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50 mcq on life processes class 10 Biology with answers
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mcq life processes class 10 with answers pdf download
Which process transfers a source of energy from outside the body of an organism to the inside?
A. Respiration
B. Nutrition
C. Excretion
D. Photosynthesis
Answer: B. Nutrition
What is the role of enzymes in heterotrophic organisms?
A. They absorb light energy.
B. break down complex substances.
C. They store energy in the form of starch.
D. They facilitate the absorption of water through stomata.
Answer: B. break down complex substances.
In the process of photosynthesis, what happens during the absorption of light energy?
A. Splitting of water molecules into hydrogen and oxygen.
B. Conversion of light energy to chemical energy.
C. Reduction of carbon dioxide to carbohydrates.
D. All of the above
Answer: D. All of the above
How do stomata function in relation to photosynthesis?
A. They store excess carbohydrates.
B. They absorb nitrogen from the atmosphere.
C. They facilitate gaseous exchange and regulate water loss.
D. They convert light energy into chemical energy.
Answer: C. They facilitate gaseous exchange and regulate water loss.
Which organisms are considered autotrophs?
A. Animals and fungi
B. Green plants and some bacteria
C. Parasites and decomposers
D. All of the above
Answer: B. Green plants and some bacteria
What is the main function of villi in the small intestine?
A. To secrete digestive enzymes
B. To increase the surface area for absorption
C. To produce bile juice
D. To regulate the passage of food
Answer: B. To increase the surface area for absorption
What is the main purpose of bile salts in digestion?
A. To digest proteins
B. To break down fats into smaller globules
C. To convert carbohydrates into glucose
D. To neutralize stomach acid
Answer: B. To break down fats into smaller globules
How do Amoeba take in food?
A. Using cilia to move food to a specific spot
B. Through finger-like extensions called pseudopodia
C. By absorbing nutrients through their entire surface
D. By using a specialized digestive tract
Answer: B. Through finger-like extensions called pseudopodia
What causes dental caries or tooth decay?
A. Lack of vitamins
B. Bacteria producing acids from sugars
C. Excessive brushing
D. Insufficient saliva production
Answer: B. Bacteria producing acids from sugars
Which of the following is a heterotrophic mode of nutrition?
A. Photosynthesis in green plants
B. Parasitism in ticks and lice
C. Conversion of water to carbohydrates
D. Absorption of light by chlorophyll
Answer: B. Parasitism in ticks and lice
Which organisms do not require specific organs for taking in food or exchanging gases due to their simple body design?
A. Multicellular organisms
B. Single-celled organisms
C. Autotrophic organisms
D. Heterotrophic organisms
Answer: B. Single-celled organisms
What happens to the stomatal pores when the guard cells shrink?
A. The pores open.
B. The pores close.
C. The pores enlarge.
D. The pores dissolve.
Answer: B. The pores close.
Which of the following is NOT a function of the alimentary canal?
A. Digestion of food
B. Absorption of nutrients
C. Circulation of blood
D. Excretion of waste
Answer: C. Circulation of blood
What enzyme is found in saliva that helps break down starch?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin
Answer: C. Amylase
Which of the following statements is true about the process of respiration in organisms?
A. It involves the direct absorption of nutrients from the soil.
B. It involves acquiring oxygen to break down food for cellular needs.
C. It involves the production of carbohydrates from carbon dioxide.
D. It only occurs in autotrophic organisms.
Answer: B. It involves acquiring oxygen to break down food for cellular needs.
What is the main function of the hydrochloric acid in the stomach?
A. To emulsify fats
B. To create an acidic medium for pepsin
C. To neutralize alkaline food
D. To break down carbohydrates
Answer: B. To create an acidic medium for pepsin
Which type of nutrition involves organisms making their own food using inorganic substances?
A. Heterotrophic nutrition
B. Autotrophic nutrition
C. Parasitic nutrition
D. Saprophytic nutrition
Answer: B. Autotrophic nutrition
Which organ is primarily responsible for nutrient absorption in humans?
A. Stomach
B. Liver
C. Small intestine
D. Large intestine
Answer: C. Small intestine
What do plants store their excess carbohydrates as?
A. Glycogen
B. Starch
C. Cellulose
D. Glucose
Answer: B. Starch
Which of the following processes is involved in the uptake of oxygen for the breakdown of food sources for cellular needs?
A. Nutrition
B. Photosynthesis
C. Respiration
D. Excretion
Answer: C. Respiration
What is the primary purpose of excretion in multicellular organisms?
A. To store energy
B. To absorb nutrients
C. To remove harmful by-products of chemical reactions
D. To facilitate photosynthesis
Answer: C. To remove harmful by-products of chemical reactions
Which part of the digestive system secretes hydrochloric acid and pepsin?
A. Small intestine
B. Mouth
C. Stomach
D. Large intestine
Answer: C. Stomach
What is the main function of guard cells in plants?
A. Absorbing water from the soil
B. Regulating the opening and closing of stomatal pores
C. Storing carbohydrates as starch
D. Converting light energy to chemical energy
Answer: B. Regulating the opening and closing of stomatal pores
Which process describes autotrophic organisms taking in carbon dioxide and water to produce carbohydrates?
A. Respiration
B. Nutrition
C. Photosynthesis
D. Excretion
Answer: C. Photosynthesis
What are the main components produced when water molecules are split during photosynthesis?
A. Carbon dioxide and glucose
B. Hydrogen and oxygen
C. Chlorophyll and sunlight
D. Carbohydrates and nitrogen
Answer: B. Hydrogen and oxygen
Which of the following organisms rely on a parasitic nutritive strategy?
A. Green plants
B. Bacteria
C. Leeches and ticks
D. Amoeba
Answer: C. Leeches and ticks
What role does saliva play in the digestion process?
A. Breaking down fats into fatty acids
B. Neutralizing stomach acid
C. Breaking down starch into sugars
D. Emulsifying fats
Answer: C. Breaking down starch into sugars
Which digestive enzyme is found in saliva?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin
Answer: C. Amylase
In which part of the digestive system does the majority of nutrient absorption occur?
A. Stomach
B. Small intestine
C. Large intestine
D. Mouth
Answer: B. Small intestine
Which of the following is NOT a function of the small intestine?
A. Complete digestion of carbohydrates, proteins, and fats
B. Absorption of digested nutrients
C. Production of bile juice
D. Neutralizing acidic food from the stomach
Answer: C. Production of bile juice
What triggers the opening of stomatal pores in plants?
A. Swelling of guard cells with water
B. Absorption of sunlight by chlorophyll
C. Reduction of carbon dioxide
D. Conversion of glucose to starch
Answer: A. Swelling of guard cells with water
Which part of the plant primarily takes up water for photosynthesis?
A. Stomata
B. Guard cells
C. Roots
D. Chloroplasts
Answer: C. Roots
Which of the following statements about heterotrophic nutrition is true?
A. It involves the use of inorganic sources for energy.
B. It depends directly or indirectly on autotrophs.
C. It is exclusive to green plants and bacteria.
D. It does not require enzymes for digestion.
Answer: B. It depends directly or indirectly on autotrophs.
What is the primary by-product of respiration that needs to be excreted from the body?
A. Oxygen
B. Carbon dioxide
C. Water
D. Carbohydrates
Answer: B. Carbon dioxide
Which of the following digestive processes occur in the stomach?
A. Conversion of proteins to amino acids
B. Breakdown of fats into fatty acids
C. Digestion of starch into sugars
D. Mixing food with digestive juices and hydrochloric acid
Answer: D. Mixing food with digestive juices and hydrochloric acid
How is food moved along the digestive tract?
A. By rhythmic contractions of the canal’s muscles
B. By the force of gravity
C. Through active transport mechanisms
D. By the action of cilia
Answer: A. By rhythmic contractions of the canal’s muscles
Which of the following nutrients is primarily absorbed in the large intestine?
A. Proteins
B. Carbohydrates
C. Fats
D. Water
Answer: D. Water
How do fungi like bread moulds obtain their nutrition?
A. Through photosynthesis
B. By breaking down food material outside their body and then absorbing it
C. By taking in whole food particles and breaking them down inside their body
D. By using cilia to move food to a specific spot
Answer: B. By breaking down food material outside their body and then absorbing it
What is the function of pancreatic juice in the digestive system?
A. To break down proteins into amino acids
B. To emulsify fats
C. To neutralize the acidic food from the stomach
D. To break down carbohydrates into glucose
Answer: A. To break down proteins into amino acids
What protects the inner lining of the stomach from the action of hydrochloric acid?
A. Mucus
B. Bile salts
C. Enzymes
D. Villi
Answer: A. Mucus