Question

Lysosome along with the food content is called as
A) Primary lysosome
B) Secondary lysosome
C) Residual bodies
D) Cytostome

Answer 1

Hint:Lysosomes are membrane bound fluid filled organelles containing various hydrolytic enzymes that can break down many types of biomolecules. They are mainly responsible for the removal of worn out cell organelles and also play a very important role in cell death.

Complete answer:
Let us look at each option one by one.
A) Primary lysosomes are the lysosomal bodies that are freshly formed from the golgi apparatus and contain hydrolytic enzymes for the destruction of any foreign body that might enter the cell. In this state, no food content or other foreign body has entered the lysosome, therefore, this option is incorrect.
B) Secondary lysosomes are the lysosomal bodies which contain various hydrolytic enzymes as well as the phagosomes i.e. the foreign bodies entering the cell encapsulated by a part of the cell membrane. Phagosomes also include any particles the cell might have ingested as food. Therefore, this is the correct option.
C) Residual bodies are the indigestible materials in lysosomal digestion that remain as vesicles or as lipofuscin bodies indefinitely in the cell cytosol. Since these bodies do not contain any digestible materials, therefore, this option is incorrect.
D)Cytostome is a part of the specialized for the phagocytosis of food in certain protozoan organisms. On phagocytosis, these cytosomes form vacuoles that aid in digestion of the food. These vacuoles are different from lysosomes. Therefore, this option is incorrect.

Thus, the correct answer is option (B) Secondary lysosomes.

Note:Apart from the digestion of food, lysosomes are also responsible for the protection of the cell and other cells surrounding it from infection. In cases of infection, the lysosome starts devouring all the other cell organelles and increases in size causing it to burst. This releases the hydrolytic enzymes contained within to spill into the cytoplasm and rupture the cell, preventing nearby cells from getting infected.