Jan. 28th (Exam One) Flashcards
What are the main geological time eras that we have talked about?
- Precambrian (before 540mya)
- Paleozoic (540-250mya)
- Mesozoic (250-66mya)
- Cenozoic (66mya - now)
What structure present in the female reproductive organ is responsible for eventually becoming the seed?
The ovule.
What are meristems?
These are the dividing cells of the plant that give rise to various tissues.
They are kind of like the stem cells of plants.
What are the apical meristems responsible for?
What do they produce?
They are responsible for primary growth - growth in length.
They produce the primary tissue including:
- Dermal Tissue
- Ground Tissue
- Vascular Tissue
What are herbaceous plants?
What is unique about them in reference to their growth?
They are non-woody plants with soft flexible stems.
They only demonstrate primary growth.
What are the lateral meristems responsible for?
What do they produce?
They are responsible for secondary growth - growth in width.
They produce the secondary tissue including:
- Cork Cambium
- Vascular Cambium
What type of tissue is the epidermis?
Above the ground, what is it covered by?
What are the functions?
It is a part of the dermal tissue
Above the ground it is covered by the cuticle.
Functions:
- Protection from pathogens
- Protection from water loss
What are trichomes?
What is their function?
They are hair-like extensions of epidermal cells.
Functions:
- They can act as a deterrent
- They can help prevent water loss (the trichomes block the breeze)
What are the stomates and the guard cells of the dermal tissue?
What are their respective functions?
Stomates - opening in the dermal tissue
Guard cells - these are the cells around the stomates that regulate the opening and closing of pores.
They both function in gas exchange in unique ways, as well as preventing water loss.
What does the cork cambium become? Is this primary or secondary growth?
It becomes the periderm This is technically secondary growth but it contributes to the dermal tissue.
