Understanding Plant Hormones

What are the main types of plant hormones?

• Stomata

• Auxins, Gibberellins, Cytokinins, Abscisic Acid, Ethylene

• Photosynthesis

• Chlorophylls

Which hormone is primarily responsible for cell elongation?

• Cytokinin

• Gibberellin

• Ethylene

• Auxin

What role do auxins play in plant growth?

• Auxins are responsible for photosynthesis in plants.

• Auxins only affect root growth and have no impact on stems.

• Auxins promote cell elongation and regulate growth in response to environmental stimuli.

• Auxins inhibit cell division and promote dormancy.

How do cytokinins affect plant cell division?

• Cytokinins have no effect on plant cell division.

• Cytokinins only promote root growth, not cell division.

• Cytokinins promote cell division in plants by stimulating the cell cycle and enhancing protein and nucleic acid synthesis.

• Cytokinins inhibit cell division by blocking the cell cycle.

What is the function of gibberellins in plants?

• Gibberellins inhibit growth and flowering in plants.

• Gibberellins only affect root development in plants.

• Gibberellins promote growth, seed germination, and flowering in plants.

• Gibberellins are responsible for photosynthesis in plants.

How do abscisic acid levels change in response to stress?

• Abscisic acid levels increase in response to stress.

• Abscisic acid levels remain unchanged during stress.

• Abscisic acid levels decrease in response to stress.

• Abscisic acid levels fluctuate randomly in response to stress.

What is the role of ethylene in fruit ripening?

• Ethylene is a type of fertilizer used for fruit development.

• Ethylene acts as a signaling molecule that promotes and accelerates the ripening of fruits.

• Ethylene inhibits the ripening process in fruits.

• Ethylene is a nutrient that enhances fruit growth.

How do plant hormones interact to regulate growth?

• Plant hormones are solely responsible for photosynthesis.

• Plant hormones only promote growth without any interaction.

• Plant hormones interact in a network to regulate growth by influencing processes like cell elongation, division, and responses to environmental stimuli.

• Plant hormones do not affect cell division or elongation.

What is the significance of auxin in phototropism?

• Auxin only affects root growth, not stem growth in phototropism.

• Auxin promotes differential growth in plants, causing them to bend towards light in phototropism.

• Auxin inhibits growth in plants, causing them to grow away from light.

• Auxin has no effect on plant growth during phototropism.

How do gibberellins influence seed germination?

• Gibberellins have no effect on seed germination processes.

• Gibberellins only affect the color of seeds during germination.

• Gibberellins inhibit seed germination by promoting dormancy.

• Gibberellins promote seed germination by breaking dormancy and stimulating enzyme production.