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SECOND PRE BOARD EXAMINATION JANUARY 2016 Class: X Time: 2Hrs Subject: BIOLOGY Max Marks: 80 ______________________________________________________________________________________ Attempt all the questions from Section I and any four questions from Section II . The intended marks for questions or parts of questions are given in brackets ( ). SECTION I (40 MARKS) (Attempt all questions from this Section) Question 1 (a) Name the following: (5) i. ii. iii. iv. The folds of inner wall / layer in mitochondria. The light rays absorbed from the visible spectrum by the chlorophyll for photosynthesis. The vaccine given to babies that helps build immunity against three diseases. Artificially introducing weakened germs or germ substances into the body for developing resistance to a particular disease. v. The mineral element required by plants in the formation of chlorophyll. (b) State whether the following statements are true or false. If false, write the correct form of the statement by changing the underlined words only. (5) i. ii. iii. iv. v. The thyroid gland is both exocrine and endocrine in function. Mortality is the number of deaths per thousand of the population per decade. The process of fusion of the sperm nucleus and the egg nucleus is termed implantation. Rods are responsible for vision in the light. Dilation of the pupil is brought about by the sympathetic nervous system. (c) The following paragraph is related to transpiration by plants. Copy and complete the following paragraph by selecting the correct word from those given in the box. You may use the term only once. (5) Cuticle, stoma, lesser, greater, close, open and lenticels Stomatal transpiration is controlled by the plants by adjusting the size of the ___1______, whereas this does not happen in the case of cuticular and lenticular transpiration. _____2_____ is a waxy layer secreted by the epidermis on the two surfaces of the leaf. The ___3______ the thickness of the cuticle, the _____4______ is the evaporation (transpiration). ______5_____ are special openings that develop on the older stem in place of stomata. Lenticels never ____6_____. They remain ______7___ all the time. (d) Name the fluid that: i. ii. iii. iv. v. (5) Protects and nourishes the brain. Filters out into the Bowman s capsule under pressure. Protects the developing embryo. Kills the germs in the eyes. Helps to transport hormones. (e) Mention the location of the following structures and give their respective functions (if any): (10) i. ii. iii. iv. v. Node of Ranvier. Ciliary muscles. Epididymis. Palisade mesophyll cells. Hydathodes. 1
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