Control of Plant Growth

Auxin, a plant hormone, is crucial for various growth processes. It is produced in the stem tip and influences cell elongation, primary and secondary growth, flower and fruit development, and responses to gravity and light. Auxin also plays a role in apical dominance by inhibiting the growth of lower branches, allowing the main stem to grow vertically for optimal sunlight exposure.

What is the primary function of auxin in plant growth?

• To inhibit root growth

• To stimulate cell elongation in roots and stems

• To produce chlorophyll

• To absorb nutrients from the soil

How does auxin contribute to secondary plant growth?

• By promoting cell division in cambium layers

• By increasing leaf size

• By enhancing root absorption

• By producing more seeds

Which plant parts' growth is stimulated by auxin?

• Leaves only

• Flower parts

• Stems only

• Roots only

In what way does auxin affect a plant's response to environmental factors?

• It helps the plant absorb more water

• It enhances the plant's photosynthesis process

• It regulates the plant's response to gravity and light

• It increases the plant's resistance to pests

What is the term for the phenomenon where the main stem's growth is prioritized over side branches?

• Apical dominance

• Root dominance

• Stem dominance

• Lateral dominance