Read the following statements and select the correct option.
(i) A daughter receives X-chromosome from her mother only.
(ii) Human beings possess 22 pairs of autosomes and 1 pair of sex chromosomes.
(iii) In mammals, embryo develops outside the mother's body.
(iv) A new human individual develops from a cell called gamete.
(v) Pituitary gland produces thyroid-stimulating hormone (TSH), which stimulates the thyroid to produce thyroxine.
(vi) Azygote is formed as a result of fertilisation.

Options

A. Statements (iii) and (v) are incorrect, while statements (i), (ii), (iv) and (vi) are correct
B. Statements (i) and (iii) are incorrect, while statements (ii), (iv), (v) and (vi) are correct.
C. Statements (iii) and (iv) are incorrect, while statements (i), (ii), (v) and (vi) are correct.
D. Statements (i), (iii) and (iv) are incorrect, while statements (ii), (v) and (vi) are correct.

Explanation

To determine which statements are correct, let's analyze each one step by step:

1. **Statement (i)**: "A daughter receives X-chromosome from her mother only."
- This statement is incorrect. A daughter receives one X chromosome from her mother and one X chromosome from her father. Therefore, she does not receive the X chromosome exclusively from her mother.

2. **Statement (ii)**: "Human beings possess 22 pairs of autosomes and 1 pair of sex chromosomes."
- This statement is correct. Humans have 22 pairs of autosomes (non-sex chromosomes) and 1 pair of sex chromosomes (XX for females and XY for males).

3. **Statement (iii)**: "In mammals, embryo develops outside the mother's body."
- This statement is incorrect. In mammals, the embryo develops inside the mother's body after internal fertilization.

4. **Statement (iv)**: "A new human individual develops from a cell called gamete."
- This statement is misleading. A new individual develops from the fusion of male and female gametes (sperm and egg), not from a single gamete alone. Therefore, this statement is incorrect.

5. **Statement (v)**: "Pituitary gland produces thyroid-stimulating hormone (TSH), which stimulates the thyroid to produce thyroxine."
- This statement is correct. The pituitary gland does produce TSH, which in turn stimulates the thyroid gland to produce thyroxine.

6. **Statement (vi)**: "A zygote is formed as a result of fertilization."
- This statement is correct. A zygote is indeed formed when a male gamete (sperm) fertilizes a female gamete (egg).

### Summary of Correctness:
- Correct Statements: (ii), (v), (vi)
- Incorrect Statements: (i), (iii), (iv)

### Conclusion:
The correct option includes statements (ii), (v), and (vi). Therefore, the answer is option D.

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