MCQs for Class 10 Science Chapter 6 Life Processes

MCQs for Class 10 Science Chapter 6 Life Processes: In this article, we have covered all the important MCQs for Free for Class 10 Term 1 2021-22 Board Exams. In accordance with the latest pattern, Padhle is here with MCQ Questions for Class 10.

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Class 10 for MCQ Science Chapter 6 Life Processes

Question 1:
The chlorophyll in photosynthesis is used for
(a)   Absorbing light
(b)   Breaking down water molecule
(c)  No function
(d)   Reduction of CO₂

Answer-(a) Absorbing light

Question 2:
The enzyme responsible for the digestion of proteins in the small intestine is:
(a) Pepsin
(b) Trypsin
(c) Amylase
(d) Lipase

Answer: (a) Pepsin

Question 3:
Which of the following are energy foods?
(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage

Answer: (a)Carbohydrates and fats

Question 4:
In which group of the organisms the food material is broken down outside the body ?
(a) Mushroom, green plants, amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, amoeba, cuscuta
(d) Cuscuta, lice, tapeworm

Answer : (b)Yeast, mushroom, bread mould

Question 5:
Proteins after digestion are converted into
(a) Carbohydrates
(b) Small globules
(c) Amino acids
(d) Starch

Answer: (c) Amino acids

Question 6:
The part where the exchange of gases occurs during respiration is:
(a) Lungs and larynx
(b) Alveoli and throat
(c) Throat and lungs
(d) Alveoli and capillaries

Answer: (d) Alveoli and capillaries

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Question 7:
In which mode of nutrition an organism de-rives its food from the body of another living organism without killing it?
(a) Saprotrophic nutrition
(b) Parasitic nutrition
(c) Holozoic nutrition
(d) Autotrophic nutrition

Answer: (b) Parasitic nutrition

Question 8:
Select the correct statement –
(a) Hetrotrophs make their food
(b) Heterotrophs utilize solar energy to make food
(c) Heterotrophs do not make their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Answer: (c) Heterotrophs do not make their own food

Question 9:
Carbohydrates in the plants are stored in the form of
(a) Glycogen
(b) Starch
(c) Glucose
(d) Maltose

Answer: (b) Starch

Question 10:
The backflow of blood during the pumping of blood by heart is prevented by:
(a) Walls of ventricles
(b) Walls of the atrium
(c) Valves in the heart
(d) Walls between atria and ventricles

Answer: (c) Valves in heart

Question 11:
The mode of nutrition found in fungi is:
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition

Answer: (d) Saprotrophic nutrition

Question 12:
Which of the following statements about autotrophs is incorrect ?
(a) They synthesize carbohydrates by using carbon dioxide , water in presence of sunlight and chlorophyll
(b) They store carbohydrates in form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They form the first trophic level in food chain

Answer: (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight

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Question 13:
Main site of photosynthesis
(a) Leaf
(b) Stem
(c) Chloroplast
(d) Guard cells

Answer: (c) Chloroplast

Question 14:
The process of digestion is completed by:
(a) Intestinal juice
(b) trypsin
(c) bile juice
(d) pepsin

Answer: (a) Intestinal juice

Question 15:
Roots of the plants absorb water from the soil through the process of:
(a) diffusion
(b) transpiration
(c) osmosis
(d) None of these

Answer: (c) osmosis

Question 16:
Which of these reactions occur in photosynthesis?
(a) Carbon dioxide is reduced and water is oxidized
(b) water is reduced and carbon dioxide is oxidized
(c) carbon dioxide and water are oxidized
(d) carbon dioxide and water are reduced

Answer: (a) Carbon dioxide is reduced and water is oxidized

Question 17:
The small pores present of the leaf’s surface are called
(a) Stomata
(b) Chlorophyll
(c) Guard cells
(d) None of these

Answer: (a) Stomata

Question 18:
The extracellular fluid released from the capillaries is:
(a) serum
(b) plasma
(c) lymph
(d) mucus

Answer: (b) plasma

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Question 19:
The site of photosynthesis in the cells of a leaf is
(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm

Answer: (a) chloroplast

Question 20:
A few drops of iodine solution were added to rice water. The solution turned blue black in colour. This indicates rice water has –
(a) complex proteins
(b) simple proteins
(c) starch
(d) Fats

Answer: (c) starch

Question 21:
Photosynthesis is a
(a) Catabolic process
(b) Parabolic process
(c) Amphibolic process
(d) Photochemical process

Answer: (d) Photochemical process

Question 22:
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: (d) starch

Question 23:
In amoeba, food is digested in the:
(a) food vacuole
(b) mitochondria
(c) pseudopodia
(d) chloroplast

Answer: (a) food vacuole

Question 24:
Which is the correct sequence –
(a) mouth → stomach → small intestine → esophagus → large intestine
(b) mouth → esophagus → stomach → large intestine → small intestine
(c) mouth → stomach → esophagus → small intestine → large intestine
(d) mouth → esophagus → stomach → small intestine → large intestine

Answer: (d) mouth → esophagus → stomach → small intestine → large intestine

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Question 25:
Opening and closing of pores is a function performed by
(a) Stomata
(b) Chlorophyll
(c) Chloroplast
(d) Guard cells

Answer: (d) Guard cells

Question 26:
In which part of the alimentary canal food is finally digested?
(a) Stomach
(b) Mouth cavity
(c) Large intestine
(d) Small intestine

Answer: (d) Small intestine

Question 27:
Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?
(a) Starch breaking down into sugars.
(b) Proteins breaking down into amino acids.
(c) Absorption of vitamins.
(d) Fats breaking down into fatty acids and glycerol.

Answer: (a) Starch breaking down into sugars.

Question 28:
If salivary amylase is lacking in saliva, which of the event in the mouth 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: (b) starch breaking down into sugars

Question 29:
Which element is used in the synthesis of proteins?
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide

Answer: (c) Nitrogen

Question 30:
When air is blown from the 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 vapor

Answer: (b) carbon dioxide

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Question 31:
Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver

Answer: (b) Small intestine

Question 32:
The inner lining of the stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Mucus
(b) Salivary amylase
(c) Pepsin
(d) Bile

Answer: (a) Mucus

Question 33:
Temporary finger like extensions on amoeba are called
(a) Cell membrane
(b) Cell wall
(c) Pseudopodia
(d) Cilia

Answer: (c) Pseudopodia

Question 34:
What prevents backflow of blood inside the heart during contraction?
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

Answer: (a) Valves in heart

Question 35:
The contraction and expansion movement of the walls of the food pipe is called:
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion

Answer: (c) peristaltic movement

Question 36:
Which part of alimentary canal receives bile from liver –
(a) stomach
(b) small intestine
(c) large intestine
(d) oesophagus

Answer: (b) small intestine

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Question 37:
Bile juice is secreted by
(a) Stomach
(b) Pancreas
(c) Small intestine
(d) Liver

Answer: (d) Liver

Question 38:
In which of the following vertebrate group/groups, heart does not 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) Pisces only

Question 39:
When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains:
(a) fats
(b) complex proteins
(c) starch
(d) simple proteins

Answer: (c) starch

Question 40:
In which part of alimentary canal food is finally digested ?
(a) large intestine
(b) Stomach
(c) Mouth cavity
(d) small intestine

Answer: (d) small intestine

Question 41:
Which of these juices is secreted by pancreas?
(a) Trypsin
(b) Pepsin
(c) Bile juice
(d) Both I and II

Answer: (c) Bile juice

Question 42:
Which of the following equations is the summary of photosynthesis?
(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: (c) 6CO₂ + 12H₂O + Chlorophyll + Sunlight → C₆H₁₂O₆ + 6O₂ + 6H₂O

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Question 43:
The exit of unabsorbed food material is regulated by
(a) liver
(b) anus
(c) small intestine
(d) anal sphincter

Answer: (d) anal sphincter

Question 44:
Choose the function of pancreatic juice from following :
(a) Trypsin digests proteins and lipase digests carbohydrates
(b) Trypsin digests emulsified fats and lipase digests proteins
(c) Trypsin and lipase digest fats
(d) Trypsin digests proteins and lipase digests emulsified fats

Answer: (d) Trypsin digests proteins and lipase digests emulsified fats

Question 45:
Lipase acts on
(a) Amino acids
(b) Fats
(c) Carbohydrates
(d) All of these

Answer: (b) Fats

Question 46:
Which is the first enzyme to mix with food in the digestive tract?
(a) Pepsin
(b) Cellulose
(c) Amylase
(d) Trypsin

Answer: (c) Amylase

Question 47:
What are the products obtained by anaerobic respiration in plants?
(a) Lactic acid + Energy
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate

Answer: (c) Ethanol + Carbon dioxide + Energy

Question 48:
The correct sequence of anaerobic respiration –
(a) Glucose → pyruvate → lactic acid
(b) glucose → pyruvate → carbon dioxide + ethanol
(c) glucose → pyruvate → ADP→ lactic acid
(d) glucose -→ pyruvate → carbon dioxide + ethanol + energy

Answer: (d) glucose -→ pyruvate → carbon dioxide + ethanol + energy

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Question 49:
Respiratory pigment in human body is
(a) Chlorophyll
(b) Water
(c) Blood
(d) hemoglobin

Answer: (d) hemoglobin

Question 50:
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: (d) conversion of pyruvate to lactic acid

Question 51:
The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus

Answer: (b) mitochondria

Question 52:
The pancreatic juice doesn’t contain following enzymes-
(a) Trypsin
(b) Amylase
(c) Lipase
(d) Ptyalin

Answer: (d) Ptyalin

Question 53:
Blood consist of what fluid medium?
(a) Lymph
(b) Platelets
(c) Plasma
(d) All of these

Answer: (c) Plasma

Question 54:
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: (c) kidney → ureters → urinary bladder → urethra

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Question 55:
The glycolysis process occurs in which part of the cell?
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast

Answer: (a) Cytoplasm

Question 56:
The pancreas pours their secretion into ___.
(a) Small intestine
(b) large intestine
(c) stomach
(d) Duodenum

Answer: (d) Duodenum

Question 57:
One cell-thick vessels are called
(a) Arteries
(b) Veins
(c) Capillaries
(d) Pulmonary artery

Answer: (c) Capillaries

Question 58:
Name the substances whose build-up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate

Answer: (b) Lactic acid + Energy

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Question 59:
Name the pores in a leaf through which the respiratory exchange of gases takes place.
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata

Answer: (d) Stomata

Question 60:
The respiratory pigment in human beings is:
(a) carotene
(b) chlorophyll
(c) hemoglobin
(d) mitochondria

Answer: (c) hemoglobin

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