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

View Answer

Answer: Dialysis

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Thyroxine

76 The number of pairs of nerves which arises from the spinal cord is:

A 31

B 51

C 21

D 41

View Answer

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

View Answer

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

View Answer