Writing Time: 2 hours Full mark: [100] READ THE FOLLOWING DIRECTIONS CAREFULLY

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MOTITHANG HIGHER SECONDARY SCHOOL THIMPHU THROMDE Every child is inspired to learn and be empowered with wisdom to excel in life MID TERM EXAMINATION- 2018 Science Paper 3 (Biology) Class: IX Name:

This time is to be spent reading the questions. After having read the questions, you will be given one and half hours to answer all questions. 2. In this paper, there are two sections: A and B.

1 MOTITHANG HIGHER SECONDARY SCHOOL THIMPHU THROMDE Every child is inspired to learn and be empowered with wisdom to excel in life MID TERM EXAMINATION Science Paper 3 (Biology) Class: IX Name: Class/Section: Roll No: Reading Time: 15 mins Writing Time: 2 hours Full mark: [100] Mark obtained: READ THE FOLLOWING DIRECTIONS CAREFULLY 1. Do not write for the first fifteen minutes. This time is to be spent reading the questions. After having read the questions, you will be given one and half hours to answer all questions. 2. In this paper, there are two sections: A and B. Section A is compulsory. You are expected to attempt any FIVE questions from section B. Extra attempt will be punished. 3. The intended marks for questions or parts of questions, are given in brackets [ ]. 4. Read the directions to each question carefully and write all your answers in the space provided in the question booklet itself. Section A (50 Marks) Compulsory: Attempt all questions. Question I A. For each question, there are four alternatives A, B, C and D. Choose the correct alternative and write it in your answer sheet. Do not write more than ONE alternative. If there is more than one choice written, no score will be awarded. [25] 1. The microscope consists of two lenses or more and uses a beam of light. Its magnification power is 1000 times. Identify the microscope that best fits the description mentioned above isa. simple microscope. c. polarized microscope. b. electron microscope. d. compound microscope. 2. The scientist who first discovered cell in a dead wooden cork and named it as cell - a. Robert Hooke c. Matthias Schleiden b. Rudolf Virchow d. Antony Van Leeuwenhoek 3. The cell organelle which is mostly rod-shaped and has double membrane, inner membrane thrown into cristae isa. Lysosome b. Mitochondria c. Golgi Apparatus d. Endoplasmic Reticulum MHSS/MT/BIO/IX/2018 Page 1 of 8

4. The Plastid that is found in the cells that are not exposed to sunlight and are colourless isa. Carotene. c. Leucoplast. b. Chloroplast. d. Xanthophyll 5.

Reproduction in the living organism is through the activity of sperm and ovum b. The cell is the structural unit of all living beings. c. All cells arise from the pre-existing cell. d.

2 4. The Plastid that is found in the cells that are not exposed to sunlight and are colourless isa. Carotene. c. Leucoplast. b. Chloroplast. d. Xanthophyll 5. The function of an organism as whole is the outcome of the combined activities of the cells. The answer that supports the above statement isa. Reproduction in the living organism is through the activity of sperm and ovum b. The cell is the structural unit of all living beings. c. All cells arise from the pre-existing cell. d. The cell has a heredity unit called genes. 6. In the diagram of a cell, the structure that performs the function similar to the function of the human brain is a. 1 c. 3 b. 2 d Transpiration occurs at a faster rate when the day is a. hot, humid and windy. c. hot, dry and windy. b. hot, humid and still air. d. Hot, dry and still air 8. The diagram below represents a change in guard cells that open and close pores in a plant. This change directly helps toa. regulate gaseous c. regulate water loss. exchange. d. absorb mineral b. reduce glucose production. 9. During photosynthesis in plants, the source of the carbon in the sugar molecule (C 6 H 12 O 6 ) isa. Carbon dioxide in the air. b. Carbon mono oxide in the air. c. Carbon particles in the soil. d. Carbon particles in the water. 10. The way in which photosynthesis and cellular respiration is similar isa. both require sunlight. b. both occur in chloroplast. c. both involve organic and inorganic molecules. d. both require oxygen and produce carbon dioxide. 11. The fine respiratory openings found on the stems of woody plants isa. stomata. b. lenticels. c. cuticles. d. Thylakoids 12. A special paper used to show the loss of water through stoma of a leaf during experiment on transpiration is - a. filter paper. b. litmus paper. c. PH indicator. d. cobalt chloride 13. During light phase of photosynthesis water is oxidized and.. is reduced. a. Oxygen b. Glucose c. Hydroxyl d. Carbon dioxide 14. Leaves are reduced to spines in xerophytic plants in order to- MHSS/MT/BIO/IX/2018 Page 2 of 8

3 a. increase the rate of transpiration. c. escape from sunlight. b. decrease the rate of transpiration. d. stop photosynthesis. 15. A glass slide is placed over the dry cobalt chloride paper in the experiment to investigate transpiration toa. see the colour changes in cobalt chloride paper since it is transparent. b. prevent cobalt chloride papers contacting atmospheric humidity. c. easy to attach cobalt chloride paper on the leaf. d. it helps more transpiration to take place. 16. The colour of cobalt chloride paper before the experiment is a. red. c. blue. b. pink. d. green. 17. The biological process which is represented in the form of equation is completed in Carbodioxide + water glucose + water + oxygen a. mitochondria c. ribosome b. cell membrane d. Chloroplast. 18. If human dental formula is , the 1 in the formula stands fora. Molar c. Incisor b. Canine d. premolar 19. The organ that does not produce digestive juice isa. Liver c. Stomach b. Kidneys d. pancreas 20. The process of removing indigestible substances from the body is calleda. Excretion c. Defecation b. Secretion d. Digestion 21. The walls of the stomach secrets an acid that protects the body by destroying germs, worms and any harmful bacteria present in our food. The acid secreted isa. hydrochloric acid. c. carbonic acid. b. sulphuric acid. d. nitric acid 22. Blood of all vertebrates is red in color due to presence of a. melanin c. Hemoglobin. b. chlorophyll d. Carotene. 23. The valve present between the RA and RV is a. tricuspid valve. b. bicuspid valve. 24. The main function of lymph nodes is to a. produce enzymes. b. produce leucocytes. c. aortic semi lunar valve d. pulmonary semi lunar valve c. digest old erythrocytes. d. destroy diseases causing germs. MHSS/MT/BIO/IX/2018 Page 3 of 8

4 25. The blood circulation in which the blood comes out from an organ and re-enters an organ is known asa. Systemic circulation. c. Pulmonary circulation. b. Lymphatic circulation d. Hepatic portal circulation. B. Fill in the blanks by writing suitable word/s. [5] 1. The membrane around the vacuoles is called 2. In most algae, certain fungi and higher green plants, main component of cell wall is 3. The infolding of the inner membrane of mitochondria is termed as 4. In green plants, the organelle responsible for photosynthesis is 5. Chemically, cell wall is made up of cellulose and the cell membrane is made up of C. State whether the following statements are TRUE or FALSE. Re-write the FALSE statement by changing the word/s underlined in the answer script. [5] 1. Leaves are reduced to spines in Xerophytic plants. 2. Guttation is the loss of water from a cut stem. 3. The plastid that is present in mari gold flower is Xanthophyll. 4. Auxin induces ripening of fruits. 5. Contraction of short segments of small intestine is called segmentation. D. Match the item in column A with the most appropriate item in column B. Rewrite the correct matching pairs in column C. [6] Column A Column B Column C(Answer) 1 The part of digestive system where absorption A Genes of food takes place 2 Special pore bearing structure in the leaf margin B cytosol through which transpiration takes place. 3 The heredity unit of the cell. C Stomata 4 The opening in the leaves through which gaseous exchange takes place. D Large intestine 5 The liquid part of the cell excluding the E Small organelles. 6 The part of digestive system where absorption of water takes place intestine F Hydathodes G Vacuole MHSS/MT/BIO/IX/2018 Page 4 of 8

E. Choose the ODD one out from the following sets and give reason for your choice. [4] 1. Lysosome, ribosome, centrosome, cell wall. 2. Canines, incisors, heterodont, premolars. 3.

The part of the cell which supports the chromatin materials and provides rigidity to the nucleus. 2. The process of absorption of mineral salts against the concentration gradient by simple diffusion.

Small finger like projections found inside small intestine. Question 2 Section B (50 marks) Attempt only FIVE Questions a) The diagram given shows two cells X and Y.

5 E. Choose the ODD one out from the following sets and give reason for your choice. [4] 1. Lysosome, ribosome, centrosome, cell wall. 2. Canines, incisors, heterodont, premolars. 3. Ion-exchange theory, physical force theory, cohesion-tension theory, root pressure theory. 4. Duodenum, jejunum, caecum, ileum. F. Name the following [5] 1. The part of the cell which supports the chromatin materials and provides rigidity to the nucleus. 2. The process of absorption of mineral salts against the concentration gradient by simple diffusion. 3. The cell organelle in the animal cell which initiates and regulates cell division. 4. A substance used to prevent excessive transpiration in plants during drought. 5. Small finger like projections found inside small intestine. Question 2 Section B (50 marks) Attempt only FIVE Questions a) The diagram given shows two cells X and Y. Observe and answer the questions that follows- i) Identify cell X and cell Y. [1] ii) Label parts A,B & C. [1] iii) Give two differences between cell X and Cell Y [1] iv). Name types of plastid. Write function of each. [2] [2] b) The structure given is from green plants. Study it to answer the questions i. Name the structure [ 1] ii. Label the parts 1, 2, 3, 4,5 and 6 [3] iii. Where is the pigment chlorophyll located in the above structure? [1] MHSS/MT/BIO/IX/2018 Page 5 of 8

Question 3 a) The diagram given below shows the human circulatory system. Study the same and answer the following questions. i. Name the organ A,B and C. [1 ½ ] ii.

6 Question 3 a) The diagram given below shows the human circulatory system. Study the same and answer the following questions. i. Name the organ A,B and C. [1 ½ ] ii. Name the blood vessels 1, 2 and 3 [1 ½ ] iii. Define double circulation. [1] iv. What is function of valve? Name the valves found in our heart [3] b) Complete the table [3] Sl no Digestive accessory organs Functions 1 Pancreas 2 Liver 3 Gall Bladder Question 4 a) Tabulate the characteristics and functions of the following given plant hormones. You may write only one characteristic and function for each hormones. [4] (Auxin, Cytokinins, Gibberellins, Abscisic acid) Sl.No Plant Hormones Characteristic Function 1 Auxin 2 Cytokinins 3 Gibberellins 4 Abscisic Acid b). Study the figure below to answer the question i) to ii) i) Name the organ system [1] ii) Label the parts 1,4,5 and 6 [2] c) Write the function of the following [3] i. Heart ii. Bicuspid iii. Coronary artery MHSS/MT/BIO/IX/2018 Page 6 of 8

7 Question 5 a) Complete the table given below by using appropriate word/words. [3] Part of the cell Characteristic Function Cell membrane Mitochondria Endoplasmic Reticulum b) The diagrams given below are cross sections of blood vessels. i) Identify the blood vessels A and B. [1 ] ii) Name the parts labeled 1 to 3. [1 ½] iii) Mention one structural difference between A and B. [1] iv) Name the type of the blood that flow through blood vessel A. [1/2] c) The rate of photosynthesis depends on external and internal factors, so list down any three external and internal factors each. [3] Question 6 a) Diagram given is a human cell. i) Identify the human cell [1] ii) Label the parts 1, 2, 3, 4, [2] iii) What is the role played by the above cell in fertilization? [1] b) Give reasons for the following statements [3] i. Robert Hooke discovered cell wall but not cell organelles ii. People living in the high altitude have more numbers of red blood cells. iii. More transpiration takes place from the lower surface of the leaf. c) Answer the following questions based on transpiration. i. Name the three kinds of transpiration. [1] ii. Compare and contrast between the three types of transpiration by giving at least two differences. [2] MHSS/MT/BIO/IX/2018 Page 7 of 8

Question 7 a) Differentiate between the following pairs of words by giving at least two differences. [3] 1. Light reaction and Dark reaction. 2. Transpiration and Evaporation. 3.

8 Question 7 a) Differentiate between the following pairs of words by giving at least two differences. [3] 1. Light reaction and Dark reaction. 2. Transpiration and Evaporation. 3. Hepatic circulation and pulmonary circulation. b) Define the following terms. [4] 1. Photosynthesis. 2. Peristalsis 3. Digestion 4. Circulation c) A student set up an experiment as shown below to test a factor for photosynthesis. i) What can you conclude from the experiment? [1] ii) Which leaf of the plant acts as a control for the experiment? [1] iii) During the day, transpiration and photosynthesis are interlinked. Explain briefly [1] MHSS/MT/BIO/IX/2018 Page 8 of 8

Discovery of the Cell

Cell Structure Discovery of the Cell Who discovered cells? 1665 Robert Hooke used a compound microscope to examine a piece of cork (20X magnification) He saw little boxes in the cork and called them cells