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Mercy Memorial School, Kanpur Class: X Date: 08. 02. 2023 Preliminary Examination 2022 - 2023 BIOLOGY SCIENCE - (PAPER - 3) MM 80 Time: 2 Hrs Answer to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. 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. Attempt all questions from Section I and any Four from Section II. The intended marks for questions or parts of questions are given in brackets []. SECTION 1[40 MARKS] (Attempt all questions from this section) QUESTION-1 Choose the correct answer from the options given below1.Chromosome are composed of a) Protein only b) DNA only c) DNA and proteins d) RNA only 2. Which of the following terms represents a pair of contrasting characters? a) Allele b) Phenotype c) Homozygous d) Heterozygous 3. Water will be absorbed by the root hairs when: a) Concentration of salts in the soil is high b) Concentration of solute in the cell sap is high c) The plant is rapidly respiring d) They are separated from the soil by a semi permeable membrane 4. Wilting of plants occurs due to excessive: a) Photosynthesis b) Transpiration c) Absorption d) Respiration 5. A molecule which is broken down during the light reaction of Photosynthesis is: a) Oxygen b) Chlorophyll c) Water d) Carbon dioxide 6. The rate of photosynthesis is not affected by the : a) Light intensity b) Humidity c) Temperature d) Carbon dioxide concentration 7. The movement of shoot towards the light stimulus is called: a) Geotropism b) Hydrotropism c) Chemotropism d) Phototropism [15]
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