CBSE Class 10 Biology Life Processes MCQs Set A

Question. During respiration exchange of O2 and CO2 takes place in       
(a) pharynx and larynx
(b) trachea and lung
(c) alveoli of lungs
(d) larynx and throat

Answer : C

Question. Which of the following enzymes get mixed with food in our mouth?           
(a) Trypsin
(b) Cellulose
(c) Pepsin
(d) Amylase

Answer : D

Question. The mode of nutrition in mushrooms is           
(a) heterotrophic
(b) autotrophic
(c) holozoic
(c) parasitic

Answer : A

Question. Which of the following statement(s) is/are not correct?       
(a) Bronchus is divided into bronchioles.
(b) The opening leading to the larynx is called glottis.
(c) During inhalation, ribs move inward and diaphragm is raised.
(d) Oxygen has more affinity with haemoglobin than CO2.

Answer : C

Question. Choose the correct statement(s).       
(a) Alveoli increase the surface area for exchange of gases.
(b) Oxygen from alveolar air diffuses into blood and CO2 from blood diffuses into alveolar air.
(c) From the larynx the air goes to pharynx.
(d) The trachea is not connected to bronchi.

Answer : A

Question. The mode of nutrition in parasitic organisms is        
(a) heterotrophic
(b) autotrophic
(c) both autotrophic and heterotrophic
(d) none of the above

Answer : A

Question. The undigested food is finally removed from the body through       
(a) large intestine
(b) small intestine
(c) anus
(d) villi

Answer : C

Question. Which of the following is not a 3-carbon molecule?       
(a) Pyruvate
(b) Ethanol
(c) Lactic acid
(d) All of the above

Answer : B

Question :   In Photosynthetic process, atmospheric carbon di oxide is _______ to carbohydrates  
(a) oxidised  
(b) Reduced  
(c) Neutralised  
(d) Burnt

Question :   When water enters the guard cells the stomata  
(a) Opens  
(b) Closes 
(c) Open or closes
(d) No effect

Answer : A

Question :   On seeing good food our mouth waters. This fluid is actually  
(a) Water
(b) Hormone 
(c) Enzyme  
(d) None of the above

Answer : C

Question :   The enzyme Pepsin is inactive in stomach without the presence of  
(a) Nitric Acid  
(b) Hydrochloric acid  
(c) Acetic acid  
(d) Butyric acid

Answer : B

Question :   Villi present on the inner lining of the intestinal wall  
(a) Secretes enzymes for digestion  
(b Secretes hormones   
(c) Decreases the surface area for absorption
(d) Increases the surface area for absorption

Answer : D

Question : During cellular respiration one molecule of glucose is first broken down into two molecules of ________
(a) Acetic acid  
(b) Pyruvic acid
(c) Lactic acid
(d) None of the above

Answer : B

Question :   Rajib was absent in the class because of muscle pain which he claims to be due to excess physical exercise he had done yesterday. This pain is due to 
(a) Formation of lactic acid
(b) Formation of acetic acid
(c) Formation of Pyruvic acid
(d) Formation of Hydrochloric acid

Answer : A

Question :   Right part of the human heart contains  
(a) Oxygenated blood  
(b) Mixed blood  
(c) Deoxygenated blood  
(d) No blood 

Question :   The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue called
(a) Xylem  
(b) Sclerenchyma  
(c) Phloem  
(d) Collenchyma

Question :  In human each kidney has large numbers of filtration units called ___  
(a) Neutrons  
(b) Neurons 
(c) Neptune  
(d) Nephrons

Answer :  D

Question : Single cell obtain its nutrition by
(a) alimentary canal 
(b) phagocytosis 
(c) buccal cavity
(d) plasmolysis 

Answer : B

Question.  In Photosynthetic process, atmospheric carbon di oxide is _______ to carbohydrates
(a) oxidised
(b) Reduced
(c) Neutralised
(d) Burnt

Answer : B

Question. When water enters the guard cells the stomata
(a) Opens
(b) Closes
(c) Open or closes
(d) No effect

Answer : A

Question. On seeing good food our mouth waters. This fluid is actually
(a) Water
(b) Hormone 
(c) Enzyme
(d) None of the above

Answer : C

Question. The enzyme Pepsin is inactive in stomach without the presence of
(a) Nitric Acid
(b) Hydrochloric acid
(c) Acetic acid
(d) Butyric acid

Answer : B

Question. Villi present on the inner lining of the intestinal wall
(a) Secretes enzymes for digestion
(b) Secretes hormones
(c) Decreases the surface area for absorption
(d) Increases the surface area for absorption

Answer : D

Question. During cellular respiration one molecule of glucose is first broken down into two molecules of ________
(a) Acetic acid
(b) Pyruvic acid
(c) Lactic acid
(d) None of the above

Answer : B

Question. Rajib was absent in the class because of muscle pain which he claims to be due to excess physical exercise he had done yesterday. This pain is due to 
(a) Formation of lactic acid
(b) Formation of acetic acid
(c) Formation of Pyruvic acid
(d) Formation of Hydrochloric acid

Answer : A

Question. Right part of the human heart contains
(a) Oxygenated blood
(b) Mixed blood
(c) Deoxygenated blood
(d) No blood 

Answer : C

Question. The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue called
(a) Xylem
(b) Sclerenchyma
(c) Phloem
(d) Collenchyma

Answer : C

Question. In human each kidney has large numbers of filtration units called ___
(a) Neutrons
(b) Neurons
(c) Neptune
(d) Nephrons

Answer : D

Question : The major source of energy on earth is
(a) autotrophs 
(b) heat energy 
(c) animals 
(d) solar energy

Answer : D

Question : Human being’s nutrition can be categorized as
(a) saprotrophic 
(b) holozoic 
(c) parasitic 
(d) symbiotic

Answer : B

Question : Living being on which parasites resides called as
(a) host 
(b) ligand 
(c) receptor 
(d) anchorage

Answer : A

Question : The major heterotrophs spread globally are
(a) saprotrophs
(b) parasites 
(c) holozoics 
(d) symbiotics

Answer : A

Question : Autotroph is the other name of
(a) herbs 
(b) algae 
(c) shurbs 
(d) all of these

Answer : D

Question : Saprotrophs are called as decomposers because
(a) they accumulate the dead & decay 
(b) they regulate the dead & deccay
(c) they anabolize the dead & decay 
(d) they catabolize the dead & decay

Answer : D

Question : Sulphur bacteria, Nitrogen bacteria are the members opted the nutrition of type
(a) phototrophic 
(b) saprophytic 
(c) chemotrophic 
(d) symbiotic

Answer : C

Question : Lichen is the example of _____ nutrition
(a) autotrophism 
(b) parasitism 
(c) symbiotism 
(d) saprotrophism

Answer : C

Question : Bacteria are
(a) autotrophic 
(b) heterotrophic 
(c) saprotrophic 
(d) all of the these

Answer : D

Question : Respiration is
(a) intake of O₂ 
(b) break down of food (C₆H₁₂O₆)
(c) release of CO₂ 
(d) all of these

Answer : D

Question : Breathing differ from respiration as
(a) it exchange O₂ and CO₂ 
(b) It produces energy
(c) it is the metabolic process 
(d) both (b) and (c)

Answer : D

Question : The food after digestion at molecular level is called as
(a) pyruvate
(b) starch
(c) malate 
(d) glucose

Answer : D

Question : Total amount of ATP produce in aerobic respiration
(a) no ATP
(b) 26 ATP 
(c) 38 ATP 
(d) 2 ATP

Answer : C

Question : The breakdown of 6 carbon sugar in cell takes place by
(a) kreb cycle 
(b) Both (a) and (c)
(c) glycolysis
(d) none of these

Answer : B

Question : If the respiration is aerobic, the breakdown product of glucose produces
(a) CO₂ 
(b) 38 ATP
(d) H₂O 
(d) all of these

Answer : D

Question : Yeast cell produces
(a) CO₂ and H₂O 
(b) ethanol + CO₂
(c) ethanol
(d) lactic acid 

Answer : B

Question : The amount of energy produce in anaerobic respiration is
(a) 12 ATP
(b) 22 ATP 
(c) 2 ATP 
(d) 222 ATP 

Answer : C

Question : The power-house of cell is
(a) lysosome 
(b) mitochondria
(c) cytoplasm
(d) nucleus

Answer : B

Question : Pyruvic acid is catabolize in _______ anaerobic (yeast) respiration
(a) CO₂ and H₂O
(b) lactic acid, CO₂
(c) ethanol and lactic acid 
(d) ethanol and CO 

Answer : D