Name important defence mechanisms in plants against herbivory.

Explanation

### Step-by-Step Text Solution

1. **Introduction to Defense Mechanisms**:
- Plants have developed various defense mechanisms to protect themselves from herbivores. These mechanisms can be broadly categorized into two types: morphological and chemical defense mechanisms.

2. **Morphological Defense Mechanisms**:
- **Cactus**: The leaves of cacti are modified into spines or thorns. This adaptation helps deter herbivores from feeding on them due to the sharpness and potential pain associated with these structures.
- **Acacia**: Acacia plants also exhibit morphological defenses with sharp thorns on their leaves. These thorns serve a similar purpose in preventing herbivores from consuming the plant.
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