Life Processes Class-10 Biology MCQ Previous Year Questions
Q.1) Opening of stomata is regulated by :
(A) Entry of water into guard cells
(B) Exit of water from guard cells
(C) Entry of air into the stomatal pore
(D) Entry of water into the stomatal pore
(A) Entry of water into guard cells
Q.2) Identify the part that controls the closing and opening of the stomatal pore in leaves of plants. Select the correct option.
(A) Stomata (B) Epidermal cells (C) Guard cells (D) Chloroplasts
(C) Guard cells
Q.3) Four chambered heart is a characteristic of :
(A) Fishes (B) Amphibians (C) Reptiles (D) Mammals
(D) Mammals
Q.4) The carbohydrates, which are not used immediately in plants, are stored in the form of ‘a’, which serves as an internal energy reserve. What does ‘a’ stand for ?
(A) Starch
(B) Sugar
(C) Fat
(D) Protein
(A) Starch
Q.5) Pravin was given a list of characteristics associated with the process of anaerobic respiration in humans, in the table given below :
Which of the above characteristics is/are related to the above process ?
(A) (i) and (ii)
(B) (i) and (iii)
(C) (ii) and (iii)
(D) (i) only
(B) (i) and (iii)
Q.6) Observe the figure given below and identify the incorrect step for the activity set-up :
(A) Both plants are kept in the dark room for three days before placing them in separate glass jars.
(B) Both plants are covered with separate wooden bell-jars.
(C) Use vaseline to seal the bottom of the jars with the glass plates.
(D) Both potted plants were kept in sunlight for a few hours before the iodine test for the presence of starch.
(B) Both plants are covered with separate wooden bell-jars.
Q.7) The following events occur during the process of photosynthesis. Choose the option that indicates the correct events.
(i) Oxidation of carbon dioxide to carbohydrates
(ii) Conversion of light energy into chemical energy
(iii) Absorption of light energy by chlorophyll
(iv) Conversion of hydrogen and oxygen into water
Options :
(A) (i) and (ii)
(B) (ii) and (iii)
(C) (iii) and (iv)
(D) (i) and (iv)
(B) (ii) and (iii)
Q.8) Select the option that represents the correct balanced equation for the process of photosynthesis :
(A) 
(B) 
(C) 
(D) 
(D)
Q.9) If the stomatal pore is open, it indicates which situation from the following ?
(A) The guard cells have shrunk.
(B) The water comes out of the guard cells.
(C) Large amount of water is lost through stomata.
(D) The guard cells have swelled due to inflow of water.
(D) The guard cells have swelled due to inflow of water.
Q.10) Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.
(A) By eating the bread on which it is growing.
(B) By using nutrients from the bread to prepare their own food.
(C) By breaking down the nutrients of bread outside the body and then absorbing them.
(D) By allowing other organisms to grow on the bread and then consuming them.
(C) By breaking down the nutrients of bread outside the body and then absorbing them.
Q.11) In human beings the oxygen rich blood is pumped out to the body by :
(A) contraction of right atrium
(B) relaxation of left ventricle
(C) contraction of right ventricle
(D) contraction of left ventricle
(D) contraction of left ventricle
Q.12) Choose the equation of reaction that correctly represents anaerobic respiration in muscles :
(A) 
(B) 
(C) 
(D) 
(D)
Q.13) Pancreas secretes pancreatic juice which contain enzyme that helps in digestion of food.
Choose the correct option from the following:
(A) Trypsin digests emulsified fats and lipase digests proteins.
(B) Trypsin digests proteins and lipase digests emulsified fats.
(C) Trypsin and lipase both digests’ fats.
(D) Trypsin digests proteins and lipase digests carbohydrates.
(B) Trypsin digests proteins and lipase digests emulsified fats.
Q.14) Which structure in a leaf is mainly responsible for gaseous exchange?
(A) Xylem
(B) Stomata
(C) Phloem
(D) Cuticle
(B) Stomata
Q.1) Which one of the following is not an excretory product in plants ?
(A) CO2
(B) Starch
(C) Resins and gums
(D) Dead cells
(B) Starch
Q.2) The basic filtration unit of the excretory system in human beings is :
(A) Nephron
(B) Urethra
(C) Neuron
(D) Urinary bladder
(A) Nephron
Q.3) In human alimentary canal, the digestive juice secreted by the gastric glands are
(A) Bile, Trypsin, Pepsin
(B) Hydrochloric acid, Pepsin, Mucus
(C) Lipase, Bile, Mucus
(D) Salivary amylase, Pepsin, Bile
(B) Hydrochloric acid, Pepsin, Mucus
Q.4) Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps :
(i) Diffusion of simple nutrients into cytoplasm
(ii) Food vacuole formation
(iii) Formation of finger like temporary extensions of cell surface
(iv) Complex substances broken to simpler ones
(v) Undigested material thrown out of the cell surface
Options:
(A) (iv), (i), (ii), (iii), (v)
(B) (iii), (ii), (iv), (i), (v)
(C) (ii), (i), (iv), (v), (iii)
(D) (iii), (iv), (i), (ii), (v)
(B) (iii), (ii), (iv), (i), (v)
Q.5) In aerobic respiration, the steps are : breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both processes respectively occur in —
(A) Vacuole and Cytoplasm
(B) Chloroplast and Mitochondria
(C) Mitochondria and Cytoplasm
(D) Cytoplasm and Mitochondria
(D) Cytoplasm and Mitochondria
Q.6) Select TRUE statements about lymph from the following:
A. Lymph vessels carry lymph through the body and finally open into larger arteries.
B. Lymph contains some amount of plasma, proteins and blood cells.
C. Lymph contains some amount of plasma, proteins and red blood cells.
D. Lymph vessels carry lymph through the body and finally open into larger veins.
The true statements are :
(a) A and B
(b) B and D
(c) A and C
(d) C and D
(b) B and D
Q.7) Parasitic mode of nutrition is observed in :
(A) Bryophyllum (B) Hibiscus (C) Cuscuta (D) Helianthus
(C) Cuscuta
Q.8) Temporary finger-like extensions on the cell surface to take in food is formed in :
(A) Paramoecium (B) Amoeba (C) Leishmania (D) Rhizopus
(B) Amoeba
Q.9) The gastric glands present in the wall of the stomach release :
(A) Mucus and Trypsin
(B) Pepsin and Trypsin
(C) Mucus and Pepsin
(D) Pepsin and Salivary amylase
(C) Mucus and Pepsin
Q.10) Select the correct option from the following statements about the functioning of the human heart.
(A) Right atrium receives deoxygenated blood from different parts of the body and sends it to pulmonary veins.
(B) Left atrium sends oxygenated blood to right ventricle which pumps it to different parts of the body.
(C) Right atrium receives deoxygenated blood from the body and sends it to the right ventricle.
(D) Left atrium receives oxygenated blood from the pulmonary arteries and sends it to the left ventricle.
(C) Right atrium receives deoxygenated blood from the body and sends it to the right ventricle.
Q.11) The opening and closing of stomata is regulated by :
(A) CO2 concentration in stomata
(B) Temperature in guard cells
(C) O2 concentration in stomata
(D) Amount of water in guard cells
(D) Amount of water in guard cells
Q.12) One-cell thick blood vessels are known as :
(A) Alveoli (B) Capillaries (C) Arteries (D) Veins
(B) Capillaries
Q.13) Secretion of less saliva in mouth will effect the conversion of :
(A) proteins into amino acids
(B) fats into fatty acids and glycerol
(C) starch into simple sugars
(D) sugars into alcohol
(C) starch into simple sugars
Q.14) The breakdown of glucose has taken the following pathway :
The sites ‘a’ and ‘b’ respectively are :
(A) Mitochondria and Oxygen deficient muscle cells
(B) Cytoplasm and Oxygen rich muscle cells
(C) Cytoplasm and Yeast cells
(D) Cytoplasm and Oxygen deficient muscle cells
(D) Cytoplasm and Oxygen deficient muscle cells
Q.15) The valves in the human heart ensure that :
(i) Oxygen-rich blood flows from left atrium to left ventricle only.
(ii) Deoxygenated blood flows from left atrium to left ventricle only.
(iii) Oxygen-rich blood flows from right atrium to right ventricle only.
(iv) Deoxygenated blood flows from right atrium to right ventricle only.
(A) (i) and (iii) (B) (ii) and (iv)
(C) (i) and (iv) (D) (ii) and (iii)
(C) (i) and (iv)
Q.16) Breakdown of proteins in the stomach takes place by the enzyme :
(A) Trypsin (B) Lipase (C) Salivary Amylase (D) Pepsin
(D) Pepsin
Q.1) The opening and closing of stomatal pore depends upon :
(A) temperature
(B) excess of CO2 in the guard cells
(C) high concentration of oxygen in the guard cells
(D) flow of water in and out of the guard cells
(D) flow of water in and out of the guard cells
Q.2) In plants, waste products like resins and gums are stored in :
(A) leaves that fall off
(B) old xylem
(C) phloem
(D) cellular vacuoles
(B) old xylem
Q.3) In the human respiratory system, the path taken by air when we breathe in is :
(A) Nostrils → Larynx → Trachea → Pharynx → Alveoli
(B) Nostrils → Trachea → Larynx → Pharynx → Alveoli
(C) Nostrils → Pharynx → Larynx → Trachea → Alveoli
(D) Nostrils → Larynx → Pharynx → Trachea → Alveoli
(C) Nostrils → Pharynx → Larynx → Trachea → Alveoli
Q.4) The process in which transport of soluble products of photosynthesis takes place in plants is known as :
(A) Transpiration
(B) Evaporation
(C) Conduction
(D) Translocation
(D) Translocation
Q.5) In human beings, when the process of digestion is completed, the (i) proteins, (ii) carbohydrates, and (iii) fats are respectively finally converted into :
(A) (i) Amino acids, (ii) glucose and (iii) fatty acids
(B) (i) Amino acids, (ii) glucose, (iii) fatty acids and glycerol
(C) (i) Glucose, (ii) fatty acids and glycerol, (iii) amino acids
(D) (i) Sugars, (ii) amino acids, (iii) fatty acids and glycerol
(B) (i) Amino acids, (ii) glucose, (iii) fatty acids and glycerol
Q.6) In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :
(A) lifted ribs and curve/dome shaped diaphragm.
(B) lifted ribs and flattened diaphragm.
(C) relaxed ribs and flattened diaphragm.
(D) relaxed ribs and curve/dome shaped diaphragm.
(B) lifted ribs and flattened diaphragm.
Q.7) Which of the following statement(s) is (are) true about human heart ?
(a) Right atrium receives oxygenated blood from lungs through pulmonary artery.
(b) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.
(c) Right atrium receives deoxygenated blood through vena cava from upper and lower body.
(d) Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body.
Options
(A) (a)
(B) (a) and (d)
(C) (b) and (c)
(D) (b) and (d)
(C) (b) and (c)
Q.8) A stomata closes when :
(i) it needs carbon dioxide for photosynthesis.
(ii) it does not need carbon dioxide for photosynthesis.
(iii) water flows out of the guard cells.
(iv) water flows into the guard cells.
The correct reason(s) in this process is/are :
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
(c) (ii) and (iii)
Q.1) As compared to daytime, the amount of carbon dioxide released by the plants during night is more because :
(a) It is not produced during daytime.
(b) It is stored in the leaves of plants during daytime.
(c) Major amount of carbon dioxide produced is used up for photosynthesis during daytime.
(d) Plants do not respire during daytime.
(c) Major amount of carbon dioxide produced is used up for photosynthesis during daytime.
Q.2) Which one of the following molecules is produced initially when glucose breaks down in the cytoplasm of a cell in aerobic as well as anaerobic respiration ?
(a) Lactic acid
(b) Ethanol
(c) Carbon dioxide
(d) Pyruvate
(d) Pyruvate
Q.3) Water in the root enters due to :
(a) the function of the root to absorb water.
(b) difference in the concentration of ions between the root and the soil.
(c) excess water present in the soil.
(d) diffusion of water in the roots.
(b) difference in the concentration of ions between the root and the soil.
Q.4) Opening and closing of stomata is due to :
(a) High pressure of gases inside the cells.
(b) Movement of water in and out of the guard cells.
(c) Stimulus of light in the guard cells.
(d) Diffusion of CO2 in and out of the guard cells.
(b) Movement of water in and out of the guard cells.
Q.5) As compared to terrestrial organisms, the rate of breathing in aquatic organisms is :
(a) faster because they need more oxygen for their survival.
(b) faster because the amount of dissolved oxygen in water is fairly low.
(c) slower because the amount of dissolved oxygen in water is fairly low.
(d) slower because the capacity of water of dissolving atmospheric air is limited.
(b) faster because the amount of dissolved oxygen in water is fairly low.
Q.6) The process in which loss of water in the form of vapours from the aerial parts of plants takes place is X, which helps in Y. Here X and Y respectively are :
(a) transpiration and photosynthesis.
(b) transpiration and temperature regulation.
(c) translocation and movement of soluble products of photosynthesis in phloem.
(d) translocation and absorption of water and minerals from soil by roots.
(b) transpiration and temperature regulation.
Q.7) The part in which gustatory receptors are present in our body is :
(a) inner ear
(b) skin
(c) tongue
(d) inner lining of nose
(c) tongue
Q.8) One of the events that does not occur during photosynthesis is :
(a) Chlorophyll absorbs solar energy.
(b) Carbon dioxide is released during the process.
(c) Oxygen is released during the process.
(d) Carbon dioxide is absorbed during the process.
(b) Carbon dioxide is released during the process.
Q.9) Observe the following diagram and identify the process and its significance from the following options :
(a) Evaporation : maintains water contents in leaf cells.
(b) Transpiration : creates a suction force which pulls water inside the plant.
(c) Excretion : helps in excreting out waste water from the plant.
(d) Translocation : helps in transporting materials from one cell to another.
(b) Transpiration : creates a suction force which pulls water inside the plant.
Q.10) Sphincter muscles are present at the exit of :
(a) Stomach and small intestine
(b) Stomach and anus
(c) Small intestine and large intestine
(d) Oesophagus and stomach
(b) Stomach and anus
Q.11) During vigorous exercise, the occurrence of cramps in the outer muscles of an athlete is due to the conversion of pyruvate to :
(a) Glucose
(b) Ethanol
(c) Lactic acid
(d) Lactose
(c) Lactic acid
Q.12) In the following diagram, identify the cells through which massive amounts of gaseous exchange takes place for photosynthesis :
(a) I
(b) IV
(c) III
(d) II
(b) IV
Q.13) An organism which breaks down the food material outside the body and then absorbs it is
(a) a plant parasite, Cuscuta.
(b) an animal parasite, Tapeworm.
(c) a bacteria, Rhizobium.
(d) a fungi, Rhizopus.
(d) a fungi, Rhizopus.
Q.14) Consider the following statements about small intestine and select the one which is NOT correct :
(a) The length of the small intestine in animals differs as it depends on the type of food they eat.
(b) The small intestine is the site of complete digestion of food.
(c) The small intestine receives secretions from liver and pancreas.
(d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
(d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
Q.15) In the given diagram of a closed stomata : (1), (2), (3) and (4) respectively are
(a) nucleus, chloroplast, guard cell, vacuole
(b) nucleus, chloroplast,, vacuole, guard cell
(c) chloroplast, nucleus, vacuole, guard cell
(d) vacuole, guard cell, nucleus, chloroplast
(b) nucleus, chloroplast, vacuole, guard cell
Q.1) No MCQs in the question paper.
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