Biological check post also called as casparian strips are made up of waxy suberin and it occurs in

Options

A. cortex
B. pericycle
C. epidermis
D. endodermis

Explanation

To solve the question regarding where the biological check post, also known as Casparian strips, occurs in plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Casparian Strips**:
- Casparian strips are specialized structures in plant roots that act as a barrier to the passive flow of substances into the vascular system of the plant. They ensure that all substances entering the vascular tissues must pass through the cell membranes, allowing for selective absorption.

**Hint**: Remember that Casparian strips control what enters the plant's vascular system.
...