Understanding Plant Hormones and Growth

What is the main active form of auxins?

• Indole-3-butyric acid

• Indole-3-acetic acid

• Indole-3-propionic acid

• Indole-3-valeric acid

Where are auxins predominantly produced in a plant?

• Root tips

• Leaf nodes

• Shoot apical meristem

• Flower buds

Which process is primarily mediated by auxins?

• Cell division

• Cell elongation

• Photosynthesis

• Respiration

What effect do auxins have on lateral (axillary) buds?

• Promote growth

• Inhibit growth

• No effect

• Cause flowering

What is the primary role of cytokinins in plants?

• Inhibit cell division

• Promote cell division

• Enhance photosynthesis

• Increase water absorption

Where are cytokinins normally synthesised in a plant?

• Leaves

• Stems

• Roots

• Flowers

Which of the following is a function of cytokinins?

• Delay senescence

• Promote fruit ripening

• Inhibit root growth

• Enhance seed dormancy

Gibberellins are primarily associated with which aspect of plant growth?

• Root development

• Leaf senescence

• Stem elongation

• Flowering inhibition

How are auxins transported within the plant?

• Through xylem only

• Through phloem only

• By diffusion and carrier-mediated transport

• By active transport only

Which plant hormone is known to stimulate differentiation of the meristem?

• Auxins

• Cytokinins

• Gibberellins

• Ethylene