Below are given a few cell organelles :
(a) Nucleus
(b) Lysosomes
(c) Peroxisomes
(d) ER
(e) Mitochondria
(f) Centrioles
(g) Plastids
Select the correct choice of organelles not bounded by two lipoprotein membranes.

Options

A. b, c, d, f
B. a, e, f
C. d, a , e , g
D. b, c, f

Answer

To solve the question of identifying cell organelles that are not bounded by two lipoprotein membranes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which of the listed organelles are not surrounded by two membranes. Organelles can be classified as either single-membrane-bound or double-membrane-bound.

2. **List the Organelles**: The organelles provided in the question are:
- (a) Nucleus
- (b) Lysosomes
- (c) Peroxisomes
- (d) Endoplasmic Reticulum (ER)
- (e) Mitochondria
- (f) Centrioles
- (g) Plastids

3. **Identify Double-Membrane-Bound Organelles**:
- **Nucleus**: Double membrane (nuclear envelope).
- **Mitochondria**: Double membrane.
- **Plastids**: Double membrane (like chloroplasts).

4. **Identify Single-Membrane-Bound Organelles**:
- **Lysosomes**: Single membrane.
- **Peroxisomes**: Single membrane.
- **Endoplasmic Reticulum (ER)**: Single membrane.
- **Centrioles**: Not membrane-bound (composed of microtubules).

5. **Compile the List of Organelles Not Bounded by Two Membranes**:
- Lysosomes (b)
- Peroxisomes (c)
- Endoplasmic Reticulum (d)
- Centrioles (f)

6. **Final Answer**: The organelles that are not bounded by two lipoprotein membranes are:
- (b) Lysosomes
- (c) Peroxisomes
- (d) Endoplasmic Reticulum
- (f) Centrioles