Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Habitat: The natural environment where a plant lives and grows is called its habitat. Plants adapt to their surroundings to survive.
Terrestrial Plants: Plants that grow on land. These are further classified into plants of plains, mountains, deserts, marshy areas, and coastal regions.
Desert Adaptations: To prevent loss of , desert plants like the Cactus have leaves reduced to spines. Photosynthesis is carried out by the green, fleshy stem which stores water.
Mountain Plants: Trees like Pine and Fir are cone-shaped with needle-like leaves. This shape allows snow to slide off easily during winters.
Marshy Areas: In clayey soil where air cannot reach the roots, plants like Mangroves have 'breathing roots' or pneumatophores that grow above the ground to absorb .
Aquatic Plants: These grow in water. They are categorized as Floating (e.g., Duckweed), Fixed (e.g., Lotus), and Submerged (e.g., Hydrilla).
Submerged Plants: These plants, like Tape Grass, have narrow leaves with no stomata. They breathe through their body surface and help clean water by absorbing .
Insectivorous Plants: Plants like the Venus Flytrap and Pitcher Plant grow in nitrogen-deficient soil. They trap and digest insects to fulfill their nitrogen requirements.
📐Formulae
💡Examples
Problem 1:
Why do plants in hilly areas have a conical shape and needle-like leaves?
Solution:
The conical shape helps the snow to slide off the branches easily, preventing them from breaking. Needle-like leaves have a waxy coating to prevent damage from frost and minimize loss.
Explanation:
This is a physical adaptation to survive in extremely cold climates and heavy snowfall.
Problem 2:
Explain how a Cactus is able to survive in a habitat with very little .
Solution:
- Leaves are modified into spines to reduce transpiration. 2. The stem is green and fleshy to perform photosynthesis and store . 3. Roots spread deep or wide to absorb maximum moisture.
Explanation:
Deserts have high temperatures and low rainfall, so plants must conserve water to stay alive.
Problem 3:
What is the primary function of submerged plants in an aquarium?
Solution:
Submerged plants like Hydrilla absorb the exhaled by aquatic animals and release during photosynthesis.
Explanation:
This helps in maintaining the balance of gases in the water, making it suitable for fish to breathe.