Plant Growth and Development Concepts

The video explains plant growth patterns, focusing on primary and secondary growth. Primary growth occurs at apical and axillary buds, leading to taller plants. Apical dominance, controlled by auxin, inhibits lateral bud growth. Gravitropism and phototropism influence growth direction. Secondary growth, seen in dicot angiosperms and gymnosperms, increases plant width and forms wood. The video covers plant structure, growth mechanisms, and the role of hormones in growth regulation.

What is the primary function of buds in plant growth?

• To absorb nutrients from the soil

• To serve as locations for mitosis

• To facilitate photosynthesis

• To produce flowers

What happens to a plant when the apical bud is removed?

• It stops growing

• It becomes bushier

• It grows taller and thinner

• It produces more flowers

Which chemical is responsible for inhibiting the growth of lateral buds?

• Ethylene

• Auxin

• Gibberellin

• Cytokinin

Why do plants grow tall before becoming bushy?

• To avoid being eaten by animals

• To produce more seeds

• To conserve water

• To reach sunlight before neighboring plants

What is gravitropism?

• Growth in response to gravity

• Growth in response to light

• Growth in response to water

• Growth in response to temperature

Which types of plants exhibit secondary growth?

• Monocots

• Only gymnosperms

• Dicot angiosperms and gymnosperms

• All flowering plants

What is the main result of secondary growth in plants?

• Production of seeds

• Increased width and formation of wood

• Formation of flowers

• Increased height

What is the role of phloem in plants?

• Transporting water

• Absorbing nutrients

• Transporting sugars

• Providing structural support

What happens to the old layers of xylem in plants with secondary growth?

• They decompose and disappear

• They become part of the bark

• They are absorbed by the plant

• They form the heartwood

Which part of the plant is responsible for transporting water from roots to shoots?

• Leaves

• Bark

• Phloem

• Xylem