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.

Assertion (A): Abscisic acid promotes stomatal closure during a drought. Reason (R): Abscisic acid helps the plant to conserve water during stress. (a) (A) is true and (R) is false (b) (A) is false and (R) is true (c) Both (A) and (R) are true and (R) is the correct explanation of (A). (d) Both (A) and (R) are true and (R) is not the correct explanation of (A).

(a) Who proposed the theory of Natural Selection? (b) Name the organism which was used as an example to explain Industrial Melanism.

What is the role of the following? (a) Leydig cells (b) Seminiferous tubules

A 28-year-old pregnant lady goes to a gynecologist for a check-up. Her doctor explains that there is normal growth of the foetus and the placenta is functioning well. (a) Mention one function of the placenta. (b) What connects the placenta to the foetus?

Arrange the following food chains in a proper sequence. (a) Small fish, Algae, Mosquito larvae, Kingfisher (b) Frog, Snail, Crow, Green leaves

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.

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.

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

Pick the odd one out and name the category to which the remaining three belong: (a) Prothrombin, Thrombin, Fibrinogen, Albumin (b) Tonsils, Glomerulus, Spleen, Lymph nodes (c) Neutrophils, Basophils, Monocytes, Eosinophils (d) Leaves, Styrofoam, Grass, Cow dung (e) Pulmonary artery, Renal artery, Coronary artery, Hepatic artery

Arrange the following in a logical sequence: (a) Australopithecus, Cro-Magnon, Homo erectus, Neanderthal man. (b) Pupil, Aqueous humour, Retina, Vitreous humour. (c) Effector, Receptor, Motor neuron, Sensory neuron. (d) Loop of Henle, Distal convoluted tubule, Bowman’s Capsule, Proximal convoluted tubule. (e) Water vapour, Soil water, Leaves, Ascent of Sap.

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.