Consider the following statements
(A) Plant cells have centrioles which are absent in almost all animal cells
(B) Ribosomes are the site of protein synthesis
(C) The middle lamella is a layer made of calcium carbonate which holds the different neighbouring cells together
(D) In animal cell, steroidal hormones are synthesised by smooth endoplasmic reticulum
Of the above statements

Options

A. (A) and (B) only are correct
B. (C) and (D) only are correct
C. (B) and (D) only are correct
D. (A) and (D) only are correct

Answer

To solve the question regarding the correctness of the statements about plant and animal cells, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: Plant cells have centrioles which are absent in almost all animal cells.**
- **Analysis:** This statement is incorrect. Centrioles are primarily found in animal cells and are absent in most plant cells. Therefore, this statement is false.

2. **Statement B: Ribosomes are the site of protein synthesis.**
- **Analysis:** This statement is correct. Ribosomes are indeed the sites of protein synthesis in both prokaryotic and eukaryotic cells, including plant and animal cells. Thus, this statement is true.

3. **Statement C: The middle lamella is a layer made of calcium carbonate which holds the different neighboring cells together.**
- **Analysis:** This statement is incorrect. The middle lamella is primarily composed of pectin, not calcium carbonate. It acts as a cementing layer between plant cells, so this statement is false.

4. **Statement D: In animal cells, steroidal hormones are synthesized by the smooth endoplasmic reticulum.**
- **Analysis:** This statement is correct. The smooth endoplasmic reticulum (SER) is involved in the synthesis of steroid hormones and lipids in animal cells. Therefore, this statement is true.

### Conclusion:
Based on the analysis:
- Statement A is incorrect.
- Statement B is correct.
- Statement C is incorrect.
- Statement D is correct.

Thus, the correct statements are B and D.

### Final Answer:
The correct option is B and D only are correct.

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