Life Processes


If by an unknown accident the acid secreting cells of the stomach wall of an individual are damaged. Digestion of which one of the following biomolecule will be affected to a greater extent?

  1. Protein only
  2. Lipid
  3. Carbohydrate only
  4. Protein and Carbohydrate
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Which one of the following parts of body does not take part in the process of breathing?

  1. Bronchi
  2. Bowman’s capsule
  3. Diaphragm
  4. Trachea
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In artificial insemination (AI) process, which of the following is/are introduced into the uterus of the female?

  1. Egg only
  2. Fertilized egg
  3. Sperm only
  4. Egg and sperm
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The main thinking part of the brain is

  1. hypothalamus
  2. midbrain
  3. hindbrain
  4. forebrain
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Which one of the following is not a function of liver?

  1. Production of urea
  2. Absorption of food and excess water from the undigested food
  3. Destruction of dead and worn-out red blood cells
  4. Conversion of glucose into glycogen
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Which of the statements given below are correct?

  1. A person having blood group 'A' can donate blood to persons having blood group 'A' and blood group 'AB'.
  2. A person having blood group 'AB' can donate blood to persons having blood groups 'A', 'B', 'AB' or 'O'.
  3. A person with blood group 'O' can donate blood to persons having any blood group.
  4. A person with blood group 'O' can receive blood from the person of any of the blood groups.

Select the correct answer using the code given below:

  1. 1 and 3 only
  2. 3 and 4 only
  3. 1 and 2 only
  4. 1, 2, 3 and 4
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The gastrointestinal hormones namely secretin and cholecystokinin secreted by duodenal epithelium activate respectively which organs to discharge their secretions?

  1. stomach and small intestine
  2. gall bladder and stomach
  3. pancreas and gall bladder
  4. pancreas and stomach
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The growth of pollen tubes towards ovules is due to

  1. hydrotropism
  2. chemotropism
  3. geotropism
  4. phototropism
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The growth of tendril in pea plants is due to

  1. effect of light
  2. effect of gravity
  3. rapid cell divisions in tendrillar cells that are away from the support
  4. rapid cell divisions in tendrillar cells in contact with the support
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The shape of guard cells changes due to change in the

  1. protein composition of cells
  2. temperature of cells
  3. amount of water in cells
  4. position of nucleus in the cells
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Iodine is necessary for the synthesis of which hormone?

  1. Adrenaline
  2. Thyroxin
  3. Auxin
  4. Insulin
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The main function of abscisic acid in plants is to

  1. increase the length of cells
  2. promote cell division
  3. inhibit growth
  4. promote growth of stem
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The movement of shoot towards light is

  1. geotropism
  2. hydrotropism
  3. chemotropism
  4. phototropism
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Spinal cord originates from

  1. cerebrum
  2. medulla
  3. pons
  4. cerebellum
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Posture and balance of the body is controlled by

  1. cerebrum
  2. cerebellum
  3. medulla
  4. pons
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Which is the correct sequence of the components of a reflex arc?

  1. Receptors→ Muscles→ Sensory neuron→ Motor neuron→ Spinal cord
  2. Receptors→ Motor neuron → Spinal cord → Sensory neuron → Muscle
  3. Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
  4. Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle
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In a neuron, conversion of electrical signal to a chemical signal occurs at/in

  1. cell body
  2. axonal end
  3. dendritic end
  4. axon
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In a synapse, chemical signal is transmitted from

  1. dendritic end of one neuron to axonal end of another neuron
  2. axon to cell body of the same neuron
  3. cell body to axonal end of the same neuron
  4. axonal end of one neuron to dendritic end of another neuron
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Electrical impulse travels in a neuron from

  1. Dendrite → axon → axonal end → cell body
  2. Cell body → dendrite → axon → axonal end
  3. Dendrite → cell body → axon → axonal end
  4. Axonal end → axon → cell body → dendrite
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Choose the correct path of urine in our body

  1. kidney → ureter → urethra → urinary bladder
  2. kidney → urinary bladder → urethra → ureter
  3. kidney → ureters → urinary bladder → urethra
  4. urinary bladder → kidney → ureter → urethra
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Which is the first enzyme to mix with food in the digestive tract?

  1. Pepsin
  2. Cellulase
  3. Amylase
  4. Trypsin
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The opening and closing of the stomatal pore depends upon

  1. oxygen
  2. temperature
  3. water in guard cells
  4. concentration of CO2 in stomata
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The blood leaving the tissues becomes richer in

  1. carbon dioxide
  2. water
  3. heamoglobin
  4. oxygen
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The filtration units of kidneys are called

  1. ureter
  2. urethra
  3. neurons
  4. nephrons
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What prevents backflow of blood inside the heart during contraction?

  1. Valves in heart
  2. Thick muscular walls of ventricles
  3. Thin walls of atria
  4. All of the above
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During respiration exchange of gases take place in

  1. trachea and larynx
  2. alveoli of lungs
  3. alveoli and throat
  4. throat and larynx
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Which is the correct sequence of air passage during inhalation?

  1. Nostrils → larynx → pharynx → trachea → lungs
  2. Nasal passage → trachea → pharynx → larynx → alveoli
  3. larynx → nostrils → pharynx → lungs
  4. Nostrils → pharynx → larynx → trachea → alveoli
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In which part of the alimentary canal food is finally digested?

  1. Stomach
  2. Mouth cavity
  3. Large intestine
  4. Small intestine
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Which part of alimentary canal receives bile from the liver?

  1. Stomach
  2. Small intestine
  3. Large intestine
  4. Oesophagus
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The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

  1. Pepsin
  2. Mucus
  3. Salivary amylase
  4. Bile
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In which of the following groups of organisms, food material is broken down outside the body and absorbed?

  1. Mushroom, green plants, Amoeba
  2. Yeast, mushroom, bread mould
  3. Paramecium, Amoeba, Cuscuta
  4. Cuscuta, lice, tapeworm
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Which is the correct sequence of parts in human alimentary canal?

  1. Mouth → stomach → small intestine → oesophagus → large intestine
  2. Mouth → oesophagus → stomach → large intestine → small intestine
  3. Mouth → stomach → oesophagus → small intestine → large intestine
  4. Mouth → oesophagus → stomach → small intestine → large intestine
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Aquatic animals like fish excrete their wastes in gaseous form as

  1. Oxygen
  2. Hydrogen
  3. Ammonia
  4. Nitrogen
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In which of the following parts of human body are sweat glands absent?

  1. Scalp
  2. Armpits
  3. Lips
  4. Palms
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The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in

  1. veins
  2. arteries
  3. heart
  4. capillaries
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During the process of exhalation, the ribs move

  1. down and inwards
  2. up and inwards
  3. down and outwards
  4. up and outward
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Yeast is used in wine and beer industries because it respires

  1. aerobically producing oxygen
  2. aerobically producing alcohol
  3. anaerobically producing alcohol
  4. anaerobically producing CO2
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The enzymes present in the saliva convert

  1. fats into fatty acids and glycerol.
  2. starch into simple sugars.
  3. proteins into amino acids.
  4. complex sugars into simple sugars.
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The acid present in the stomach

  1. kills the harmful bacteria that may enter along with the food.
  2. protects the stomach lining from harmful substances.
  3. digests starch into simpler sugars.
  4. makes the medium alkaline.
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The swallowed food moves downwards in the alimentary canal because of

  1. force provided by the muscular tongue.
  2. the flow of water taken with the food.
  3. gravitational pull.
  4. the contraction of muscles in the wall of food pipe.
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Which of the following joints is immovable?

  1. Shoulder and arm
  2. Knee and joint
  3. Upper jaw and skull
  4. Lower jaw and upper jaw
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