Find the correct answers : For germination of angiospermic seeds
1 On hydration the seed germinates showing increased enzyme activity
2 Respiration rate of germinating seeds increases alongwith increased enzymatic acitivity
3 Increase in respiratory rate continues till senescence
4 Rate of enzymatic activity increases

Options

A. a , b and c
B. a and b
C. b and d
D. a and c

Answer

To solve the question regarding the germination of angiospermic seeds, we will analyze each statement provided and determine their validity step by step.

### Step-by-Step Solution:

1. **Understanding Germination**:
- Germination is the process by which a seed develops into a new plant. It involves the growth of the embryo within the seed, leading to the emergence of a seedling.

2. **Analyzing Statement 1**:
- **Statement**: "On hydration the seed germinates showing increased enzyme activity."
- **Explanation**: When a seed absorbs water (hydration), it activates hydrolytic enzymes that facilitate the breakdown of stored food, which is essential for the growth of the embryo. This statement is **true**.

3. **Analyzing Statement 2**:
- **Statement**: "Respiration rate of germinating seeds increases along with increased enzymatic activity."
- **Explanation**: As seeds germinate, they require energy, which is obtained through respiration. The increase in enzymatic activity correlates with the increased respiration rate as the seed utilizes oxygen to produce energy. This statement is **true**.

4. **Analyzing Statement 3**:
- **Statement**: "Increase in respiratory rate continues till senescence."
- **Explanation**: Senescence refers to the aging process of the plant. The respiratory rate does increase during germination but stabilizes after a certain point and does not continue to increase until senescence. Thus, this statement is **false**.

5. **Analyzing Statement 4**:
- **Statement**: "Rate of enzymatic activity increases."
- **Explanation**: While enzymatic activity does increase during the initial stages of germination, it does not continue to increase indefinitely; it stabilizes after reaching a certain level. Therefore, this statement is **false**.

6. **Conclusion**:
- From the analysis:
- Statement 1: True
- Statement 2: True
- Statement 3: False
- Statement 4: False
- The correct answers are statements 1 and 2.

### Final Answer:
The correct answer is **Option 2: A and B are true**.