Download PDF
Free download in PDF Life Processes Multiple Choice Questions & Answers for competitive exams. These short objective type questions with answers are very important for competitive exams as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
(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: They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(2)
Which is the correct sequence of parts in human alimentary canal?
[A]
Mouth → Stomach → Small intestine → Oesophagus → Large intestine
[B]
Mouth → Oesophagus → Stomach → Large intestine → Small intestine
[C]
Mouth → Stomach → Oesophagus → Small intestine → Large intestine
[D]
Mouth → Oesophagus → Stomach → Small intestine → Large intestine
Answer: Mouth → Oesophagus → Stomach → Small intestine → Large intestine
(3)
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
(4)
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
(5)
Which of the following statements (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 form alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen
(iv) Alveoli increases surface area for exchange of gases
[A]
(i) and (iv)
[B]
(ii) and (iii)
[C]
(i) and (iii)
[D]
(ii) and (iv)
(6)
Which of the following statement (s) is (are) true about heart?
(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs
(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs
(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts
(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body
[A]
(i)
[B]
(ii)
[C]
(ii) and (iv)
[D]
(i) and (iii)
(7)
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 these
(8)
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 under low pressure and carry blood away from the heart to various organs 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 flows under high pressure and carry blood away from the heart to different parts of the body
Answer: They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body
(9)
Oxygen liberated during photosynthesis comes from
[A]
Water
[B]
Chlorophyll
[C]
Carbon dioxide
[D]
Glucose
(10)
The blood leaving the tissues becomes richer in
[A]
Carbon dioxide
[B]
Water
[C]
Heamoglobin
[D]
Oxygen
(11)
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: Movement of molecules does not take place among cells
(12)
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: 6CO2 + 12H2O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2O
(13)
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: water in guard cells
(14)
Which is the first enzyme to mix with food in the digestive tract?
[A]
Pepsin
[B]
Cellulase
[C]
Amylase
[D]
Trypsin
(15)
Lack of oxygen in muscles often leads to cramps among cricketers. This result 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: Conversion of pyruvate to lactic acid
(16)
During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the
[A]
Cytoplasm
[B]
Chloroplast
[C]
Mitochondria
[D]
Golgi body
(17)
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: Kidney → Ureters → Urinary bladder → Urethra
(18)
Which of the following statements (s) is (are) correct?
(i) Pyruvate can be converted into ethanol and carbon dioxide by 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)
(19)
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]
None of these
(20)
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: Oxidation of carbon to carbon dioxide
Take Mock Tests