Botany
Fach von Ubrm
Fach von Ubrm
Set of flashcards Details
| Flashcards | 143 |
|---|---|
| Students | 18 |
| Language | English |
| Category | Biology |
| Level | University |
| Created / Updated | 27.01.2022 / 13.12.2022 |
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Name three different root metamorphosis and give examples:
- Storage roots: sweet potato, carrot - Root tendrils: vanilla - Root thorns: palm tree
Name three different shoot metamorphosis and give examples:
- Tubers: potato - Bulbs: onion - Tendrils: vine
Name four different leaf metamorphosis and give examples:
leave tendrills: peas
leave succulence: living stones
leave thorns: barberry (berberitze)
storage leaves: bulbs : onion
Name three different types of cells and describe them:
parenchym cells: thin walled, living, isodiametic-> can convert to meristem
idioblasts: including often crystals-> protection to herbivore
sclerenchym: dead, thick walled, isodiametic-> make fruit or seed shells hard
What is the function of the respiratory roots and in which plants are they found?
To supply below ground roots with oxygen, especially in poor soils; found in many mangroves.
What is the function of the living bark?
Protection against water loss, extreme temperature, and mechanical damage.
What is the difference between vassels and tracheids?
Both are dead, thick walled and lignified.
Tracheids: elonged single cells, connected via pits, used for water transport and stabilisation. Speed of transport: ~ 0,4 mm/s.
Vessels: long tubers, individual cells, used only for water transport. More efficient way of transport. Speed of transport: 15 – max. 40 mm/s
What is the function of the border pits in conifer wood?
They function as ‘check valves’; the central part of the membrane is thickened, when embolism occurs (high pressure difference) the thick part of the membrane is sucked to one side, closing a large pore → spread of emboli is blocked.
How do the vascular bundles in roots differ from those in shoots?
In roots they are in one radial bundle; in shoots they are collateral.
- Phanerophytes: woody, perennial, >30 cm above ground, trees and shrubs; example: Holler - Geophytes: plants surviving with storage organs; example: Gelbstern - Therophytes: annuals, plants that survive as seeds; example: Kornrade, all cereals are therophytes
Which cell types are forming the xylem in angiosperm?
Vascular tissue
Which tissues arise from the pericycle?
Periderm
How is the epidermis characterised?
Has no intercellular spaces (except stomata!), no chloroplasts, single layer of cells, outer walls are thickened.
What is characteristic for the rhizodemis?
Has no stomata, no cuticle, bears no leaves.
Where in plants are meristems found?
In embryonic tissues.
What are intercellular spaces and how are they formed?
Small or large spaces between cells, mostly filled with gas or sometimes filled with plant product.
How does the hair in nettles function?
???
Hypostomatous means stomata are....
casparian stripes (bands) serve for ...
Bracts are...
plasmodesms are....
During the past 200 years, the CO2 concentration in the atmosphere....
What is heterophylly?
