Growth slows down as the plant reaches maturity or resources become limited. 3. Meristems: The Engines of Growth
Found at the tips of roots and shoots. They are responsible for primary growth (length).
The stress hormone that closes stomata and maintains dormancy. Ethylene: The gas responsible for fruit ripening. Extrinsic Factors (External)
Located at the base of leaves or nodes, commonly seen in grasses, allowing them to regrow after being grazed. 4. Factors Influencing Plant Development
Understanding plant growth isn't just academic; it’s the backbone of global food security. By manipulating growth factors and hormones, scientists can increase crop yields and develop plants that withstand climate change.
Essential for photosynthesis and photoperiodism (flowering response).
is a fascinating survival mechanism where seeds refuse to germinate even under favorable conditions, ensuring they "wait" for the absolute best time to grow. 6. Photoperiodism and Vernalization How do plants know when to flower?
An irreversible, permanent increase in the size of an organ or its parts. It is primarily driven by cell division and cell enlargement.
The initial slow growth period where the plant establishes its roots and begins basic cellular processes.