Consider the following adaptations of submerged aquatic plants: 1. In submerged plants, the leaves float on the surface of the water. 2. Some plants have narrow and thin ribbon-like leaves. 3. Leaves are often highly divided to allow water to flow without damaging them. Which of the statements given above are correct?

The correct option is (c). Explanation Aquatic plants, or hydrophytes, exhibit distinct morphological adaptations depending on their habitat zones. Submerged plants grow completely underwater and have evolved specific leaf structures to withstand water currents and low light conditions. - Statement 1 is Incorrect: In submerged aquatic plants, the entire plant body, including the leaves, remains underwater. Plants with leaves that float on the surface are classified as floating-leaved hydrophytes (e.g., Water Lily), not submerged plants. - Statement 2 is Correct: Many submerged plants (e.g., Vallisneria) possess narrow, thin, and ribbon-like leaves. This streamlined shape minimizes resistance to water currents, preventing the plant from being uprooted or damaged. - Statement 3 is Correct: In several submerged species, leaves are highly divided or dissected. This adaptation allows flowing water to pass through the leaves easily without tearing them, while maintaining sufficient surface area for nutrient absorption and photosynthesis. Key Takeaway: Submerged aquatic plants typically feature narrow, ribbon-like, or highly divided leaves to reduce water resistance, whereas floating plants possess broad, flat leaves to maximize buoyancy and sunlight exposure.

Consider the following adaptations of submerged aq... - NCERT Class 6 Science MCQ

Solution

The correct option is (c).

Explanation

Aquatic plants, or hydrophytes, exhibit distinct morphological adaptations depending on their habitat zones. Submerged plants grow completely underwater and have evolved specific leaf structures to withstand water currents and low light conditions.

Statement 1 is Incorrect: In submerged aquatic plants, the entire plant body, including the leaves, remains underwater. Plants with leaves that float on the surface are classified as floating-leaved hydrophytes (e.g., Water Lily), not submerged plants.
Statement 2 is Correct: Many submerged plants (e.g., Vallisneria) possess narrow, thin, and ribbon-like leaves. This streamlined shape minimizes resistance to water currents, preventing the plant from being uprooted or damaged.
Statement 3 is Correct: In several submerged species, leaves are highly divided or dissected. This adaptation allows flowing water to pass through the leaves easily without tearing them, while maintaining sufficient surface area for nutrient absorption and photosynthesis.

Key Takeaway: Submerged aquatic plants typically feature narrow, ribbon-like, or highly divided leaves to reduce water resistance, whereas floating plants possess broad, flat leaves to maximize buoyancy and sunlight exposure.

NCERT Class 6 Science — Chapter 4: The living organisms - characteristics and habitats

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