Mark the important defence mechanism in plants against herbivour:-

Options

A. Spines
B. Toxic chemical
C. Both 1 `&` 2
D. None of these.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the important defense mechanisms that plants use against herbivores. Herbivores are animals that feed on plants, and plants have developed various strategies to protect themselves.

2. **Identifying Defense Mechanisms**: There are two primary types of defense mechanisms in plants:
- **Morphological Defense Mechanisms**: These are physical changes in the structure of the plant that deter herbivores. Examples include:
- **Spines**: Sharp structures that can injure herbivores.
- **Thorns**: Similar to spines, thorns are modified branches that can also cause harm.
- **Leaf Margins with Spines**: Some plants have spiny edges on their leaves to discourage feeding.

- **Chemical Defense Mechanisms**: These involve the production of toxic substances that can deter herbivores. Examples include:
- **Toxic Chemicals**: Many plants produce chemicals that are harmful or unpalatable to herbivores. These toxins can disrupt the metabolism of the herbivore or make the plant difficult to digest.

3. **Analyzing the Options**:
- **Option A: Spines** - This is a morphological defense mechanism.
- **Option B: Toxic Chemicals** - This is a chemical defense mechanism.
- **Option C: Both 1 and 2** - This option includes both spines and toxic chemicals, which are both valid defense mechanisms.
- **Option D: None of these** - This option is incorrect as both spines and toxic chemicals are indeed defense mechanisms.

4. **Conclusion**: Since both spines (morphological) and toxic chemicals (chemical) are important defense mechanisms that plants use against herbivores, the correct answer is **Option C: Both 1 and 2**.