Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Arteries are best defined as the vessels which

  • Carry blood away from the heart to different organs

  • Break up into capillaries which reunite to form a vein

  • Carry blood from one visceral organ to another visceral organ

  • Carry blood from one visceral organ to another visceral organ


C.

Carry blood from one visceral organ to another visceral organ

Arteries are blood vessels that carry blood away from the heart toward different organs. They generally contain oxygenated blood (except pulmonary artery which contains deoxygenated blood). The blood flows in an artery under alternate increased pressure and with jerks.

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2.

The Eyes of the potato tuber are

  • flower buds

  • shoot buds

  • axillary buds

  • axillary buds


C.

axillary buds

Tuber is oval or spherical swollen underground modified stem lacking adventitious roots. It possesses a number of spirally arranged depressions called eyes. Each eye represents node and consists of 1-3 axillary buds in the axils of small scally leaves.

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3.

'Bundle of His' is a part of which one of the following organs in humans?

  • Heart

  • Kidney

  • Pancreas

  • Pancreas


A.

Heart

The bundle of his known as AV bundle (atrio ventricular bundle) is a collection of heart muscles cells specialised for electrical conduction. These specialised muscle fibres in cardiologist wilhelm His, Jr., Who discovered them in 1893.

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4.

The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function.

  • A: Alveolar cavity - main site of exchange of respiratory gases

  • D: Capillary wall - exchange of O2 and CO2 takes place here

  • B : Red blood cell - transport of CO2 mainly

  • B : Red blood cell - transport of CO2 mainly


A.

A: Alveolar cavity - main site of exchange of respiratory gases

Alveoli are the primary sites of exchange of gases. The exchange of gases (O2 and CO2) between the alveoli and the blood occurs by simple diffusion. 

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5.

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of

  • Diaphragm

  • Neck

  • Tongue

  • Tongue


D.

Tongue

The epiglottis is a flap that is made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx. It prevents the entry of food into the larynx, and directs it to the oesophagus. Due to improper movement of epiglottis, one may suddenly start coughing while swallowing some food.

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6.

Which one of the following statements is correct regarding blood pressure?

  • 100/55 mmHg is considered an ideal blood pressure

  • 105/50 mmHg makes one very active

  • 190/110 mmHg may harm vital organs like brain and kidney

  • 190/110 mmHg may harm vital organs like brain and kidney


C.

190/110 mmHg may harm vital organs like brain and kidney

Hypertension is the term for blood pressure that is higher than normal (120/80). In this measurement, 120 mm Hg (millimeter of mercury pressure) is the systolic, or pumping, pressure and 80 mm Hg is the diastolic, or resting pressure. If repeated checks of blood pressure 190/100 mm Hg) of an individual is 140/90 (140 over 90) or higher, it shows hypertension. High blood pressure (190/100 mm Hg) leads to heart diseases and also affects vital organs like brain and kidney. 

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7.

The function of leghemoglobin in the root nodules of legumes is 

  • oxygen removal 

  • nodule differentiation

  • expression of nif gene

  • expression of nif gene


A.

oxygen removal 

Leghaemoglobin is an oxygen scavenger. It protects the nitrogen-fixing enzyme nitrogenase. 

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8.

The ciliated columnar epithelial cells in humans are known to occur in

  • bronchioles and fallopian tubes

  • bile duct and oesophagus

  • fallopian  tubes and urethra

  • fallopian  tubes and urethra


A.

bronchioles and fallopian tubes

The columnar epithelium is composed of a single layer of tall and slender cells. If the columnar cells bear cilia on their free surface they are called ciliated columnar epithelium. They are mainly present in the inner surface of hollow organs like bronchioles and fallopian tubes. Their function is to move particles or mucus in a specific direction over the epithelium.

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9.

CAM helps the plants in

  • secondary growth

  • disease resistance

  • reproduction

  • reproduction


D.

reproduction

CAM plants are mostly succulent xerophytes. The stomata in these plants remain closed during the day. This helps to check the transpiration. In this way, water is conserved.

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10.

Match the source gland with its respective hormone as well as the function.

  • Source gland Hormone Function
    Posterior pituitary Vasopressin Stimulates resorption of water in the distal tubules in the nephron

  • Source gland Hormone Function
    Corpus luteum Oestrogen Supports pregnancy

  • Source gland Hormone Function
    Thyroid Thyroxine Regulates blood calcium level

  • Source gland Hormone Function
    Thyroid Thyroxine Regulates blood calcium level


A.

Source gland Hormone Function
Posterior pituitary Vasopressin Stimulates resorption of water in the distal tubules in the nephron

The pituitary gland is located in a bony cavity called sella tursica and is attached to hypothalamus by a stalk. It is divided anatomically into an adenohypophysis and a neurohypophysis. The latter is also called pars nervosa or posterior pituitary. It stores and releases two hormone called oxytocin and vasopressin, which are actually synthesized by the hypothalamus and are transported axonally to neurohypophysis. Vasopressin acts mainly at the kidney and stimulates resorption of water and electrolytes by the distal tubules in the nephron and thereby reduces loss of water through urine (diuresis). Hence, it is also called as anti-diuretic hormone (ADH).

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