Geotropism and Plant Responses

The video tutorial explains geotropism, the movement of plant organs in response to gravity. It covers three types: progeotropism, apogeotropism, and diageotropism. An experiment using germinated seeds demonstrates these movements, showing roots grow towards gravity (positive geotropism) and shoots grow away (negative geotropism). The role of starch granules in directing root growth is also discussed.

What is the primary source of stimulus in geotropism?

• Temperature

• Gravity

• Water

• Light

Which type of geotropism is observed in primary roots?

• Apogeotropism

• Phototropism

• Pro-geotropism

• Diageotropism

In which type of geotropism do plant parts grow away from gravity?

• Apogeotropism

• Diageotropism

• Pro-geotropism

• Hydrotropism

What is the role of pneumatophores in mangroves?

• Gas exchange

• Nutrient storage

• Water absorption

• Support

Which type of geotropism involves horizontal growth?

• Pro-geotropism

• Apogeotropism

• Diageotropism

• Phototropism

Where is diageotropism commonly observed?

• Primary roots

• Secondary roots

• Leaves

• Flowers

What is the purpose of the experiment with germinated seeds?

• To explain chemotropism

• To illustrate geotropic movement

• To show hydrotropism

• To demonstrate phototropism

What role do starch granules play in geotropism?

• They provide energy

• They direct root movement

• They store water

• They aid in photosynthesis

What happens to the roots when the experimental setup is inverted?

• They grow horizontally

• They bend towards gravity

• They stop growing

• They grow upwards

What is the nature of shoots in terms of geotropism?

• Hydrotropic

• Diageotropic

• Negatively geotropic

• Positively geotropic