Darwin and his son, ________, did experiments on phototropism.
Francis
1 of 15
What was the conclusion of Darwin's experiment?
'Some influence' was transmitted from the shoot tip to the lower part of the seedlings, which caused them to bend.
2 of 15
What is the 'coleoptile'?
A protective sheath which covers the first leaf in grassroots and cereals.
3 of 15
_________ and Jensen demonstrated that a chemical was passed down the coleoptile. This was done by removing the tip and placing it on a small block of ____ _____. Then placing that block on top of the ___ end.
Boysen, Agar jelly, Cut
4 of 15
What was the result of the Boysen-Jensen experiment?
the coleoptile had started to grow again.
5 of 15
How did Went provide further evidence? Explain his experiment + result.
by placing the agar blocks on one side of the cut coleoptile tip in the dark; this caused the coleoptile to curve away from the side receiving the chemical messenger from the agar.
6 of 15
The chemical was later identified as IAA, _______ ____.
Indoleacetic Acid
7 of 15
What is IAA's major function?
To stimulate growth
8 of 15
Where is the highest concentration of auxin found in a curved plant?
on the shaded side
9 of 15
Why was the Cholodny-Went model criticized?
Because of its small sample sizes and the difficulty of measuring small concentrations.
10 of 15
How do they make auxin visible in modern technology?
By using fluorescent proteins.
11 of 15
How is auxin transported:
a) long distances?
b) short distances e.g. between cells?
a) through the phloem
b) via specific carriers proteins in the cell membrane
12 of 15
Auxin stimulate ______ pumps. These pumps move __ ions from the cytoplasm into the cell wall.
proton, H+
13 of 15
Where are auxins synthesised?
In the meristems.
14 of 15
The acidification of the cell increases the ________ ________ across the membrane. It also enhances the uptake of ____ and _____.
potential difference, ions, water
15 of 15
Other cards in this set
Card 2
Front
What was the conclusion of Darwin's experiment?
Back
'Some influence' was transmitted from the shoot tip to the lower part of the seedlings, which caused them to bend.
Card 3
Front
What is the 'coleoptile'?
Back
Card 4
Front
_________ and Jensen demonstrated that a chemical was passed down the coleoptile. This was done by removing the tip and placing it on a small block of ____ _____. Then placing that block on top of the ___ end.
Back
Card 5
Front
What was the result of the Boysen-Jensen experiment?
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