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MOCK EXAMINATION 2021 BIOLOGY Grade : 10 Time : 2 hrs. Date: 18/03/2021 Max. Marks : 80 -------------------------------------------------------------------------------------------------------------------------------------INSTRUCTION Answers 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 questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. This Question paper has 9 printed pages. SECTION I (40 Marks) (Attempt all questions from this section) Question 1 A. Name the following: [5] (i) Cloudiness of the lens of the eye that leads to a decrease in vision. (ii) The part of the brain responsible for respiration. (iii) The phase of the cardiac cycle where the auricles and the ventricles are relaxed. (iv) The process of passing out of urine from the body. (v) The organ where urea is formed. Page 1 of 10 B. Given below is a table consisting of a set of items belonging to a common category. Copy the table and compete the blanks by filling in the odd one and the category to which the other three belongs [5] S.No. Set Example Lion, whale, human, frog (i) (ii) Dilation of pupil, increased heart rate, production of adrenaline, stimulates digestion Egg membrane, goat bladder, cellophane paper, filter paper (iii) Melanin, Iris, Ciliary muscles, photoreceptor cells (iv) Midbrain, Pons, Cerebrum, Medulla (v) Phosphate, RNA, Thymine, Ribose Odd one Category Frog mammals C. State the exact location and function of the following structures: (i) Lenticels (ii) Centromere (iii) Oval window (iv) Papillary muscles (v) Stroma D. Given below are set of five terms. In each case rearrange them in logical sequence: [5] [5] (i) cochlea, Malleus, Stapes, oval window, tympanum. (ii) Root hair cell, pericycle, endodermis, xylem, cortex. (iii) Placed in sunlight, leaf boiled in alcohol, washed in water, iodine added, destarched plant (iv) macula, pupil, vitreous humour, optic nerve, eye lens (v) SA node, Ventricles, AV node, Bundle of HIS, Purkinje fibers Page 2 of 10 E. Differentiate between the following pairs based on what is given in the brackets: (i) Diapedesis and phagocytosis (significance) (ii) cones and rods (function) (iii) Hypotonic solution and Hypertonic solution (composition) (iv) Imbibition and diffusion (definition) (v) Lymphocytes and Neutrophilis (Structure of nucleus) F. Fill in the blanks with suitable words/phrases [5] [5] (i)------is the antimicrobial present in the tears (ii)------is the iron containing pigment in erythrocytes. (iii)-----located on the RBC is responsible for the determination of blood group. (iv) ----- is the responsible for the water molecules to draw the water column up the xylem (v) ------is the blood plasma with the blood cells and clotting proteins removed. G. The diagram below represents an organ in the human body. Study the same and then answer the questions that follow: [5] (i) Account for the hydrostatic pressure developed in the structure 4. (ii) What is the role of ADH on the structure 1? (iii) Name two substances that do not move into the structure 4 from the glomerulus. (iv) What is the role of kidney in our body? (v) Name any two structures found in the renal hilum. Page 3 of 10 H. Note the relationship between the first two words and suggest the suitable word/words for the fourth place [5] (i) Loop of henle : Renal medulla :: DCT : -------------------------------(ii) Axon : Nerve :: Cyton : -----------------------------(iii) Stomata : transpiration :: Hydathodes : ----------------------(iv) water molecules : osmosis :: mineral nutrients : -----------------------(v) Cactus : leaves reduced to spines :: Nerium ------------------------------- SECTION II (40 Marks) (Attempt any four questions from this section) Question 2 A. Observe the experimental set up described below then answer the questions that follow: [3] (i) Is the experimental leaf monocot or dicot? How do you know? (ii) What would you observe in the experimental set - up after a few hours? Give reason to support your answer. B. Draw a neat-labelled diagram of guard cells with stomata as seen on a bright sunny day. [2] C. Given below is a schematic diagram of a portion of DNA. (i) Name the parts numbered 1 and 5 respectively. (ii) Name the DNA unit constituted by the parts 1, 2 and 3 collectively. (iii) How many nucleotide pairs do you see in the picture? (iv) Differentiate between nucleotide and nucleosome. (v) Who proposed the double helical model of DNA? (vi) Name the process by which identical DNA molecules are synthesized in the cell. Page 4 of 10 [5] Question 3 A. The given diagram refers to an experiment in which the apparatus was set up with light source 10 cm away from the plant. After 15 minutes the number of bubbles evolved per minute from the cut stem was recorded. The light source was moved to 20 cm away from the plant for 15 minutes and the number of bubbles evolved per minute was again recorded. The experiment was repeated with the source of light at distances of 40, 60, 80 and 100 cm away from the plant. The result obtained were recorded on the graph. Select the correct answer out of the available choices given under each question: P a g e 5 of 9 [5] B. Give scientific reason for the statements given below: (i) [5] If you stand to make your maiden speech before a large audience your mouth dries up and heart rate increases. (ii) Arteries are deep seated. (iii) Transmission of impulse in neuron is unidirectional. (iv) Pickling keeps food edible for long period of time. (v) Photosynthesis is a physiological process that needs optimal temperature to operate. Question 4 A. Define the following terms. (i) [5] Karyokinesis (ii) Osmoregulation (iii) Ascent of sap (iv) Pulse (v) Conditioned reflex B. Given below is a diagrammatic representation of certain types of blood vessels in human body. [5] (i) Identify the types of blood vessels numbered 1 and 3. (ii) Differentiate between the blood vessels 2 and 5 based on their composition. (iii) Draw a neat, labelled diagram of the cross section of the blood vessel 3. (iv) How is the blood vessel 4 adapted to carry out the function? P a g e 6 of 9 Question 5 A. Study the diagram below and then answer the questions that follow. [5] (i) What is the aim of the experiment? Justify your answer. (ii) Why is Vaseline used in the experiment? (iii) It is necessary to de-starch plant A and plant B. Give reason. (iv) Give the confirmatory test to prove the aim of the experiment. (v) Will the result be affected if the setup is placed in a dark room? Give reason to explain your answer. B. Answer the following questions: [5] (i) What is the significance of photochemical reaction that occurs in the plants during the photosynthesis? (ii) Reflex actions are useful. Why? (iii) Draw a duplicated chromosome and label its parts. (iv) Give any two limitations of Ganong s potometer. Question 6 A. State true or false. Identify the false statements and rewrite them correctly by changing the last word/s only. [5] (i) Nitrogenous wastes are produced due to the deamination of fats. (ii) The wall of the guard cells towards the epidermal cell is thick. (iii) The hypersecretion of insulin results in diabetes mellitus. (iv) The pollen grains are formed in the flower through the process of meiosis. (v) Insulin cannot be administered orally as it is a steroid hormone. P a g e 7 of 9 B. Given below is a schematic representation of the circulatory system in man. Study the same and then answer the questions that follow: (i) Label the parts 1, 3 and 4 indicated in the diagram. (ii) Give one difference between the parts 1 and 2 based on: a. Their structure b. The nature of blood flowing through them. (iii) Define this type of blood circulation that takes place in the circulatory system. (iv) Name the valve found at the beginning of the part labelled 3. Question 7 A. Study the diagram below and then answer the questions that follow. (i) Name the endocrine gland shown in the diagram. (ii) Name the hormone secreted by the gland and state its role. (iii) Name mineral elements required for the normal functioning of this endocrine gland. (iv) Name the gland and its hormone that controls this endocrine gland. (v) Name the disease due to the hypo and hypersecretion of this gland in adults. P a g e 8 of 9 [5] B. With reference to the functioning of a human eye, answer the questions that follow: (i) Name the structures that bring about the change in the focal length of lens during accommodation. (ii) Why does one feel blinded for a short time after steeping out of a dark room? (iii) Give one function each of the two chambers of the eye. (iv) Which part of the donated eye is grafted and used during transplant? (v) Name the region of distinct vision in the eye. -----------------xxx----------------- P a g e 9 of 9
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