Question

Answer the following questions in short.
1. Define habitat.
2. What are submerged plants? Give an example.
3. Write any two adaptive features of fish.
4. What are succulent plants?
5. Why are the leaves of pine trees needle-like?​

Answer 1

Answer:

1. A habitat is the natural home of a living thing which provides it with food, water and the necessary environment for it to live.

2. Submerged plants are rooted plants whose stems and most of their vegetative mass is below the water surface, although small portions may stick above the water. Example : Hydrilla

3. Fishes have gills which help them to obtain oxygen from the water and they have a streamlined body to reduce the fluid friction.

4. Succulent plants are plants which are full of juice or moisture.

5. The leaves of pine trees are needle like to prevent loss of water from transpiration.It also helps them to shed snow.

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Answer 2

1) A habitat is a place where an organism makes its home. A habitat meets all the environmental conditions an organism needs to survive.

2) Submerged plants are rooted plants with flaccid or limp stems and most of their vegetative mass is below the water surface, although small portions may stick above the water. Example - American Pondweed, Brittle Waternymph, etc.

3) (i) Fish have gills that allow them to “breathe” oxygen in water. Water enters the mouth, passes over the gills, and exits the body through a special opening. Gills absorb oxygen from the water as it passes over them.

(ii) Fish have a stream-lined body. They are typically long and narrow, which reduces water resistance when they swim.

4) In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions.

5)(i) Needle shape helps the leaves to retain moisture, preventing water loss as the stomatas are sunken and tightly packed in needle like leaves.

(ii) Needle shape gives them ability to shed snow as pine trees are found in cold regions.