A.6 - Histology of plant organs (regarding to nutrition and digestibility) Flashcards
Give the histological layers of a plant
- Rhizodermis
- Cortex
- Endodermis
- Central Stele
What is the function of the root pith, where is it located?
- Storage, Most nutritious part of the root
- Heart of the stele
Why are storage roots easier to digest?
They are dominated by parenchymal cells
Chlorenchyma is found in…
Dicots
Where is secondary stem growth rare?
Monocots
Give the types of secondary stem growth
- Tilia Type
- Ricinus Type
- Aristolochia Type
- Helianthus Type
What is the border of xylem and phloem?
Cambium
Heartwood lacks the ability to…
Conduct water
What kind of wood conducts water and nutrients?
Sapwood
The different layers of woody plants
- Softwood
- Hardwood
- Heatwood
- Sapwood
Leaves have pre-determined growth
True or false?
True
What do leaves protect?
Stem apex
The terms ‘hypostomatic’, ‘epistomatic’ and ‘amphistomatic’ describe…
The presence of Stomata on the leaf
What is the central leaf parenchyma called?
Mesophyll
What is a C4 plant?
Plants which have radiate mesophyll geometry
Better CO2 fixation
What property defines a plant to be good for forage?
A good stem:leaf ratio
Give the characteristics of flowers in terms of their histology
- One layer epidermis
- Papillae
- Poor nutritive value
- Pigmentation in vacuoles
What forms the walls of pollen?
Sporopollenin
What forms the adhesives for pollen?
Pollenkitt
Morphologically, what are Stamens and pistils?
Modified leaves with chlorenchyma and parenchyma present
What do fruits consist of?
- Exocarp
- Mesocarp
- Endocarp
- Parenchyma
The exocarp is sometimes lignified
true or false?
True
What are seed walls composed of?
Hemicellulose
Which nutrients are present in the seed?
- Perisperm
- Endosperm
