Which of the following statements is/ are correct ?
(i) All green plants can prepare their own food.
(ii) Most animals are autotrophs.
(iii) Carbon dioxide is not required for photosynthesis.
(iv) Oxygen is liberated during photosynthesis.
Choose the correct answer from the options below:

Options

A. (i) and (iv)
B. (ii) only
C. (ii) and (iii)
D. (i) and (ii)

Answer

To determine which of the statements are correct, let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement (i): All green plants can prepare their own food.**
- Green plants are autotrophs, meaning they can synthesize their own food through the process of photosynthesis. They use carbon dioxide, water, and sunlight to produce glucose and oxygen. Therefore, this statement is **correct**.

### Step 2: Analyze Statement (ii)
**Statement (ii): Most animals are autotrophs.**
- Animals cannot produce their own food; they depend on other organisms for their nutrition. Hence, they are classified as heterotrophs. This statement is **incorrect**.

### Step 3: Analyze Statement (iii)
**Statement (iii): Carbon dioxide is not required for photosynthesis.**
- Carbon dioxide is a crucial component of the photosynthesis process. Green plants utilize carbon dioxide along with water and sunlight to produce food. Thus, this statement is **incorrect**.

### Step 4: Analyze Statement (iv)
**Statement (iv): Oxygen is liberated during photosynthesis.**
- During photosynthesis, particularly in the light-dependent reactions, water is split (photolysis), and oxygen is released as a byproduct. Therefore, this statement is **correct**.

### Conclusion:
Based on the analysis:
- Statement (i) is correct.
- Statement (ii) is incorrect.
- Statement (iii) is incorrect.
- Statement (iv) is correct.

Thus, the correct statements are (i) and (iv).

### Final Answer:
The correct answer is: **Statements (i) and (iv) are correct.**

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