If the tip of- seedling is cut off, growth as well as bending ceases because It hampers

Options

A. respiration
B. photosynthesis
C. perception of light stimulus
D. transpiration

Answer

To answer the question regarding the effects of cutting off the tip of a seedling, we can analyze each option provided and determine why growth and bending cease.

### Step-by-Step Solution:

1. **Understanding the Role of the Tip of the Seedling**:
- The tip of a seedling, known as the apical meristem, is crucial for growth and directional bending (phototropism). It produces hormones like auxins that promote cell elongation and growth.

**Hint**: Remember that the apical meristem is responsible for growth and directionality in plants.

2. **Analyzing the Options**:
- **Option 1: Respiration**:
- Respiration is the process of breaking down food to release energy. Cutting the tip does not directly affect respiration in the rest of the plant. Therefore, this option is incorrect.

**Hint**: Consider whether the process of respiration is localized to the tip or if it occurs throughout the plant.

- **Option 2: Photosynthesis**:
- Photosynthesis occurs primarily in the leaves, which remain intact after cutting the tip. Thus, cutting the tip does not stop photosynthesis. This option is also incorrect.

**Hint**: Think about where photosynthesis takes place and whether the leaves are still functional after the tip is removed.

- **Option 3: Precipitation of Light Stimulus**:
- The tip of the seedling is responsible for sensing light and directing growth towards it (phototropism). Removing the tip hampers the plant's ability to respond to light stimuli, halting both growth and bending. This option is correct.

**Hint**: Reflect on how plants respond to light and what part of the plant is responsible for this response.

- **Option 4: Transpiration**:
- Transpiration is the process of water movement through the plant and its evaporation from aerial parts. This process is mainly managed by the roots and leaves, and cutting the tip does not affect transpiration. Hence, this option is incorrect.

**Hint**: Consider how water movement occurs in plants and whether it relies on the tip of the seedling.

3. **Conclusion**:
- The correct answer is that cutting off the tip of the seedling hampers the precipitation of light stimuli, which is essential for growth and bending.

### Final Answer:
If the tip of the seedling is cut off, growth as well as bending ceases because it hampers the precipitation of light stimuli.