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MOCK EXAMINATION - 2019 SUBJECT: BIOLOGY Grade: 10 Date: 28.12.2019 Time: 2 Hours Max. Marks: 80 INSTRUCTIONS Answers to this paper must be written on the paper provided separately. You will not be a//owed to write during the first 15 minutes. This I/me is to be spent in reading the question paper. The time given at the head of the paper is the time allowed for writing the answers. Attempt a// questions from Section A and any four questions form Section B. Section A contains one question with eight parts A to H. Section B contains six questions, you have to answer any four questions. The intended marks of questions or parts of questions are given in brackets []. SECTION A (Attempt all questions) Question 1 A. Name the following [5] (i) Part of the brain associated with memory (ii) The ear ossicle which is attached to the tympanum (iii) Statistical study of human population (iv) The cells in testes that produce male hormones (v) The waxy layer on the epidermis of the leaf meant for reducing transpiration B. State the main function of the following: (i) Cerebrospinal fluid (ii) Eustachian tube (iii) Suspensory ligament (iv) Sperm duct (v) Lenticels [5] C. Rewrite the wrong statement in the correct form by changing only the first and last word. [5] (i) Pregnancy of women can be prevented by the method of Vasectomy. (ii) Cones are the receptors in the retina of the eye sensitive to dim light. (iii) Condoms are physical method of birth control (iv) Lung is protected by the pericardium. (v) The part of the ear associated with balance is the cochlea. Page 1 of 6 D. Give the exact location of the following: (i) Amnion (ii) Pituitary gland (iii) Mitral valve (iv) Organ of Corti (v) Hydathodes [5] E. Give technical terms for the following: (i) The process of WBC squeezing out of capillaries. (ii) The process in which absorption needs metabolic energy. (iii) The stage where chromosomes lie on the equator of the mitotic spindle. (iv) The alternative form of the gene. (v) A fertilized egg. [5] F. Given below are five groups of terms. In each group, arrange and rewrite the terms in the correct order so as to be in in a logical sequence. [5] (i) Spongy cells, Upper epidermis, Stoma, Palisade tissue, Sub-stomatal space (ii) Spinal cord, Motor neuron, Receptor, Effector, Sensory neuron (iii) Endodermis, Cortex, Soil water, Xylem, Root hair (iv) Metaphase, Telophase, Prophase, Anaphase, Cytokinesis (v) Intestine, Liver, Intestinal artery, Hepatic vein, Hepatic portal vein G. Given below are six sets with four terms each. In each set one term is an odd one. Identify the odd term in each set and name the category to which the remaining belongs [5] (i) Cerebrum, cerebellum, thalamus, hypothalamus (ii) Ovary, ureter, fallopian tube, uterus (iii) malleus, pinna, stapes, incus (iv) Pituitary gland, adrenal gland, liver , thyroid gland (v) Haemophilia, albinism, colour blindness, night blindness H. Define the following terms [5] (i) Hormone (ii) Accommodation (iii) Synapse (iv) Reflex action (v) Photophosphorylation SECION B on the next page Page 2 of 6 SECTION B (40 marks) Attempt any FOUR questions from this section Question 2 a. Given below is a diagram showing a defect of the human eye. Study the diagram then answer the questions that follow: [5] 4 1 2 (i) Name the defect shown in the diagram (ii) Name two possible reasons for this defect of the eye in human beings. (iii) Name the parts labelled 1 to 4 (iv) Draw a labelled diagram to show how the eye defect shown can be rectified by using an appropriate lens. 3 b. Answer the following questions. (i) Mention three reasons for increase in population in India. (ii) Write the full form of NADP and BCG (iii) Define the term antibiotics. Give an example (iv) List any two functions of nephrons Question 3 a. The diagram below shows an embryo in the uterus of mammal. [5] [5] H (i) Label the parts A to H as indicated in the diagram. (ii) Name the fetal membranes present in the uterus (iii) Name one important function of part labelled A b. Give a scientific reason for the following. (i) Identical twins usually show similar physical features. (ii) Use of CFCs is banned in most of the countries (iii) Gamete production needs meiotic division (iv) Haemophilia is more common in males than females (v) Stomata are located on the lower surface of leaves Page 3 of 6 [5] Question 4 a. Draw a neat labelled diagram of following. (i) myelinated neuron (ii) a chloroplast [5] b. The following simplified diagram shows the outline plan of circulation in the body of a mammal. [5] (i) Study the diagram and write the name of blood vessels 2 and 8 as mentioned above in the diagram (ii) Several hours after having a meal containing proteins, which blood vessel contain highest concentration of urea? (iii) Which vessel would contain highest concentration of glucose and amino acids after a meal? (iv) Which blood vessel will carry the most oxyhaemoglobin in the blood? Give a reason Question 5 a. The figure below shows an experiment to prove some fact. This set up is kept in sunlight for few hours. Answer the questions based on your observations. [5] (i) Name the physiological process that releases the bubbles you observe in the set up? (ii) Explain the process you mentioned in (i). (iii) Name the colourless gas obtained in the test tube. How the gas can be tested? (iv) Write the complete chemical equation for the process happening in the plant shown in the set up. Page 4 of 6 b. Answer the following questions. [5] (i) Name the endocrine cells present in Pancreas. (ii) Why pancreas is so special gland in our body? (iii) Name one function each for any of the two hormones produced by adrenal cortex (iv) Name the hormone that stimulates entire sympathetic nervous system. (v) Name the nutrient that is responsible for the production of thyroxine. Why the mountain dwellers suffer from the deficiency of nutrient you named in this question. Question 6 a. Study the following experimental set up and answer the questions. [5] (i) Name the apparatus and the physiological process that is tested through this apparatus. (ii) Define the process you mentioned in question (i) (iii) What happens to the air bubble if the apparatus is kept in following conditions? Give a reason for each of them A. Hot dark room B. In front of a fan (iv) State any two limitations of using the apparatus. b. A homozygous plant with yellow seeds in green pods is crossed with homozygous plant with green seeds in yellow pods. [5] (i) Give the genotype and phenotype of plant of F1 generation in this cross (ii) Mention the possible combinations in gametes that can be obtained from the F1 hybrid plant (iii) State the Mendel s law of independent assortment (iv) Mention the different phenotypes of plants that are obtained in F2 generation (v) What is the phenotypic ratio obtained in F2 generation in this cross? Question 7 a. Give reasons for the following statements. [5] (i) When excess soluble fertilizers are added to the soil plants will die (ii) Green leaves are thin and broad (iii) Gametes have haploid number of chromosomes (iv) Injury to medulla oblongata leads to death (vi) It is necessary to check present level of urbanization globally Page 5 of 6 2 1 7 3 b. Diagram on the side shows one of the stage in mitotic division in a cell. [5] (i) Identify the stage. Give a reason (ii) Label the structures 2, 5 and 7. (iii) How many chromosomes are shown in this cell? (iv) Draw a neat labelled diagram of the cell as it would appear in the next stage. Name the stage as well. 6 4 5 Page 6 of 6
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