Life Processes
Multiple Choice Questions
1.) Which of the following statements about the autotrophs is incorrect?
(a) They synthesize carbohydrates from carbon dioxide and water
in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in
the absence of sunlight
(d) They constitute the first trophic level in food chains
Answer: Answer is C. Because autotrophs can synthesize food in presence of light. They receive the light and can prepare the food.
2.) In which of the following groups of organisms, food material is broken down outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm
Answer: Answer is B. Because these yeast, mushroom, bread mold are saprophytes. As they feed on decaying organic matter.
3.) Select the correct statement
(a) Heterotrophs do not synthesize their own food
(b) Heterotrophs utilize solar energy for photosynthesis
(c) Heterotrophs synthesize their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates
Answer: Answer is A. Because other options are characteristics of autotrophs. The option A is only characteristics of heterotrophs. They cannot synthesize their own food material instead depend on others.
4.) Which is the correct sequence of parts in human alimentary canal?
(a) Mouth, stomach, small intestine, esophagus, large intestine
(b) Mouth, esophagus, stomach, large intestine, small intestine
(c) Mouth stomach esophagus small intestinelarge intestine
(d) Mouth esophagus stomach small intestine large intestine
Answer : Answer is D. Because the correct pathway of food from mouth to esophagus which 25 cm long tube to stomach and small intestine and large intestine.
5.) If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins
Answer: Answer is B. Salivary amylase responsible for digestion of starch which is polysaccharide and with the help of salivary amylase starch can be break down into its monomers.
6.) The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile
Answer: Answer is B. Mucus is present in the inner lining of stomach for the smooth movement of food.
7.) Which part of alimentary canal receives bile from the liver?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Esophagus
Answer: Answer is B. Bile enters into the small intestine from liver.
8.) A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(a) complex proteins
(b) simple proteins
(c) fats
(d) starch
Answer: Answer is D. Because when iodine comes in contact with starch, colour of the solution will turn to blue.
9.) In which part of the alimentary canal food is finally digested?
(a) Stomach
(b) Mouth cavity
(c) Large intestine
(d) Small intestine
Answer: Answer is D. Within the small intestine, the al form of food is finally digested.
10.) Choose the function of the pancreatic juice from the following
(a) trypsin digests proteins and lipase carbohydrates
(b) trypsin digests emulsified fats and lipase proteins
(c) trypsin and lipase digest fats
(d) trypsin digests proteins and lipase emulsified fats
Answer: Answer is D. Pancreatic juice have ability to digest protein and fat due to presence of enzymes trypsin and lipase.
11.) When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour
Answer: Answer is B. Because humans exhale the carbon dioxide and when carbon dioxide come in contact with lime, the production of white colored fluid take place.
(a) They synthesize carbohydrates from carbon dioxide and water
in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in
the absence of sunlight
(d) They constitute the first trophic level in food chains
Answer: Answer is C. Because autotrophs can synthesize food in presence of light. They receive the light and can prepare the food.
2.) In which of the following groups of organisms, food material is broken down outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm
Answer: Answer is B. Because these yeast, mushroom, bread mold are saprophytes. As they feed on decaying organic matter.
3.) Select the correct statement
(a) Heterotrophs do not synthesize their own food
(b) Heterotrophs utilize solar energy for photosynthesis
(c) Heterotrophs synthesize their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates
Answer: Answer is A. Because other options are characteristics of autotrophs. The option A is only characteristics of heterotrophs. They cannot synthesize their own food material instead depend on others.
4.) Which is the correct sequence of parts in human alimentary canal?
(a) Mouth, stomach, small intestine, esophagus, large intestine
(b) Mouth, esophagus, stomach, large intestine, small intestine
(c) Mouth stomach esophagus small intestinelarge intestine
(d) Mouth esophagus stomach small intestine large intestine
Answer : Answer is D. Because the correct pathway of food from mouth to esophagus which 25 cm long tube to stomach and small intestine and large intestine.
5.) If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins
Answer: Answer is B. Salivary amylase responsible for digestion of starch which is polysaccharide and with the help of salivary amylase starch can be break down into its monomers.
6.) The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile
Answer: Answer is B. Mucus is present in the inner lining of stomach for the smooth movement of food.
7.) Which part of alimentary canal receives bile from the liver?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Esophagus
Answer: Answer is B. Bile enters into the small intestine from liver.
8.) A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(a) complex proteins
(b) simple proteins
(c) fats
(d) starch
Answer: Answer is D. Because when iodine comes in contact with starch, colour of the solution will turn to blue.
9.) In which part of the alimentary canal food is finally digested?
(a) Stomach
(b) Mouth cavity
(c) Large intestine
(d) Small intestine
Answer: Answer is D. Within the small intestine, the al form of food is finally digested.
10.) Choose the function of the pancreatic juice from the following
(a) trypsin digests proteins and lipase carbohydrates
(b) trypsin digests emulsified fats and lipase proteins
(c) trypsin and lipase digest fats
(d) trypsin digests proteins and lipase emulsified fats
Answer: Answer is D. Pancreatic juice have ability to digest protein and fat due to presence of enzymes trypsin and lipase.
11.) When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour
Answer: Answer is B. Because humans exhale the carbon dioxide and when carbon dioxide come in contact with lime, the production of white colored fluid take place.
14.) Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from
alveolar air diffuses into blood and carbon dioxide from blood
into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide thanoxygen
(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv) (b) (ii) and (iii)
(c) (i) and (iii) (d) (ii) and (iv)
Answer: Answer is D.
15.) Which is the correct sequence of air passage during inhalation?
(a) Nostrils larynx pharynx trachea lungs
(b) Nasal passage trachea pharynx larynx alveoli
(c) larynx nostrils pharynx lungs
(d) Nostrils pharynx larynx trachea alveoli
Answer: Answer is D. Air enters the body through nasal cavity into pharynx, larynx, trachea and alveoli.
16.) During respiration exchange of gases take place in
(a) trachea and larynx
(b) alveoli of lungs
(c) alveoli and throat
(d) throat and larynx
Answer is B.During respiration exchange of gases take place in alveoli.
17.) Which of the following statement (s) is (are) true about heart?
(i) Left atrium receives oxygenated blood from different parts ofbody while right atrium receives deoxygenated blood from lungs
(ii) Left ventricle pumps oxygenated blood to different body partswhile right ventricle pumps deoxygenated blood to lungs
(iii) Left atrium transfers oxygenated blood to right ventricle whichsends it to different body parts
(iv) Right atrium receives deoxygenated blood from different partsof the body while left ventricle pumps oxygenated blood todifferent parts of the body
(a) (i)(b) (ii)(c) (ii) and (iv) (d) (i) and (iii)
Answer: Answer is C.
18.) What prevents backflow of blood inside the heart duringcontraction?
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above
Answer: Answer is A.
19.) Single circulation i.e., blood flows through the heart only onceduring one cycle of passage through the body, is exhibited by
(a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) Whale, Dolphin, Turtle
Answer: Answer is A.
20.) In which of the following vertebrate group/groups, heart doesnot pump oxygenated blood to different parts of the body?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from
alveolar air diffuses into blood and carbon dioxide from blood
into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide thanoxygen
(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv) (b) (ii) and (iii)
(c) (i) and (iii) (d) (ii) and (iv)
Answer: Answer is D.
15.) Which is the correct sequence of air passage during inhalation?
(a) Nostrils larynx pharynx trachea lungs
(b) Nasal passage trachea pharynx larynx alveoli
(c) larynx nostrils pharynx lungs
(d) Nostrils pharynx larynx trachea alveoli
Answer: Answer is D. Air enters the body through nasal cavity into pharynx, larynx, trachea and alveoli.
16.) During respiration exchange of gases take place in
(a) trachea and larynx
(b) alveoli of lungs
(c) alveoli and throat
(d) throat and larynx
Answer is B.During respiration exchange of gases take place in alveoli.
17.) Which of the following statement (s) is (are) true about heart?
(i) Left atrium receives oxygenated blood from different parts ofbody while right atrium receives deoxygenated blood from lungs
(ii) Left ventricle pumps oxygenated blood to different body partswhile right ventricle pumps deoxygenated blood to lungs
(iii) Left atrium transfers oxygenated blood to right ventricle whichsends it to different body parts
(iv) Right atrium receives deoxygenated blood from different partsof the body while left ventricle pumps oxygenated blood todifferent parts of the body
(a) (i)(b) (ii)(c) (ii) and (iv) (d) (i) and (iii)
Answer: Answer is C.
18.) What prevents backflow of blood inside the heart duringcontraction?
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above
Answer: Answer is A.
19.) Single circulation i.e., blood flows through the heart only onceduring one cycle of passage through the body, is exhibited by
(a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) Whale, Dolphin, Turtle
Answer: Answer is A.
20.) In which of the following vertebrate group/groups, heart doesnot pump oxygenated blood to different parts of the body?
(a) Pisces and amphibians
(b) Amphibians and reptiles
(c) Amphibians only
(d) Pisces only
Answer: D.
21.) Choose the correct statement that describes arteries.
(a) They have thick elastic walls, blood flows under high pressure;collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows underlow pressure and carry blood away from the heart to variousorgans of the body
(c) They have thick elastic walls, blood flows under low pressure;carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flowsunder high pressure and carry blood away from the heart todifferent parts of the body.
Answer: Answer is D.
22.) The filtration units of kidneys are called
(a) ureter
(b) urethra
(c) neurons
(d) nephrons
Answer: Answer is D. The filtration unit of kidney is nephron. Because neurons are present in brain and ureters and urethra are the parts of urinary system.
23.) Oxygen liberated during photosynthesis comes from
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose
Answer: Answer is A. When water molecules break down into OH and H, then oxygen releases from water.
24.) The blood leaving the tissues becomes richer in
(a) carbon dioxide
(b) water
(c) heamoglobin
(d) oxygen
Answer: Answer is A.
25.) Which of the following is an incorrect statement?
(a) Organisms grow with time
(b) Organisms must repair and maintain their structure
(c) Movement of molecules does not take place among cells
(d) Energy is essential for life processes
Answer: Answer is C.
26.) The internal (cellular) energy reserve in autotrophs is
(a) glycogen
(b) protein
(c) starch
(d) fatty acid
Answer is C.
27.) Which of the following equations is the summary ofphotosynthesis?
(a) 6CO2 + 12H2O –> C6H12O6 + 6O2+ 6H2O
(b) 6CO2 + H2O + Sunlight –> C6H12O6 + O2+ 6H2O
(c) 6CO2 + 12H2O + Chlorophyll + Sunlight –> C6H12O6 + 6O2+ 6H2O
(d) 6CO2 + 12H2O + Chlorophyll + Sunlight –> C6H12O6 + 6CO2+ 6H2O
Answer: Answer is C.
28.) Choose the event that does not occur in photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Reduction of carbon dioxide to carbohydrates
(c) Oxidation of carbon to carbon dioxide
(d) Conversion of light energy to chemical energy
Answer: Answer is C.
29.) The opening and closing of the stomatal pore depends upon
(a) oxygen
(b) temperature
(c) water in guard cells
(d) concentration of CO2 in stomata
Answer : Answer is C. It depends upon concentration of water in guard cells.
30.) Choose the forms in which most plants absorb nitrogen
(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen
(a) (i) and (ii) (b) (ii) and (iii)
(c) (iii) and (iv) (d) (i) and (iv)
Answer: Answer is B.
31.) Which is the first enzyme to mix with food in the digestive tract?
(a) Pepsin
(b) Cellulase
(c) Amylase
(d) Trypsin
Answer: Answer is C.
32.) Which of the following statement(s) is (are) correct?
(i) Pyruvate can be converted into ethanol and carbon dioxideby yeast
(ii) Fermentation takes place in aerobic bacteria
(iii) Fermentation takes place in mitochondria
(iv) Fermentation is a form of anaerobic respiration
(a) (i) and (iii) (b) (ii) and (iv)
(c) (i) and (iv) (d) (ii) and (iii)
Answer: Answer is A.
33.) Lack of oxygen in muscles often leads to cramps among cricketers.This results due to
(a) conversion of pyruvate to ethanol
(b) conversion of pyruvate to glucose
(c) non conversion of glucose to pyruvate
(d) conversion of pyruvate to lactic acid
Answer: Answer is D.
34.) Choose the correct path of urine in our body
(a) kidney ureter urethra urinary bladder
(b) kidney urinary bladder urethra ureter
(c) kidney ureters urinary bladder urethra
(d) urinary bladder kidney ureter urethra
Answer: Answer is C.
35.) During deficiency of oxygen in tissues of human beings, pyruvicacid is converted into lactic acid in the
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) golgi body
Answer: Answer is A.
(b) Amphibians and reptiles
(c) Amphibians only
(d) Pisces only
Answer: D.
21.) Choose the correct statement that describes arteries.
(a) They have thick elastic walls, blood flows under high pressure;collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows underlow pressure and carry blood away from the heart to variousorgans of the body
(c) They have thick elastic walls, blood flows under low pressure;carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flowsunder high pressure and carry blood away from the heart todifferent parts of the body.
Answer: Answer is D.
22.) The filtration units of kidneys are called
(a) ureter
(b) urethra
(c) neurons
(d) nephrons
Answer: Answer is D. The filtration unit of kidney is nephron. Because neurons are present in brain and ureters and urethra are the parts of urinary system.
23.) Oxygen liberated during photosynthesis comes from
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose
Answer: Answer is A. When water molecules break down into OH and H, then oxygen releases from water.
24.) The blood leaving the tissues becomes richer in
(a) carbon dioxide
(b) water
(c) heamoglobin
(d) oxygen
Answer: Answer is A.
25.) Which of the following is an incorrect statement?
(a) Organisms grow with time
(b) Organisms must repair and maintain their structure
(c) Movement of molecules does not take place among cells
(d) Energy is essential for life processes
Answer: Answer is C.
26.) The internal (cellular) energy reserve in autotrophs is
(a) glycogen
(b) protein
(c) starch
(d) fatty acid
Answer is C.
27.) Which of the following equations is the summary ofphotosynthesis?
(a) 6CO2 + 12H2O –> C6H12O6 + 6O2+ 6H2O
(b) 6CO2 + H2O + Sunlight –> C6H12O6 + O2+ 6H2O
(c) 6CO2 + 12H2O + Chlorophyll + Sunlight –> C6H12O6 + 6O2+ 6H2O
(d) 6CO2 + 12H2O + Chlorophyll + Sunlight –> C6H12O6 + 6CO2+ 6H2O
Answer: Answer is C.
28.) Choose the event that does not occur in photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Reduction of carbon dioxide to carbohydrates
(c) Oxidation of carbon to carbon dioxide
(d) Conversion of light energy to chemical energy
Answer: Answer is C.
29.) The opening and closing of the stomatal pore depends upon
(a) oxygen
(b) temperature
(c) water in guard cells
(d) concentration of CO2 in stomata
Answer : Answer is C. It depends upon concentration of water in guard cells.
30.) Choose the forms in which most plants absorb nitrogen
(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen
(a) (i) and (ii) (b) (ii) and (iii)
(c) (iii) and (iv) (d) (i) and (iv)
Answer: Answer is B.
31.) Which is the first enzyme to mix with food in the digestive tract?
(a) Pepsin
(b) Cellulase
(c) Amylase
(d) Trypsin
Answer: Answer is C.
32.) Which of the following statement(s) is (are) correct?
(i) Pyruvate can be converted into ethanol and carbon dioxideby yeast
(ii) Fermentation takes place in aerobic bacteria
(iii) Fermentation takes place in mitochondria
(iv) Fermentation is a form of anaerobic respiration
(a) (i) and (iii) (b) (ii) and (iv)
(c) (i) and (iv) (d) (ii) and (iii)
Answer: Answer is A.
33.) Lack of oxygen in muscles often leads to cramps among cricketers.This results due to
(a) conversion of pyruvate to ethanol
(b) conversion of pyruvate to glucose
(c) non conversion of glucose to pyruvate
(d) conversion of pyruvate to lactic acid
Answer: Answer is D.
34.) Choose the correct path of urine in our body
(a) kidney ureter urethra urinary bladder
(b) kidney urinary bladder urethra ureter
(c) kidney ureters urinary bladder urethra
(d) urinary bladder kidney ureter urethra
Answer: Answer is C.
35.) During deficiency of oxygen in tissues of human beings, pyruvicacid is converted into lactic acid in the
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) golgi body
Answer: Answer is A.
Comments
Post a Comment