Hemoglobin and chlorophyll have similar structures. 
- A molecule of hemoglobin is composed of the atoms of four elements-carbon, hydrogens, oxygen, and nitrogen, all four organised around iron. 
- A chlorophyll is composed of the same elements which are organised around magnesium.

 Considering the above information, which element of hemoglobin is MOST LIKELY responsible for the red colour of our blood?

Many processes happen in the bodies of living organisms. 
Those processes which involve the building up of complex molecules from simple ones are called anabolism. Those which involved the breakdown of complex molecules into simple ones are called catabolism. 

Which of the following life processes can be considered as an example of anabolism?

Given below is a diagram of a nephron.

Which of the following option correctly shows where filtration and selective reabsorption occur?

Read the following two statements and answer the question. 
Gatroparesis is a disease in which the muscles of the stomach become paralysed and cannot contract or relax. 
Foods high in fat can delay the process of digestion and the emptying of the stomach. 

Which of the following food would be advised to a patient suffering from Gastroparesis?

Which row of the table given below correctly gives the movement of gases across the blood and cells.

Read the following statements.

X: Amount of carbon dioxide produced per molecule of glucose during aerobic respiration.

Y: Amount of carbon dioxide produced per molecule of glucose during fermentation by yeast.

Which of the following is true about X and Y?

There are various muscles present in the human digestive system known as sphincters. Two examples of those are given below:

1. Pyloric sphincter- at the junction of the stomach and small intestine.

2. Anal sphincter- at the anus.

Give ONE most likely consequence of malfunctioning of each of these sphincters?