Parts of the plant present on the stem include leaves, buds, flowers, and fruits.

Here are the answers to your questions:

1. Parts of the plant present on the stem include leaves, buds, flowers, and fruits.
2. A herb has soft, green, and flexible stems. These stems are typically non-woody.
3. The conditions required for a seed to grow into a new plant are adequate water, suitable warmth (temperature), and sufficient oxygen.
4. The main function of leaves is photosynthesis, the process by which plants make their own food using sunlight, water, and carbon dioxide.
5. Two vegetables that are actually fruits are tomato and cucumber.