Formatting page ...
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] 8. A group of chemicals that triggers the falling of leaves and fruits from the plant is called: a) Auxin b) Gibberellins c) Abscisic acid d) Cytokinin 9. What prevents the backflow of blood inside the heart during contraction ? a) Thin wall of atrium b) Thick, muscular wall of ventricle c) Valves present in heart d) All of them 10. A blood vessel leading into the Bowman's capsule is called: a) Afferent arteriole b) Efferent arteriole c) Renal artery d) Renal vein 11. A coiled structure of the human ear which looks like a snail is called. a) Cochlea b) Utriculus c) Ampulla d) Vestibule 12. Which hormone is responsible for ejecting milk from the mammary glands? a) Oestrogen b) FSH c) LH d) Oxytocin 13. Number of chromosomes present in sperm: a) 23 b) 26 c) 23 pairs d) 22 14. Movement of solvent from higher to lower concentration: a) Diffusion b) Osmosis c) Tonicity d) Imbibition 15. Gaseous plant hormone: a) Auxin b) Gibberellins c) Ethylene d) Cytokinin Question.2 i) Name the following- a) b) c) d) e) [5] First discovered plant hormone. The statistical study of human population. Development of fruit without fertilisation. The smallest branch of artery. Stored form of food in animals . ii) Choose the ODD one out of the following terms given and name the CATEGORY to which the others belong. [5] a) Gibberellin, auxin, thyroxin, cytokinin. b) c) d) e) FSH, GH, TSH, thyroxine, LH. Cervix, Fundus, ovary, prostate. PCT, DCT, renal pyramid, loop of henle. Basophils, monocyte, acidophils, neutrophils. iii) Given below are sets of five terms each. Rewrite the terms in correct order in a logical Sequence. [5] a) Nuclear membrane, gene, DNA, nucleoplasm, cytoplasm. b) Vitreous humour, conjunctiva, lens, iris, pupil. c) Ear ossicles, tympanum, oval window, auditory canal,pinna. d) Soil, xylem, epidermis, endodermis, pericycle. e) Ovarian follicle, graafian follicle, ovary, progesteron, corpus luteum. iv) Match the item given below in Column A with the most appropriate terns in Column B and rewrite the correct matching pairs: [5] COLUMN A COLUMN B i) GH a) light sensitive ii) Retina b) Rhodopsin iii) Gibberellin c) Iodopsin iv) Rods d) diapedesis v) Lymphocytes e) Stem elongation f) Blind spot g) Bones v) Mention the exact location of the following: [5] a) Chlorophyll b) Pancreas c) Seminal vesicles d) Lenticle e) Testes SECTION B (40 MARKS) (Attempt any four questions from this section) QUESTION 3 i) Define hormone. ii)Give one difference between cytokinin and ethylene iii) What is Phototropism? Give one example. iv) State Mendel' s Law of dominance. v) Study the given diagram and answer the given questions: (1) (2) (2) (2) (3) a) Label the parts 1 to 3. b) Mention one function of labelled part 2 and 4. c) Identify the diagram shown above. Question.4 i) Expand the abbreviation- MSH. (1) ii) Mention two hormones of female reproductive system. iii) People living in hilly areas generally suffer from goitre. iv) Mention two functions of placenta. v) Study the following diagram and answer the questions that follow. (2) (2) (2) (3) a) State the main function of insulin and glucagon. b) Why Pancreas is refered to as an exo endocrine gland. c) What is the technical term for the cells of Pancreas that produce endocrine hormone. QUESTION 5 i) Define - pulse. ii) What is the significance of hepatic portal vein. iii) State two functions of abscisic acid. iv) Which gland secrets androgen? What is its effect on female body. v) Draw a neat labelled diagram of sperm. QUESTION 6 i) Define - chromosome. ii) Differentiate between endocrine and exocrine gland with reference to secretion. iii) State the function of cerebrum. iv) Colorblindness generally seen in males. Explain. v) Study the diagram given below and answer the following questions that follow- (1) (2) (2) (2) (3) (1) (2) (2) (2) (3) a) Name the labelled part A to D. b) The root hair cell is in a turgid condition, name and explain the process that caused this state. c) Mention one difference between labelled part B and C. QUESTION 7. i) Explain- Accommodation of eye. ii) Give two reasons of myopia. iii) Mention two functions of CSF. iv) What is the difference between rod and cone cells. v) Make a cross between tall dominant plant over a dwarf recessive plant by making a punnett square. Give genotypic and phenotypic ratio of F2 generation. (1) (2) (2) (2) (3) QUESTION 8 i) Define- Mortality. ii) Plant droop on a hot day even though the soil is well watered. Explain. iii) Testes is located out side the male body. Give reason. iv) State two harmful effect of increased population in India. v) Study the diagram given below and answer the following questions given below- a) What is the aim of the experiment. b) Why does plant move towards the light source? c) What is thigmotropism. ************************* (1) (2) (2) (2) [3]
|
