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CBSE Class 10 Science Quiz | CBSE Class 10 Science Multiple Choice Questions(MCQs) with Answers

61 The excretory unit of the human excretory system is known as:
[A] Nephron
[B] kidneys
[C] Neuron
[D] Nephridia
Answer: Nephron
62 Which among the following procedures is used for cleaning the blood of a person by separating the waste substance from it?
[A] Dialysis
[B] Hydrolysis
[C] Kidney transplant
[D] Blood transfusion
Answer: Dialysis

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63 The process of diffusion of solvent particles from the region of less solute concentration to a region of high solute concentration through semi-permeable membrane is known as
[A] Osmosis
[B] Transpiration
[C] Diffusion
[D] Translocation
Answer: Osmosis
64 Movement of the synthesized products from the leaves to the roots and other parts of a plant’s body takes place through the phloem. This process is known as:
[A] Excretion
[B] Translocation
[C] Transportation
[D] Transpiration
Answer: Translocation
65 The vein which brings clean blood from the lungs into the heart is known as:
[A] Pulmonary artery
[B] Superior vena cava
[C] Pulmonary vein
[D] Hepatic vein
Answer: Pulmonary vein
66 Which of the following help in protecting the inner lining of the stomach from the harmful effect of hydrochloric acid?
[A] Bile
[B] Mucus
[C] Pepsin
[D] Trypsin
Answer: Mucus
67 The enzymes contained in pancreatic juices help in the digestion of:
[A] Proteins, fats and carbohydrates
[B] Proteins and carbohydrates
[C] Fats and carbohydrates
[D] Proteins and fats
Answer: Proteins, fats and carbohydrates
68 Among the following choose the correct option which includes the organisms that have a holozoic mode of nutrition:
[A] Parakeet and Amoeba
[B] Paramecium and Parasite
[C] Plasmodium and Amoeba
[D] Paramecium and Plasmodium
Answer: Parakeet and Amoeba
69 The enzymes pepsin and trypsin are secreted respectively by
[A] Liver and salivary gland
[B] Stomach and pancreas
[C] Salivary gland and stomach
[D] Liver and pancreas
Answer: Stomach and pancreas
70 Electrical impulse travels in a neuron from:
[A] Dendrite → cell body → axon → axon end
[B] Axon end →axon → cell body → dendrite
[C] Dendrite → axon → axon end → cell body
[D] Cell body → dendrite → axon → axon end
Answer: Dendrite → cell body → axon → axon end
71 The dramatic changes in body features associated with puberty are mainly because of the secretions of:
[A] Testosterone from thyroid gland and estrogen from pituitary gland
[B] Testosterone from testes and estrogen from ovary
[C] Estrogen from testes and testosterone from ovary
[D] Estrogen from adrenal gland and testosterone from pituitary gland
Answer: Testosterone from testes and estrogen from ovary
72 A doctor advised a person to take injection of insulin because his:
[A] Blood sugar was high
[B] Thyroxine level in blood was high
[C] Blood pressure was high
[D] Heart beat was high
Answer: Blood sugar was high
73 Which of the following control and regulate the life process?
[A] Nervous and endocrine systems
[B] Endocrine and digestive systems
[C] Reproductive and endocrine systems
[D] Respiratory and nervous systems
Answer: Nervous and endocrine systems
74 Which of the following controls the involuntary actions in the body?
[A] Medulla in hindbrain
[B] Medulla in midbrain
[C] Medulla in forebrain
[D] Medulla in spinal cord
Answer: Medulla in hindbrain
75 Iodine is necessary for the synthesis of which of the following hormone?
[A] Thyroxine
[B] Insulin
[C] Adrenaline
[D] Auxin
Answer: Thyroxine
76 The number of pairs of nerves which arises from the spinal cord is:
[A] 31
[B] 51
[C] 21
[D] 41
Answer: 31
77 Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
[A] Photonasty
[B] Chemotropism
[C] Phototropism
[D] Thigmonasty
Answer: Photonasty
78 A growing seedling is kept in a dark room. A burning lamp is placed near to it for a few days. The top part of seedling bends towards the burning candle. This is an example of:
[A] Phototropism
[B] Geotropism
[C] Chemotropism
[D] Hydrotropism
Answer: Phototropism
79 The stimulus in the process of thigmotropism is:
[A] Chemical
[B] Gravity
[C] Touch
[D] Light
Answer: Touch
80 The growth of tendrils in pea plants is due to the:
[A] Rapid cell division and elongation in tendril cells that are away from the support
[B] Rapid cell division and elongation in tendril cells in contact with the support
[C] Effect of gravity on the part of tendril hanging down towards the earth
[D] Effect of sunlight on the tendril cells facing the sun
Answer: Rapid cell division and elongation in tendril cells that are away from the support

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