Lab 6 - Da plants Flashcards
What is a hydrophyte plant?
An aquatic plant :)
Name three adaptations in hydrophyte leaves.
They have chloroplast in their epidermis, very large air chamber in the spongy mesophyll and very thin cuticule. :D
What is the fonction of the very thin air chambers (located in the spongy mesophyll) in hydrophyte leaves?
Gives leaves buoyancy (tendency of an object to float or to rise in a fluid when submerged.).
Why do hydrophyte plants have very thin leave cuticles?
Having thin cuticles means less prevention of evaporation of water (so more evaporation hehe). The water stays less in the plant because they live in water.
What is the function of the chloroplast (located in this case in the epidermis) in hydrophyte plants?
Photosynthesis (epidermis cells allow sunlight to pass)
What is a xerophyte?
A plant adapted to environment with little water.
What are four adaptations of a xerophyte plant?
They have a thick promient cuticle, a multilayer epidermis, a reduced number of stomata and a stomata lined with their epidermis hair.
What are the functions of the thick cuticle in xerophyte plants?
It is a diffusion barrier limiting water and solute transport accross the apoplast (intracellular space with water and gas). It also protects the plant against pathogens and damage.
What are th function of the multilayer epidermis in xerophyte plants?
It protects against watre loss and regulates gas exchange.
What does having a reduced amount of stomata in xerophyte leaves do to a plant?
Having less stomata means less water loss.
Why are the stomatas of a xerophyte plant lined with its epidermal hair?
The hairs allow for increased accumulation of water and retains it around the stomata too.
Are chloroplast in the guard cells? If so, why?
Yes. It acts as a mechanism for sensing CO2 in the guard cell and is used for making sugars which turns into ATP. It helps with active transport.
Are chloroplast in the guard cells? If so, why?
Yes. It acts as a mechanism for sensing CO2 in the guard cell and is used for making sugars which turns into ATP. It helps with active transport.
What property of chloroplast pigments allows them to be seperated on the paper during chromatography?
Polarity and Solubility
Knowing that chromatography is non polar, why is chlorophyll b below chlorophyll a on the chromatograph?
Chlorophyll b is more polar (that means that if something is lower on the chromatgraph, it is more polar). In this case, chlorophyll b is more absorbent to the polar cellulose and less soluble in the non-polar solvent. (that just means it moves slower up the plate compared to the more polar molecule -> in this case chloroplast a)
