Question

VII. Give scientific reasons.
1. Hydrilla has a thin, weak and flexible stem.
2. Submerged aquatic plants lack stomata. GOTS
3. Water hyacinth has a spongy body.
4. Stems of xerophytes appear thick and swollen.

Answer 1

Explanation:

The plants which are growing in water partially or completely are known as hydrophytes. Water may be freshwater or saline. Plants that grow in freshwater bodies like ponds, lakes, pools, streams, rivers, etc. are known as freshwater plants, and those growing in saltwater are known as marine plants. The stem is long, slender, weak, spongy, and flexible type in hydrophytes. It is weak due to underdeveloped supporting tissue. The stem is short, stoloniferous, thick and spongy with extensive parenchyma in free-floating plants.

So, the correct answer is option C.

Answer 2

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