Plants

Created by

Demi

Cards (20)

What does the phloem transport?
Food substances (sugar)
Which transports substances in both directions - xylem or phloem?
Phloem
Which contains sieve plates - xylem or phloem?
Phloem
Which contains companion cells - xylem or phloem?
Phloem
Which contains lignin - xylem or phloem?
Xylem
Which transports water and minerals - xylem or phloem?
Xylem
Which are hollow - xylem or phloem?
Xylem
Which transports substances in only one direction - xylem or phloem?
Xylem
What does xylem transport?
Water and minerals
Which mineral ion is found in chlorophyll?
Magnesium ion
Give 3 similarities between xylem and phloem
Both form long tubes
Both contain elongated cells
Both found in stems, leaves and roots of plants
Why does the stomata close at night?
To reduce transpiration (water loss)
How do stomata close?
Water moves out of guard cells by osmosis
Guard cells become flaccid closing the stomata
What is the formula for Rf value?
Distance moved by ink ÷ distance moved by solvent
What does it mean if a pigment in chromatography had the greatest attraction for the solvent?
It moved the furthest
Why might a pigment not move in chromatography?
It did not dissolve in the solvent
Describe a method to separate the pigments in the crushed grass leaves using chromatography:
Mix solvent with crushed leaves
Filter to remove insoluble parts
Draw start line on chromatography paper in pencil
Place drop of filtrate on start line and allow to dry
Repeat adding drop and drying
Place paper in a solvent with the solvent level at start line
Allow solvent and pigment to separate up the paper
Why might there be fewer pigments in yellow grass leaves than in green grass leaves?
Lack of sunlight for photosynthesis
How does chromatography cause different pigments to separate?
They have different solubilities/attractions to the solvent so they move different distances
Why does the green colour need to be removed from leaves by boiling before food tests?
So colour change can be seen