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ICSE Class X Prelims 2024 : Biology (GEMS Modern Academy, Dubai)

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PRELIMINARY EXAMINATION - 2024 BIOLOGY GRADE: 10 TIME: 2 HOURS DATE: 15/01/24 MAX. MARKS: 80 ____________________________________________________________________________ INSTRUCTIONS [The time stated above is the time allowed for writing the examination. In addition, the first 15 minutes will be the time given for reading the question paper] This question paper is divided into two sections. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets []. ____________________________________________________________________________ SECTION A (40 MARKS) (Answer all questions in this section) Question 1 Select the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only: (i) What are the chances of having a female child in a family? (a) 25% (b) 50% (c) 75% (d) 100% (ii) The unit of inheritance that contains the information to express a trait. (a) DNA (b) Gene (c) Histones (d) Chromosome Page 1 of 10 [15] (iii) In a "fight or flight" response, which division of the autonomic nervous system is primarily activated? (a) Parasympathetic (b) Sympathetic (c) Somatic (d) Central (iv) Phase in which cleavage furrow deepens: (a) Anaphase (b) Telophase (c) Metaphase (d) Prophase (v) The nephrons discharge their urine at the: (a) Urinary bladder (b) Urethra (c ) Renal pelvis (c) Renal pyramid (vi) When red blood cells are placed in _____________, the water travels into the cells via osmosis causing the cells to ___________. (a) Hypertonic solution, swell. (b) hypotonic solution, swell. (c) isotonic solution, shrink (d) Hypotonic solution, shrink (vii) Light reaction: Granum Dark reaction: ____________ (a) Stroma (b) Thylakoid (c) Grana (d) Mesophyll cells Page 2 of 10 (viii) The hormone that triggers the fall of mature leaves and fruits from plants is: (a) Auxin (b) Gibberellin (c) Abscisic acid (d) Cytokinin (ix) The blood cells which are involved in inflammatory reactions: (a) Neutrophils (b) Eosinophils (c ) Basophils (d) Lymphocytes . (x) Assertion(A): In photosynthesis oxygen evolved comes from water. Reason (R): The evolution of oxygen and reduction of carbon-dioxide during Photosynthesis takes place due to photolysis of water. (a) Both A and R are True, and R is the correct explanation of A (b) Both A and R are True, but R is not the correct explanation of A (c) A is True and R is False (d) A is False and R is True. (xi) In a situation where there is an obstruction in a coronary artery, what potential outcome can be anticipated? (a) Increased blood flow to the heart (b) Decreased blood flows to the heart. (c) Decreased blood flow to the kidney. (d) Decreased blood flow to the lungs. (xii) The ciliary apparatus is the eye is an extension of the. (a) Sclera (b) Choroid (c) Retina (d) Iris Page 3 of 10 (xiii) In a DNA sequence consisting of 200 nitrogenous base pairs, with 50 being Thymine, what is the count of Cytosine bases within this sequence? (a) 50 (b) 200 (c ) 100 (e) 25 (xiv) Pituitary gland regulates the urine formation through. ( a) Oxygen (b) TSH (c) ACTH (d) ADH (xv). Which of the following is not a natural reflex action? (a) Knee-jerk (b) Blinking of eyes due to strong light (c) Salivation at the sight of food (d) Sneezing when any irritant enters the nose. Question 2 (i) Give the biological term for the following: [5] (a) The gland that releases Oxytocin in the blood stream. (b) The process of transformation of several glucose molecules into one molecule of starch. (c) A neurotransmitter stored at the terminal end of the axon. (d) The respiratory pigment in Erythrocytes. (e) The layer of the eyeball that provides nourishment to the eye. (ii) State the differences between the following: (a) Vasectomy and Tubectomy (process). (b) Menarche and Menopause (define). (c) Karyokinesis and cytokinesis (process). Page 4 of 10 [5] (d) Thigmotropism and geotropism (stimulus involved) (e) Pulmonary circulation and systematic circulation (pathway) (iii) State the location of the following structure: [5] (a) SAN (b) Hydathode (c) lenticels (d) Tricuspid valve(e) Glomerulus (vi). Given below is an example of a particular structure and its special functional activity, e.g. Glomerulus and ultrafiltration. On a similar pattern, complete the following: [5] (a) Organ of corti and ______. (b) Iris of the eye and ______. (c) Semicircular canals and ______. (d) Seminiferous tubules and ______. (e) Eustachian tube and ______. (v). State whether the following statements are True or False. If False, rewrite the correct form of the statement by only changing the last underlined word of the statement. [5] (a) The alpha cells of the pancreas secrete insulin. (b) Duplicated chromosomes remain attached at a point termed centrosome. (c) The number of pairs of autosomes in man is 22. (d) Ganglion is the point of contact between the axon endings of one neuron with the dendrite of another neuron. (e) Plants which manufacture their own food are termed heterotrophs. Page 5 of 10 SECTION B (40 MARKS) (Answer Any FOUR questions in this section) Question 3 (i) (ii) Justify giving reason-Vermiform appendix is functional in ruminant animals but has become vestigial in human. [1] Find the odd one out: [2] a. Chicken pox, Color blindness, Hemophilia, Albinism. b. Pulmonary artery, hepatic artery, renal artery, coronary artery (iii) Expand the following term [2] a. TSH b. IAA (iv) What is CFC? Why was it banned in most countries? (v) The diagram given below represents the longitudinal section of a testis of man. Study it carefully and answer the following questions. [2] [3] a. Identify and name the site of sperm maturation. b. Why is the structure shown above placed outside the abdomen in man? c. Name the cells that secrete Testosterone. Page 6 of 10 Question 4 (i) State a specific feature seen in a man suffering from Acromegaly ? [1] (ii) Give scientific reason: [2] (iii) a. In some xerophytes leaf are modified into spines. b. Carbon monoxide is dangerous when inhaled. State the difference between corpus callosum and corpus luteum (location and function). (vi) [2] Study the following experimental set -up of a particular tropic movement in germinating seeds and answer the following questions. [2] a. Name the tropic movement shown by part 1. b. Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? (v) Draw and label a neat diagram of the longitudinal section of the kidney. [3] Question 5 (i) Homo sapiens sapiens is the most highly evolved form of man-Give biological reason. [1] (ii) State Mendel s Law of Dominance. [2] (iii) Rewrite and complete the second pair on the similar basis: [2] a. Foetus: Amnion:: Heart:__________. b. Lub: AV valves: : Dub: _____________. (v) Mention two characteristics features of Neanderthal man. Page 7 of 10 [2] (vi) The diagram given below shows a certain phenomenon. Study it and answer the questions. [3] a. Name the phenomenon and in which type of cell division does this occur. b. Label the structure marked 1 and 2. c. What is the significance of this phenomenon? Question 6 (i) What is Pulse? [1] (ii) Mention two significant features of the stage Prophase during Mitosis. [2] (iii) Describe S-phase in cell cycle. [2] (iv) A homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a). [2] a. What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers? b. Draw a Punnett square board to show the gametes and off springs when both the parent plants are heterozygous for axial flowers. What is the Phenotypic ratio and genotypic ratio of the cross shown? (v) Draw a neat, labelled diagram of an open stomatal apparatus. Page 8 of 10 [3] Question 7 (i) Give the significance of fallopian tube. [1] (ii) Explain Industrial melanism . [2] (iii) State the significance of Active transport and diffusion in plants [2] (iv) Light phase of photosynthesis is called Photochemical phase-justify [2] (v) Study the picture given below and answer the questions that follow. [3] a. Name the category of waste that is being disposed. b. Give an example of such a waste. c. Are they hazardous to humans and animals? Give a suitable reason to justify your answer. Question 8 (i) Explain why Pituitary gland is called the master gland. [1] (ii) How do the rod sensory cells of the eye adapt in dark and in light? [2] (iii) State the difference between the followings: [2] a. Demography and population density (definition) b. Renal cortex and renal medulla (parts of the nephrons present). (iv) Mention the function of hypothalamus and medulla oblongata. Page 9 of 10 [2] (v) The diagram given represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow. [3] a. What is the state of the cell shown in the diagram? b. Label the parts 1 to 4. c. How can the above cell be brought back to its original condition? Mention the scientific term for the recovery of the cell. ---------------------------------------------------------------------------------------------------------- Page 10 of 10

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