Roman Saini is teaching live on Unacademy Plus
Q301. Consider the following: 1. Photosynthesis is a biological change. 2. Green plants absorb light energy using chlorophyll in their leaves. 3. Chlorophyll absorbs the light energy to make foods. Select the correct answer using the code given below A. B. C. D. 1 and 2 only 2 and 3 only All of the above None of the above
Solution: B Photosynthesis is the chemical change which happens in the leaves of green plants.
Q302. Which of the following is/are the limiting factors in Photosynthesis? 1. Light intensity 2. Temperature 3. Air Humidity 4. Carbon dioxide concentration Select the correct answer using the code given below: A. 1, 2 and 3 only B. 1, 2 and 4 only C. 1, 3 and 4 only D. 2, 3 and 4 only
Solution: B without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Decreasing the light intensity will slow the speed of photosynthesis. Even if, there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide. do Air humidity is not a limiting factor because plant takes water from the roots. So statement 3 is not valid Olf it gets too cold, the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot. Hence B is the right option.
Q303. Consider the following about 'Greenhouse farming': 1. Greenhouse, farming is a technique of farming to increase agricultural productivity by 2. preventing the affect of greenhouse gases on the crops. Through the greenhouse farming techniques, the negative effect of light, carbon dioxide and temperature can be minimised to achieve optimal productivity. 3. In greenhouses the process of photosynthesis can continue in night also. 4. The use of paraffin lamps inside a greenhouse increases the rate of photosynthesis. Select the correct answer using the code given below: A. All of the above B. 2, 3 and 4 C. 3 and 4 D. 1 and 2 only
Solution: B The Basic purpose of greenhouse farming is to increase the agricultural productivity specially in such places where, Light intensity is either too low or too high Temperature is either too low or too high. So Statement 1 is wrong. A greenhouse (also called a glasshouse or hothouse) is a building where plants such as flowers and vegetables are grown. The use of paraffin lamps inside a greenhouse increases the rate of photosynthesis because the burning of paraffin produces carbon dioxide and heat.
Q304. Consider the following: 1. Leaves are the food making factories of the plants. 2. The part of a leaf by which it is attached to the stem is called petiole. 3. Leaf venation is the pattern of leaf veins. 4. Plants release a lot of water in air through vaporisation. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 2, 3 and 4 only C. 1, 3 and 4 only D. All of the above
Solution: A Water comes out of leaves in the form of vapour by a process called transpiration. Plants release a lot of water into the air through this process. the alir through this proceys roce alld transpiration. Plants
Q305. Match the following Joints with their respective body parts: Joints a) Pivotal joint b) Ball and socket joint c) Hinge d) Fixed Select the correct answer using the code given below: Body Part 1. Hip 2. Finger 3. Neck 4. Upper jaw a) b) c) d) A. 1 2 3 4 C.
Solution: D Pivotal joint Ball and socket joint Hinge Fixed 3. Neck 1. Hip 2. Finger 4. Upper Jaw
Q306. Consider the following about Transpiration: 1. It is a physical process and occurs in plants. 2. Only living cells are involved in it. 3. The water moves through epidermis with its cuticle or through the stomata. Select the correct answer using the code given below A. B. C. D. 1 and 2 only 1 and 3 only 2 and 3 only All of the above
Solution: C Transpiration is a physiological process.
Solution: C Solution: Neither stomata nor epidermis is involved.
Q309. Consider the following about joints 1. Saddle joint is the poorly developed ball and socket joint. Saddle joint is the poorly developed ball and In the old age, loss of calcium from the bones decreases the strength of bone tissues. This disease is known as osteoporosis. 2. 3. Wrist bones have saddle joints. 4. Sutures have no joint cavity. Select the correct answer using the code given below: A. 1, 2 and 3 only B. 2, 3 and 4 only C. 1, 2 and 4 only D. All of the above
Solution: C Self explanatory
Q311. Lipids are important constituents of? A. Nucleus B. Biological membranes C. Ribosome D. Both A and B
Solution: B Self explanatory
Q313. Consider the following Statements: 313.Consider the foll 1. Moon is a non-luminous object. 2. Butter paper is a translucent object. Select the correct answer using the code given below: A. 1 only B. 2 only C. Both 1 and 2 D. Neither 1 nor 2
Q314. Consider the following statements: Assertion (A): Unpolished rice should be eaten. Reason R): Polished rice lacks Vitamin B. Select the correct answer using the code given below: 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 but R is false. D. A is false but R is true. E. Both A and R are false. Reason (R): Polished rice lacks Vitamin B.
Q315. Consider the following Statements: 315.Consider the foll 1. Magnetite is a natural magnet. 2. A Greek shepherd discovered the first magnet. 3. Magnetism is a natural property and it won't lost on heating the magnet. Select the correct answer using the code given below A. 1, 2 and 3 only B. 1 and 2 only C. 1 and 3 only D. 2 and 3 only
Solution: B A Greek shepherd named Magnes discovered magnets 4,000 years ago in Magnesia, Greece. Magnets loose their properties if they are heated, hammered or dropped from some height So the statement 3 is wrong. Hence B is the right option.
Q316. Consider the following statements 1. Manometer is a device for measuring differences in pressure usually by noting the differences in the height of two liquid columns. 2. Sphygmomanometer is a device used to measure blood pressure. Select the correct answer using the code given below: A. Both 1 and 2 are correct B. Both 1 and 2 are incorrect C. Only 2 is correct D. Only 1 is correct
Solution: A Manometers are devices in which columns of a suitable liquid are used to measure the difference in pressure between two points or between a certain point and the atmosphere
0318. Match the following List -I List-ll a) Entomology b) Cytology c) Anthology d) Acariology Select the correct answer using the code given below: 1. Study of flowers 2. Study of ticks and Mites 3. Study of cells and its organelles 4. Study of insects a) b) c) d) A. B. C. D. 2 3 4 1 4 3 1 2 1 3 4 2
Solution: C Isogonic line. : An imaginary line or a line on a map joining points on the earth's surface at which the magnetic declination from the true north position is the same Agonic Lines: Lines along which the magnetic declination is zero are called agonic lines. Aclinic Lines: An imaginary line on the earth's surface roughly parallel to the geographical equator and passing through those points where a magnetic needle, if suspended freely has no dip or inclination. It is also called as magnetic equator. lsoclinic lines: A line on a map connecting points of equal dips in the earth's magnetic field
Q321. Consider the following statements 1. Paramagnetic substances contain equal number of electrons spinning in opposite directions. 2. The magnetic field inside the di-magnetic substances will weaken if external magnetic field applied on such substances. Select the correct answer using the code given below: A. Both 1 and 2 are correct B. Both 1 and 2are incorrect C. Only 1 is correct D. Only 2 is correct
Solution: D Di-magnetic not Paramagnetic substances contain equal number of electrons spinning in opposite direction:s
Q324. Consider the following statements about parts of the flower: 1. A typical flower has four parts sepals, petals, stamens, and pistils 2. Sepals is the outermost part of the flower, seen at the base of the flower and holds the petals together. 3. Pistil have two parts - Ovary and Ovules. 4. Not all flowers have sepals, petals, stamens and pistils. Select the correct answer using the code given below: A. 1, 2 and 4 only B. 2 and 3 only C. 1 only D. All of the above
Solution: A The spinal cord is a bundle of nerves that go to and from the brain. It is enclosed in and protected by the bony vertebral column. The main function of the spinal cord is transmission of neural inputs between the periphery and the brain
Q328. Why the tail of a comet always points away from the sun: A. Due to centrifugal force B. Due to centripetal force C. Due to force of repulsion exerted by the sun D. Due to solar radiation and solar wind
Solution: B Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling. Olt is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air (which is 332 m/s or 1195 km/hr or 717 miles/hour.)