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.

Name the following: (a) The fully developed part of the ovary containing a mature ovum. (b) A waxy layer on the upper epidermis of leaves meant to reduce Transpiration. (c) The ear ossicle which opens into the oval window of Cochlea. (d) The physiological process which is the starting point of all food chains. (e) An insect which is a classic example of natural selection due to industrial melanism.

Given below is an outline of the human body showing the important endocrine glands. Match the glands marked (a) to (e) with their correct functions: Example: (f) – 6. Secretes Testosterone. Endocrine Gland Functions (1) Prepares the body to face stress. (2) Secretes tropic hormones (3) Secretes Oestrogens (4) Maintains blood sugar level (5) Regulates basal metabolism (6) Secretes Testosterone.

Given below is the diagram of a human heart. Read the information below the diagram and fill in the blanks: The human heart pumps blood throughout the body. It is the size of a large fist. The heart is located between the lungs in the thoracic cavity. It has four chambers. The heart functions all through the lifespan of a person and is responsible for the survival of the person. The heart is enclosed by a membrane called (a) ............... . The ventricles give rise to two large blood vessels called (b) ............... and (c) ............... . The flaps of the cuspid valves are kept in position by (d) ............... . (e) ............... arteries supply oxygenated blood to the walls of the heart.

Assertion (A): Seminal vesicles pour an alkaline secretion into the semen as it passes through the ureter. Reason (R): The female vagina is acidic and needs to be neutralized for sperm survival. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False

Assertion (A): Deficiency of Antidiuretic hormone causes an increase in urination. Reason (R): Antidiuretic hormone acts on the kidney to reabsorb water from the kidney tubules. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False

Assertion (A): Arachnoid layer helps in speeding up the transmission of nerve impulses along the axons. Reason (R): Axon endings at the synapse secrete acetylene. (a) A is True and R is False (b) A is False and R is True (c) Both A and R are True (d) Both A and R are False

Observe the following picture, identify the defect and the cause of the defect. (a) Simple goitre, under secretion of thyroxine. (b) Ex-ophthalmic goitre, over secretion of thyroxine. (c) Simple goitre, over secretion of thyroxine. (d) Ex-ophthalmic goitre, under secretion of thyroxine.

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.

Match the items in Column I with those in Column II: Column I Column II Leydig cells Lack of thyroxine in children Stoma 12 pairs Ova Testosterone Cranial nerve Diffusion of respiratory gases Cretinism Haploid cells 31 pairs Diploid cells

Given below is the diagram of a human sperm. Read the information below the diagram and fill in the blanks: Living organisms reproduce to form new individuals of their own kind. This is essential for the survival and continuation of species. Human sperms are microscopic structures that carry genetic material. The head of the sperm has a cap like organelle called (a) ............... (Lysosome / Acrosome) which produces an enzyme (b) ............... (Hyaluronidase / Amylase) that dissolves the outer layer of the ovum to facilitate fertilisation. The nucleus of the sperm has (c) ............... (23 / 46) chromosomes. The middle piece has (d) ............... (Chloroplast / Mitochondria) to provide energy for the motility of the sperm. (e) ............... (Semen / Hymen) is a mixture of sperms and the fluids produced by the male accessory glands.

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.