Midterm Flashcards
(226 cards)
What are the three plant organs?
Roots, stems, and leaves
What is the primary function of roots?
Anchor the plant, absorb minerals and water, store carbohydrates
What are some specialized functions of roots?
Support, obtaining oxygen, storage
What is the primary function of stems?
to elongate and orient the shoot for photosynthesis
What are some specialized functions of stems?
Support, reproduction
What are some examples of stems?
Rhizomes, stolons, tubers, brussel sprouts
What is the primary function of leaves?
photosynthesis
What are some secondary functions of leaves?
Gas exchange, heat dissipation, defense from herbivores and pathogens
What are some specialized functions of leaves?
Defense, reproduction, storage, movement
What are some examples of leaves?
spines, tendrils, plantlets, onions
What are the three types of plant tissues?
dermal, vascular, ground
What is the main function of dermal tissue?
protection and reduction of water loss
Describe ‘periderm’
the protective layer of dermal tissue that replaces the epidermis in woody plants
Describe ‘cuticle’
a part of the epidermis that prevents water loss
Describe ‘trichomes’
a dermal tissue that reduces water loss, reflects light, and defends against insects
What is the main function of vascular tissue?
to transport materials and provide mechanical support
What is the main function of xylem?
to conduct water and dissolved minerals upward
Describe ‘tracheids’
a type of xylem that has long thin walls with tapered ends and thin regions lacking secondary walls called pits through which water moves
Describe ‘vessel elements’
a type of xylem that has end walls with perforation plates so water can flow freely
What is the main function of phloem?
transport sugars from production areas to storage/growing areas
What kind of plants have sieve cells? What kind of tissue are they?
Seedless vascular plants and gymnosperms, phloem
What kind of plants have sieve tubes?
angiosperms
Describe ‘sieve tubes’
chains of cells called sieve-tube elements whose porus end walls between them (sieve plates) allow for fluid to flow between cells
Each sieve-tube element is connected to a companion cell (that has organelles) by plasmodesmata
What are some functions of ground tissue?
storage, photosynthesis, support, transport