The contraction and expansion movement of the walls of the food pipe is called:

• a) Translocation

• b) transpiration

• c) Peristaltic movement

• d) Digestion

What are the products obtained by anaerobic respiration in plants?

• (a) Lactic acid + energy

• b) Carbon dioxide + water + energy

• (c) Ethanol + carbon dioxide + energy

• d) Pyruvate

The respiratory pigment in human beings is:

• (a) Carotene

• b) chlorophyll

• c ) hemoglobin

• d) mitochondria

The opening and closing of the stomatal pore depend upon:

• a) temperature

• b) Oxygen

• c) water in guard cells

• d) concentration of carbon dioxide

The image shows the transport of gases in the body through the heart and lungs.

Which of the following option shows the transport of oxygen to the cell correctly?

• (a) Lungs →pulmonary vein →left atrium →left ventricle →aorta → body cells

  
  

• (b) Lungs →pulmonary vein →right atrium →right ventricle → aorta → body cells

• (c) Lungs →pulmonary artery →left atrium → left ventricle → vena cava → body cells

• (d) Lungs →pulmonary artery →right atrium → right ventricle→ vena cava → body cells

What is the percentage of oxygen in the expired air when a person is resting?

• (a) 12%

• b) 16%

• c) 20%

• d) 24%

Which of the following is the correct sequence of body parts in the human alimentary canal?

• (a) Mouth → stomach → small intestine → large intestine → oesophagus

• (b) Mouth → oesophagus → stomach → small intestine → large intestine

• (c) Mouth → stomach → oesophagus → small intestine → large intestine

• (d) Mouth → oesophagus → stomach → large intestine → small intestine

Name the acid present in vinegar.

• a) acetic acid

• b) citric acid

• C) oxalic acid

• d) hydrochloric acid

When the right ventricle in the human heart contracts, the blood moves to:

• a) Aorta

• b) brain

• c) lungs

• d) pulmonary artery

Which of the following gases makes the most stable combination with the haemoglobin of red blood cells? 

• A)

  CO2

• b)CO
  

• c) O2​

• d) N2​