabbage, Hawk. (b) Xylem, Soil water, Cortical cells, Root hair. (c) Receptor, Response, Effector, Spinal Cord. (d) Fovea, Lens, Cornea, Conjunctiva. (e) Testis, Urethra, Sperm duct, Epididymis.

Vitreous humour is present between: (a) Cornea and Iris (b) Lens and Retina (c) Iris and Lens (d) Cornea and Lens

Choose the odd one out from the following terms and name the category to which the others belong: (a) Used bandages, Pesticides, Face masks, Syringes. (b) Dust, Smoke, Carbon monoxide, Effluents (c) Uterus, Urethra, Urinary bladder, Ureter (d) Menstrual phase, Telophase, Follicular phase, Luteal phase (e) Malleus, Incus, Cochlea, Stapes

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.