6.06 Plants Flashcards
Germination:
A process of plant growth from a seed or a spore.
Monocot:
a flowering plant that has a single leaf in the seed and floral parts in multiples of three.
Dicot:
structure in which two leaves are present.
A seed has…
- seed coat
- endosperm
- cotyledon
- hypocoytl
Cotyledon:
the inner leaf of a seed
Hypocoytl:
the tip of the root only found in dicots
Endosperm:
the food source
Monocot life cycle:
- enzymes activate growth
- embryo grows with the food source of the endosperm
- the seed coat bursts open and the root tip emerges
- leaf tip shoots up and the root tip reaches deeper into the ground
- leaf tip hits the light, and the leaves escape from their covering
Dermal Tissue
Protection of plant from water loss.
Ground tissue parts
Collenchyma cells have thicker cell walls and are responsible for support of herbaceous plants.
Schlerenchyma cells die at maturity and provide structural support for woody plants
Monocot stems
Dicot Stems
Monocot stems have dispersed vascular bundles. In this cross-section, the vascular bundles are spread throughout the monocot stem.
Dicot stems have vascular tissues arranged in a ring, with the large xylem cells to the inside and the smaller phloem cells to the outside.
Plant responses
tropism. There are three main types of tropisms that guide plant responses. The first, phototropism, is a response to light that directs the stem to grow toward the light and roots to grow away from it.
The second, gravitropism, is the growth toward or away from gravity. Stems and leaves grow away from the force of gravity while roots grow toward it.
Lastly, plants have a touch response called thigmotropism