Lesson - 6 : Life Processes MCQs for Class-10 Biology

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MCQs for Class-X Biology

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1) Most of the food on earth is :

a) Oxygen based

b) Nitrogen based

c) Carbon based

d) Hydrogen based

c) Carbon based ( Pg. no.: )

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2) Use of stored energy for life process takes place during :
a) Sleep

b) Walking

c) Playing

d) All of the above

d) All of the above ( Pg. no.: )

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3) Life process is important throughout the life of a person because :
a) Life process like respiration must continue even during sleep

b) It need not continue during sleep

c) It helps in maintaing life

d) Both A & C

d) Both A & C ( Pg. no.: )

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4) Multi - Cellular organisms cannot depend on diffusion because :
a) Not all cells are in contact with the outer surface

b) Diffusion cannot occur in multi - cellular organism

c) Their body design is simple

d) All of the above

a)Not all cells are in contact with the outer surface ( Pg. no.: )

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5) The most common chemical means to break down molecules is :
a) Combustion reaction

b) Redox reaction

c) Neutralisation

d) Electrolysis

b) Redox reaction ( Pg. no.: )

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6) What is the other name of enzymes?
a) Bio-Catalysts

b) Physical Catalysts

c) Chemical Catalysts

d) All of the above

a)Bio-Catalysts ( Pg. no.: )

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7) The survival of heterotrophs depends __________ on autotrophs
a) Directly

b) Indirectly

c) Both

d) None of the above

c) Both ( Pg. no.: )

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8) In plants, the carbohydrates are stored in the form of _____________
a) Carbohydrates

b) Starch

c) Glycogen

d) Chlorophyll

b) Starch ( Pg. no.: )

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9) In animals, carbohydrates is stored in the form of ______________
a) fats

b) starch

c) glycogen

d) proteins

c) glycogen ( Pg. no.: )

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10) The final process of photosynthesis is reduction of Carbon Dioxide into
a) Carbohydrates

b) Glycogen

c) Glucose

d) Starch

a)Carbohydrates ( Pg. no.: )

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11) Massive amounts of gaseous exchange takes place in
a) stem

b) leaves

c) roots

d) flowers

b) leaves ( Pg. no.: )

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12) Caustic potash is a chemical that absorbs ___________ from it's atmosphere.
a) Carbon Monoxide

b) Oxygen

c) Hydrogen

d) Carbon Dioxide

d) Carbon Dioxide ( Pg. no.: )

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13) When the guard cells are turgid, they
a) open

b) close

c) both

d) none

a)open ( Pg. no.: )

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14) When guard cells lose water, they
a) open

b) shrink

c) both

d) none

b) shrink ( Pg. no.: )

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15) Which of the following nutrients is not taken by the plants from the soil:
a) Phosphorous

b) Magnesium

c) Iron

d) None of these

d) None of these ( Pg. no.: )

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16) ____________ is an essential element used in the synthesis of proteins and other compounds
a) Carbon

b) Oxygen

c) Nitrogen

d) Hydrogen

c) Nitrogen ( Pg. no.: )

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17) Amar - bel follows ____________ mode of nutrition
a) Saprophytic

b) Parasitic

c) Herbivoral

d) omnivoral

b) Parasitic ( Pg. no.: )

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18) In paramoecium, the food is moved by ___________
a) Pseudopodia

b) Cilia

c) Peristalsis

d) Diffusion

b) Cilia ( Pg. no.: )

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19) There are ________ pairs of salivary glands in human.
a) 2

b) 3

c) 4

d) 5

b) 3 ( Pg. no.: )

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20) Complex sugars are broken down by ___________ .
a) Pepsin

b) Protease

c) Amylase

d) Bile

c) Amylase ( Pg. no.: )

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21) The stomach is a __________ organ which _______________ when food enters it.
a) small,expands

b) large,contracts

c) small,contracts

d) large,expands

d) large,expands ( Pg. no.: )

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22) Pepsin requires a _________ medium to facilitate it's action.
a) acidic

b) basic

c) neutral

d) works best in any medium

a)acidic ( Pg. no.: )

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23) The acidic medium required by pepsin is given by
a) HNO3

b) HCl

c) HCOOH

d) CH3COOH

b) HCl ( Pg. no.: )

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24) The exit of food from stomach is ensured by _________ .
a) stomach muscle

b) anal sphincter

c) sphincter

d) intestine

c) sphincter ( Pg. no.: )

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25) _________ is the region of complete digestion of protein, fats & carbohydrates.
a) Large intestine

b) small intestine

c) Stomach

d) Mouth

b) small intestine ( Pg. no.: )

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26) X is an organism which only eats greens, Y is an organism which eats X. The length of large intestine is the longest in __________ .
a) X

b) Y

c) Equal in both

d) can't say

a)X ( Pg. no.: )

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27) Pancreatic enzymes are the most efficient in ___________ mediums.
a) acidic

b) basic

c) neutral

d) all

b) basic ( Pg. no.: )

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28) Find the incorrectly matched pair from the following :
a) Pepsin - Protein

b) Trypsin - Protein

c) Lipase - Emulsified fats

d) Amylase - Vitamins

d) Amylase - Vitamins ( Pg. no.: )

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29) The enzymes convert fats into ____________ .
a) Fatty acid

b) Glycerol

c) Globules

d) Both A and B

d) Both A and B ( Pg. no.: )

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30) Pyruvate is a _______ molecule
a) mono-carbon

b) bi-carbon

c) tri-carbon

d) poly-carbon

c) tri-carbon ( Pg. no.: )

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31) When the terminal phosphate linkage in ATP is broken using water, how much energy is released per mole?
a) 20.5 kJ

b) 30.5 kJ

c) 40.5 kJ

d) 50.5 kJ

b) 30.5 kJ ( Pg. no.: )

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32) Plants exchange gases by the process of :
a) Osmosis

b) Transpiration

c) Diffusion

d) Hydrolysis

c) Diffusion ( Pg. no.: )

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33) At night, when there is no photosynthesis, the main process that takes place is :
a) CO2 elimination

b) O2 elimination

c) Water absorption to compensate the loss of water

d) H2O elimination

a)CO2 elimination ( Pg. no.: )

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34) Organism A lives in water whereas organism B lives on land. Which the following organism have faster rate of breathing ?
a) A

b) B

c) Both

d) None of the above

a)A ( Pg. no.: )

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35) The site at which fishes intake water for respiration is ?
a) Gills

b) Nostrils

c) Mouth

d) All of the above

c) Mouth ( Pg. no.: )

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