Life Processes Class 10 MCQs Questions with Answers
Question 1.
The autotrophic mode of nutrition requires:
(a) carbon dioxide and water
(b) chlorophyll
(c) sunlight
(d) all of the above
Answer:
(d) all of the above
Question 2.
The largest gland in human body is:
(a) liver
(b) gastric glands
(c) pancreas
(d) salivary glands.
Answer:
(a) liver
Question 3.
Number of salivary glands found in man are:
(a) one pair
(b) two pairs
(c) three pairs
(d) five pairs
Answer:
(c) three pairs
Question 4.
Pancreatic juice helps in the digestion of:
(a) proteins
(b) proteins and fats
(c) proteins and carbohydrates
(d) proteins, carbohydrates and fats
Answer:
(d) proteins, carbohydrates and fats
Question 5.
ATP and NADP 2H are produced in:
(a) Mitochondria
(b) Chloroplast
(c) Peroxisomes
(d) Lysosomes
Answer:
(a) Mitochondria
Question 6.
Oxygen evolved during photosynthesis comes from:
(a) water
(b) CO2
(c) soil
(d) atmosphere.
Answer:
(a) water
Question 7.
Rate of photosynthesis is high in:
(a) orange light
(b) green light
(c) red light
(d) yellow light
Answer:
(c) red light
Question 8.
The ultimate source of all metabolic energy on our earth is:
(a) green plants
(b) the sun
(c) O2
(d) O2 and H2O.
Answer:
(b) the sun
Question 9.
Light reaction takes place in:
(a) grana
(b) stroma
(c) mitochondria
(d) leucoplast.
Answer:
(a) grana
Question 10.
Plants purify air by:
(a) transpiration
(b) photosynthesis
(c) respiration
(d) absorption of water
Answer:
(b) photosynthesis
Question 11.
In which process CO2 is given out:
(a) photosynthesis
(b) respiration
(c) transpiration
(d) translocation.
Answer:
(b) respiration
Question 12.
Excess glucose is stored in our body in the form of:
(a) glycogen
(b) fat
(c) protein
(d) cholesterol.
Answer:
(a) glycogen
Question 13.
Trypsin enzyme is found in:
(a) gastric juice
(b) bile juice
(c) pancreatic juice
(d) intestinal juice
Answer:
(c) pancreatic juice
Question 14.
Which is the correct sequence of the air passage in man:
(a) Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Alveoli
(b) Nasal cavity → Larynx → Pharynx → Trachea → Bronchi → Alveoli
(c) Nasal cavity → Pharynx → Trachea → Larynx → Bronchi → Alveoli
(d) Nasal cavity → Trachea → Larynx → Bronchi → Alveoli
Answer:
(a) Nasal cavity → Pharynx → Larynx → Trachea – Bronchi → Alveoli
Question 15.
Number of lobes in right and left lungs of man are:
(a) 3 and 2
(b) 2 and 3
(c) 4 and 2
(d) 2 and 4
Answer:
(a) 3 and 2
Question 16.
In lungs CO2 rich blood comes from:
(a) different parts of the body
(b) left ventricle
(c) right ventricle
(d) liver
Answer:
(c) right ventricle
Question 17.
Blood vessel which carries oxygenated blood from lungs is:
(a) pulmonary vein
(b) pulmonary artery
(c) coronary artery
(d) superior venacava
Answer:
(a) pulmonary vein
Question 18.
Rate of respiration in man is:
(a) about 28 times per minute
(b) 12 to 15 times per minute
(c) 25 times per minute
(d) 72 times per minute
Answer:
(b) 12 to 15 times per minute
Question 19.
Number of alveoli in lungs is:
(a) 30 thousand
(b) 30 lac
(c) 3 crore
(d) 30 crore
Answer:
(d) 30 crore
Question 20.
Lungs are enclosed in:
(a) perichondrium
(b) peritoneum
(c) pleural membrane
(d) pericardium.
Answer:
(c) pleural membrane
Question 21.
Lymph does not contain:
(a) water
(b) white blood corpuscles
(c) proteins
(d) red blood corpuscles
Answer:
(d) red blood corpuscles
Question 22.
Which blood corpuscles destroy bacteria?
(a) W.B.C
(b) R.B.C
(c) blood platelets
(d) all these
Answer:
(a) W.B.C.
Question 23.
Main function of haemoglobin is:
(a) reproduction
(b) to kill harmful bacteria
(c) transport of O2
(d) to make blood colourless
Answer:
(c) transport of O2
Question 24.
Arteries have:
(a) thick wall without valves
(b) thick wall with valves
(c) thin wall with valves
(d) thin wall without valves
Answer:
(a) thick wall without valves
Question 25.
During respiration energy is stored in the form of:
(a) ADP
(b) ATP
(c) NADP
(d) inorganic phosphate.
Answer:
(b) ATP
Question 26.
Glycolysis takes place in:
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) ribosome.
Answer:
(a) cytoplasm
Question 27.
Which of the following substance is forced during anaerobic respiration?
(a) ethyl alcohol
(b) glycerol
(c) glucose
(d) ethylene
Answer:
(a) ethyl alcohol
Question 28.
In plants respiration takes place:
(a) during day time only
(b) during night time only
(c) during evening time only
(d) during day and night
Answer:
(d) during day and night
Question 29.
During respiration in human body:
(a) new cells are formed
(b) glucose is oxidized
(c) proteins are formed
(d) glucose is formed
Answer:
(b) glucose is oxidized
Question 30.
During aerobic respiration one molecule of glucose produces:
(a) 32 ATP
(b) 19 ATP
(c) 38 ATP
(d) 30 ATP
Answer:
(c) 38 ATP
Question 31.
Translocation of food takes place by:
(a) xylem
(b) phloem
(c) parenchyma
(d) cambium
Answer:
(b) phloem
Question 32.
Pulmonary vein brings blood into:
(a) right auricle
(b) left auricle
(c) left ventricle
(d) right ventricle
Answer:
(a) right auricle
Question 33.
Which part of the alimentary canal of man does not secretes enzyme?
(a) mouth
(b) oesophagus
(c) stomach
(d) intestine
Answer:
(b) oesophagus
Question 34.
Amoeba ingests food with the help of:
(a) cilia
(b) mouth
(c) flagella
(d) pseudopodia
Answer:
(d) pseudopodia
Question 35.
Impure blood from right ventricle goes into the:
(a) lungs
(b) heart
(c) skin
(d) liver
Answer:
(a) lungs
Question 36.
The air is purified in the following process by plants:
(a) transpiration
(b) photosynthesis
(c) respiration
(d) reproduction.
Answer:
(b) photosynthesis
Question 37.
Food is translocated by phloem in the form of:
(a) sucrose
(b) protein
(c) hormone
(d) fats
Answer:
(a) sucrose
Question 38.
Blood pressure is measured by:
(a) thermometer
(b) barometer
(c) galvanometer
(d) sphygmomanometer
Answer:
(d) sphygmomanometer
Question 39.
Urea is produced from ammonia in the body of a man in:
(a) liver
(b) kidney
(c) spleen
(d) intestine
Answer:
(a) liver
Question 40.
Malpighian body consists of:
(a) uriniferous tubule
(b) Bowman’s caspsule and glomerulus
(c) Bowman’s capsule and neck
(d) two limbs of loop of Henle.
Answer:
(b) Bowman’s caspsule and glomerulus
Question 41.
Pulmonary vein opens at:
(a) right auricle
(b) left auricle
(c) left ventricle
(d) right ventricle
Answer:
(b) left auricle
Question 42.
Leaf like cartilaginous structure hanging in oesophagus is called:
(a) epipharynx
(b) epiglottis
(c) alveoli
(d) mucilage sheath.
Answer:
(b) epiglottis
Question 43.
Un-oxidised blood is circulated through pulmonary arteries into:
(a) heart
(b) lungs
(c) anterior and posterior aorta
(d) right auricle.
Answer:
(b) lungs
Question 44.
Liver secretes:
(a) saliva
(b) gastric juice
(c) bile
(d) pancreatic juice
Answer:
(c) bile
Question 45.
Enzyme amylase acts upon:
(a) fats
(b) proteins
(c) carbohydrates
(d) salts
Answer:
(c) carbohydrates
Question 46.
Muscle contraction of alimentary canal is called:
(a) digestion
(b) peristalsis
(c) circulation
(d) absorption
Answer:
(b) peristalsis
Question 47.
Pure blood is taken to various part of body by:
(a) veins
(b) vena cava
(c) right ventricle
(d) aorta
Answer:
(d) aorta
Question 48.
C shaped structure of alimentary canal is:
(a) stomach
(b) duodenum
(c) oesophagus
(d) vermiform appendix
Answer:
(b) duodenum
Question 49.
The kidneys in human beings are a part of the system for:
(a) nutrition
(b) respiration
(c) excretion
(d) transportation
Answer:
(c) excretion
Question 50.
The xylem in plants are responsible for:
(a) transport of water
(b) transport of food
(c) transport of amino acids
(d) transport of oxygen.
Answer:
(a) transport of water
Question 51.
The number of milk teeth present in humans are:
(a) 20
(b) 24
(c) 28
(d) 32
Answer:
(a) 20
Question 52.
The length of oesophagus in humans is:
(a) 5.8 cm
(b) 25.30 cm
(c) 1.5 metres
(d) 15 feet
Answer:
(b) 25.30 cm
Question 53.
Gastric juice is secreted from:
(a) pancreas
(b) gall bladder
(c) stomach
(d) liver
Answer:
(c) stomach
Question 54.
What does a liver secrete?
(a) Saliva
(b) Gastric juice
(c) Bile juice
(d) Pancreatic juice
Answer:
(c) Bile juice
Question 55.
The energy currency is:
(a) DNA
(b) RNA
(c) ATP
(d) Chlorophyll
Answer:
(c) ATP
Question 56.
The product of alcholic fermentation is:
(a) ethyl alcohol
(b) methyl alcohol
(c) butanol
(d) All of these
Answer:
(a) ethyl alcohol
Question 57.
Dixon and Jolly are associated with:
(a) ascent of sap
(b) osmosis
(c) absorption
(d) diffusion
Answer:
(a) ascent of sap
Question 58.
Soluble only in water is:
(a) Vitamin A
(b) Vitamin D
(c) Vitamin K
(d) Vitamin C
Answer:
(d) Vitamin C
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