answer key of mock test Science

		398CI7G
		Marking Scheme SUMMATIVE ASSESSMENT – I (2014-15) Science (Class–IX) General Instructions: 1.         The Marking Scheme provides general guidelines to reduce subjectivity and maintain uniformity. The answers given in the marking scheme are the best suggested answers. 2.         Marking be done as per the instructions provided in the marking scheme. (It should not be done according to one’s own interpretation or any other consideration). 3.         Alternative methods be accepted. Proportional marks be awarded. 4.         If a question is attempted twice and the candidate has not crossed any answer, only first attempt be evaluated and ‘EXTRA’ be written with the second attempt. 5.         In case where no answers are given or answers are found wrong in this Marking Scheme, correct answers may be found and used for valuation purpose.
		SECTION-A
	1	Columnar epithelial tissue.	1
	2	Distance	1
	3	Weight of the stone 5 20 N Mass of the stone 5 2 kg	1
	4	(a)        The solvent will evaporate and a residue will be left behind. (b)        (i)         Because it does not have a uniform composition throughout             (ii)        No new compound is formed in a mixture	2
	5	Striated squamous epithelium – arranged in many layers to prevent wear and tear. Squamous epithelium – extremely thin, flat, single layered.	2
	6	According to Newton’s law of Inertia of motion the body remains in motion after applying the brakes. Safety belt helps to keep the grip and body do not get enough jerk and get saved from getting smashed against the windscreen of the car.	2
	7	Property of solid, liquid and gas	3
	8	Explanation of reason : Large latent heat of vaporization of water helps to cool the area.	3
	9	It is the amount of solute present in given amount (mass or volume) of solution or mass or volume of solvent. Ways of expressing concentration : (a)          Mass by Mass percentage 5 (b)          Mass by volume percentage 5	3
	10		3
	11	Refer fig. 6.7, page 73, NCERT Structure-made up of four types of elements : Sieve tubes-tubular cells with perforated walls Phloem parenchyma Phloem fibres-are dead Companion cells Function – transports food from leaves to other parts	3
	12	(a)        0 to 10 sec (b)        Displacement = 125 m, average velocity = 4.17 m/s	3
	13	Yes, value of g50 at centre of earth. G has the same value at the centre of the earth as every where else as it is a universal constant. Weight of object at the centre of the earth is 0.	3
	14	The reason is that the acceleration is inversely proportional to the mass of the body.  The mass of stone being very small as compared to the mass of the  earth the acceleration produced in the stone is large. But the mass of  the earth being very large the acceleration produced in the earth is so small that the earth does not move towards the stone.	3
	15	Meaning of uniform velocity, eg Meaning of variable velocity, eg	3
	16	Acceleration = (v-u)/t M = F/a	3
	17	Expected Answer / Value Points of Test item – 39 (i)         Air, water and soil (ii)        Reproduction, growth, susceptibility to diseases (iii)       Family bonding, applying knowledge	3
	18	One variety can grow in different climatic conditions. Explain	3
	19	(a)        (i)         gas                   (ii)        solid (b)        (i)         258 C              (ii)        278 C              (iii)       78 C	5
	20	Elements                         Cannot be broken down             to simpler substances.             Compounds             Have fixed composition.             Can be broken down into             elements by chemical             reactions. Elements - Iodine, Carbon, 24 Carat gold Compounds - Sodium chloride, water, oxygen gas	5
	21	(a)        (i)         in such habitat, protection against water loss is essential             (ii)        protection against water loss, mechanical injury (b)        Cells are elongated, flattened             Closely packed. No intercellular spaces and form a continuous layer	5
	22	(a)          2gh5v22u2                 23103h5022(20)2                 h520m                 Displacement 50                 Total distance 52320540 m (b)          G5 constant value, G56.7310211 Nm2kg22                         g 5 changes from place to place, g on earth59.8 ms22	5
	23	(a)        A (b)        B (c)        A (d)       B (e)        B	5
	24	Criteria of crop selection are             (i)         different nutrient requirement.             (ii)        availability of moisture and irrigation facility                         Advantages of intercropping                         Advantages of crop rotation	5
		/SECTION - B
	25	(c)        Iodine solution	1
	26	(c)        Potato	1
	27	(c)	1
	28	(d)	1
	29	(a)	1
	30	(c)	1
	31	(c)	1
	32	(a)        sugar	1
	33	(a)	1
	34	Thin paste of starch is added to hot water with constant stirring.	2
	35	Melting point of ice 00C           273K Boiling point of water 1000C   373 K	2
	36	Mass of dry raisins (w1)         = 3g Mass of soaked raisins (w2)   = 4.8g Mass of water absorbed = 4.8-3 = 1.8g x100 % of water absorbed = w2-w1                                           w1 x100                                     = 1.8                                       3                                    = 60%	2