NEET BIOLOGY

Detailed explanation-1: -Stem and leaves show positive phototropism whereas root shows negative phototropism.

Detailed explanation-2: -Specifically, stems exhibit positive phototropism, or curvature toward the light, while roots show negative phototropism, or curvature away from the light.

Detailed explanation-3: -Sunflowers are a great example of positive phototropism, because not only do their stems curve toward the light but their flowers turn to face the sunlight as well.

Detailed explanation-4: -Phototropism in stem and root are due to differential phytohormonal effect. Stem grows positively phototropic. Roots grow negatively geotropic. Auxin is responsible for apical dominance and positive phototropism by stem.

Detailed explanation-5: -One important light response in plants is phototropism, which involves growth toward-or away from-a light source. Positive phototropism is growth towards a light source; negative phototropism is growth away from light.