Correct Option
The correct option is (a).
Explanation
Frogs are amphibians, a class of vertebrates capable of inhabiting both aquatic and terrestrial environments. Their anatomical features are specifically adapted to facilitate movement and survival in these dual habitats.
Statement-wise Analysis
- Statement 1 is Correct: Frogs are amphibious organisms adapted to live both inside water and on land. They utilize cutaneous respiration (breathing through moist skin) while underwater and pulmonary respiration (breathing through lungs) when on land.
- Statement 2 is Incorrect: Frogs possess strong back legs (hind limbs), rather than weak ones. These powerful hind limbs are muscular and longer than the forelimbs, enabling them to make long leaps to catch prey or escape predators. Their movement is primarily jumping or leaping, not crawling.
- Statement 3 is Incorrect: Frogs possess webbed feet. The membrane of skin between their toes increases surface area, acting like a paddle to push water backward. This adaptation makes them efficient swimmers in their aquatic habitat.
Key Takeaway: Frogs are amphibians characterized by strong hind limbs for leaping and webbed feet for swimming, allowing them to thrive in both aquatic and terrestrial ecosystems.