Consider the following statements and choose the correct answer:
1. Autophagy is the digestion of endogenous material
2. Heterophagy is the intake of exogenous material into the cell and the subsequent breakdown of this material by enzymes
3. Both pinocytosis and phagocytosis require energy
4. The bulk intake of exogenous material is called exocytosis

Solution (By Examveda Team)

First, let's define some terms:
Autophagy and Heterophagy are types of cellular digestion.
Pinocytosis and Phagocytosis are types of endocytosis, meaning they are ways to bring materials into the cell.
Exocytosis is how cells release materials.
Now let's look at each statement:
1. "Autophagy is the digestion of endogenous material": This is TRUE. "Auto" means "self," so autophagy is like the cell cleaning up its own damaged or unnecessary parts.
2. "Heterophagy is the intake of exogenous material into the cell and the subsequent breakdown of this material by enzymes": This is also TRUE. "Hetero" means "other," so heterophagy is when the cell ingests and digests material from outside itself.
3. "Both pinocytosis and phagocytosis require energy": This is TRUE. These processes involve the cell membrane changing shape to engulf materials, and that requires energy (in the form of ATP).
4. "The bulk intake of exogenous material is called exocytosis": This is FALSE. Exocytosis is the process of releasing material from the cell, not taking it in. Intake is endocytosis.
So, statements 1, 2, and 3 are correct, but statement 4 is wrong.
Therefore, the correct answer is Option B: Only 1, 2 and 3 are correct.