Question

Which cell organelle is the site of respiration within the cell?
A) Nuclear membrane
B) Mitochondria
C) Lysosome
D) Chloroplast

Answer 1

Hint: Respiration is defined as the process of conversion of nutrients into useful energy that helps the cell carry out several metabolic processes and in turn help in the survival and proper functioning of the cell.

Complete answer-
Each cell comprises several organelles which carry out specific functions. Among the four types of organelles given in the options, the nuclear membrane is a double membrane that encloses the nucleus of the cell. It protects the chromosome from the rest of the cell and consists of pores that allow only selective passage of certain substances between the nucleus and the cytoplasm. The mitochondria is also an organelle with double membrane found in most eukaryotic organisms. Mitochondria is the site where cellular respiration takes place resulting in the production of ATP that serves as a source of energy for important metabolic processes. The lysosomes are membrane bound organelles having a pH much lower than the cytoplasm and consists of several lytic enzymes involved in the breakdown of cellular parts as well as destroying pathogenic bacteria and viruses. The chloroplasts are double membrane organelle mostly found in green plants and few other organisms. They help in the process of photosynthesis where energy from sunlight is captured for the production of energy along with the evolution of oxygen.

So the correct option is B) Mitochondria.

Note-
Since the mitochondria is the site of respiration it is important in the survival of the cells. Improper functioning of the mitochondria can lead to several diseases in humans such as autism, heart failure, cardiac dysfunction, etc.