Identify the FALSE statement.

Correct option is B

The correct answer is (B) The growth of pollen tubes towards ovules is an example of geotropism.

Explanation:

1. The sunflower is a phototrophic plant:
• This is true.
• Phototropism is the growth movement of plants in response to light. Sunflowers exhibit phototropism, especially when their young flower buds track the sun's movement (heliotropism).
2. The growth of pollen tubes towards ovules is an example of geotropism:
• This is false.
• The growth of pollen tubes towards ovules is an example of chemotropism, not geotropism. Chemotropism is a growth response to chemical stimuli, guided by chemicals released by the ovules.
3. Geotropism is demonstrated by the downward migration of roots:
• This is true.
• Geotropism (or gravitropism) refers to the growth of plant organs in response to gravity. Roots exhibit positive geotropism as they grow downward into the soil.
4. Hydrotropism is the tendency to grow in moist areas, i.e., the movement of roots towards high humidity:
• This is true.
• Hydrotropism is the growth response to moisture, seen in roots moving toward areas of higher water concentration.