MAHESH TUTORIALS SECTION - A

Size: px

Start display at page:

Download "MAHESH TUTORIALS SECTION - A"

Lesley Tucker
5 years ago
Views:

1 S.S.C. MAHESH TUTORIALS Test - II Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. 5 min. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : A lens does not produce any deviation of a ray of light passing through its.... (a) centre of curvature (b) optical centre (c) second focal point (d) axial point at a distance of F The image of an object is formed behind... in hypermetropia. (a) cornea (b) retina (c) lens (d) iris Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II Myopia (a) Convex lens Hypermetropia (b) Concave lens (iii) Presbyopia (c) Cone cells (iv) Colour blindness (d) Ciliary muscles (e) Bifocal glasses Q.I (C) State whether the following statements are True or False : Convex lens is called a diverging lens. Bordering the zig-zag line are elements called as metalloids. Q.II Answer the following as required : (Any Two) Distinguish between Myopia and Hypermetropia. Write the correlated terms :. Alkali metals : Monovalent :: Alkaline earth metal :..... Tellurium :... :: Radium : Metal. (iv) The family of noble gases is called as zero group. Why? Q.III Solve the following : The power of a convex lens is dioptres. Find its focal length. 4 Q.IV Draw a neat and labelled diagram : (Any One) A ray diagram for object position at F for a convex lens. A ray diagram for object position at F for a convex lens.

2 S.S.C. MAHESH TUTORIALS Test - II Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. 5 min. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : A lens does not produce any deviation of a ray of light passing through its optical centre. The image of an object is formed behind retina in hypermetropia. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II Myopia Concave lens Hypermetropia Convex lens (iii) Presbyopia Ciliary muscles (iv) Colour blindness Cone cells A.I (C) State whether the following statements are True or False : False. Convex lens is called a converging lens. True. A.II Answer the following as required : (Any Two) Myopia and Hypermetropia. Myopia. It is defect in which a human eye can see nearby objects clearly but is unable to see distant objects clearly.. In myopia, the image of the distant object is formed in front of retina.. The distance between eye lens and retina increases as eyeball is lengthened or lens is curved. 4. It is corrected by using concave lens of suitable focal length. Hypermetropia. It is the defect in which human eye can see distant objects clearly but is unable to see nearby objects clearly.. In hypermetropia, the image of nearby object falls behind the retina.. The distance between eye lens and retina decreases on account of either shortening of eyeball or flattening of lens. 4. It is corrected by using convex lens of suitable focal length.

3 A ray diagram for object position at F for a convex lens. A B F F O F F Image position : At infinity. Nature : Real, inverted and highly magnified. A.V Answer the following : (Any One). The ability of the lens of adjusting focal length is known as power of accommodation.. The process of focusing the eye at different distances is called accommodation.. This is brought about by a change in curvature of the elastic lens making it thinner or fatter. Metals : Lithium, Beryllium, Sodium, Magnesium, Aluminium, Potassium, Calcium. Non-metals : Hydrogen, Helium (zero group), Carbon, Nitrogen, Oxygen, Fluorine, Neon(zero group), Phosphorus, Sulphur, Chlorine, Argon (Zero group). Metalloids : Boron, Silicon. SECTION - B A.I Fill in the blanks : Products are represented on right hand side. When oil and fats are oxidized or even allowed to stand for a long time, they become rancid. (iii) The digested food is absorbed by the villi in the small intestine. (iv) Pulmonary artery takes the blood to the lungs for oxygenation. A.II (A) Give scientific reasons : (Any One). Mammals have high energy requirement for maintaining their body temperature.. For obtaining this energy, oxygen rich blood has to reach the cells.

... 5.... The walls of the large intestine have villi which absorb most of the water and salts. 4. The rest of the material is removed from the body through the anus.

4 The walls of the large intestine have villi which absorb most of the water and salts. 4. The rest of the material is removed from the body through the anus. Here, the exit is regulated by the muscle called sphincter. (v) Budding : Parent cell Bud Daughter cells A.III. Yeast reproduce by budding in which a small outgrowth is formed on the parental cell.. The nucleus of the parental cell divides and one daughter nucleus migrates into the bud.. The bud increases in size, separates and grows further. Draw a neat and labelled diagram of the following: (Any One) Vertical section of the human heart. From upper part of the body To body To body From lungs To lungs From lungs Aorta Superior vena cava Left atrium Right atrium Left ventricle Interior vena cava Right ventricle From lower part of the body

5 This process takes place in the mitochondria of the cells and involves a series of biochemical reactions.. The process of cellular respiration varies greatly in different organisms yet the first step is common in all. The six carbon molecule glucose (C 6 H O 6 ) is broken down in the cytoplasm into a three carbon molecule called pyruvate. This processs is anaerobic and is called glycolysis. Glycolysis in the Glucose cytoplasm (6 carbon (no oxygen is required) Pyruvate (a three carbon In absence of oxygen (fermentation) Eg. in yeast In lack of oxygen Eg. in human muscle cells In presence of oxygen Eg. in mitochondria Ethanol + carbon dioxide + energy (-Carbon (ATP) Lactic acid + energy (ATP) (-Carbon Carbon dioxide + water + energy (-Carbon (8ATP) (Break down of glucose by various pathways) 4. The energy released during cellular respiration is used to synthesize ATP which is used to fuel all other activities in the cell. 5. The energy released during aerobic respiration is more than the energy released during anaerobic respiration.. The muscles of the atria are relaxed.. The right atrium receives deoxygenated blood collected from different organs of the body via large veins called venacava. The left atrium receives oxygen rich blood from the lungs simultaneously through the four pulmonary veins.. The atria contract and pour the blood into respective ventricles which expand to receive the blood. Left ventricle gets filled with oxygenated blood and right ventricle gets filled with deoxygenated blood.

Monday, ! Today: Respiratory system! 5/20/14! Transport of Blood! What we ve been covering! Circulatory system! Parts of blood! Heart! tubing!

Monday, ! Today: Respiratory system! 5/20/14! Transport of Blood! What we ve been covering! Circulatory system! Parts of blood! Heart! tubing! Monday, 5.19.14! What we ve been covering! Circulatory system! Parts of blood! Heart! tubing! Transport of Blood! What is transported! Nutrients! Oxygen! Carbon Dioxide! Hormones! Antibodies! What it is/does!