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STD: X TIME: 2 hrs. SECOND PRELIMINARY EXAMINATION 2020-2021 BIOLOGY DATE: 05.02.2021 MARKS: 80 Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15minutes. This time is to be spent in reading the question paper. ____________The time given at the head of this paper is the time allowed for writing the answers. ____________ This paper comprises of two sections - Section I and Section II. Attempt all the questions from Section I. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in brackets []. This paper consists of six printed pages. Nothing should be written on this question paper. SECTION I (40 Marks) Attempt all questions from this section. Question 1 a) State whether the following statements are true or false. If false, rewrite the correct statement. (i) (ii) (iii) (iv) (v) [5] The pancreas is the largest endocrine gland. Hypothalamus is the part of midbrain. Destarching of plant is done by keeping plant in the dark for 24-36 hours. Chordae tendinae is also called as yellow spot. Water and minerals coming out of root hair is called as cell sap. b) Given below is an example of a certain structure and its special functional activity. On a similar pattern fill in the blanks with suitable functions: Example: Chloroplast and photosynthesis (i) Xylem and . (ii) Ciliary body and . (iii) Semicircular canal and . (iv) Thyroid gland and . (v) Eustachian tube and . [5] c) Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words:[5] (i) ___________ is secreted by the ( ii) _______________ lobe of the pituitary gland. If this hormone secretion is reduced, there is an increased production of urine. This disorder is called (iii) . Sometimes excess glucose is passed with urine due to hypo secretion of another hormone called (iv)___________ leading to the cause of a disease called (v) . Cont d on page 2 . 1
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