What are auxins and what do they do? Flashcards
They are plant mormones which cause cell elongation in plants.
How are petals adapted for insect pollination?
They are brightly coloured to attract them.
What is the definition of pollination?
Pollination is the transfer of pollen from the anther of a plant to the stigma of a plant.
What is pollination?
The transfer of pollen from the anther of a plant to the stigma of the plant.
Which tropism involves shoots growing away from gravity?
Negative geotrophism
What is the effect of more auxin in shoots?
More auxin= greater cell elongation= longer cells on bottom, so the shoot moves up.
Explain the effect of increasing air temperature on the rate of transpiration in a plant. [2 marks]
An explanation that combines identification - understanding (1 mark) and reasoning/justification - understanding (1 mark):
transpiration rate is increased (1 mark)
because water molecules have more energy/move faster (1 mark)
What does the style do?
It is where the pollen tube grows down to the female sex cells (ovules).
What part does the ovary turn into
the fruit
The student wanted to find out where the hormone that caused the response to directional light was found.
The student had two growing plant shoots and placed them both in a window with light coming from one direction.
Describe a method the student could use to show that the hormone was found in the tip of the plant shoot. [2 marks]
An answer that combines the following points to provide a logical description of the method:
remove the tip from one of the plant shoots and leave the other (1 mark)
measure the changes in growth and direction of movement (1 mark)
What is the effect of more auxin in roots?
More auxin= Less cell elongation= longer cells on top, so the root moves down.
what is a gamete
a reproductive cell in a plant
A class was asked to measure the volume of oxygen produced by a water plant called Cabomba in one minute.
One student decided to count the number of bubbles.
Explain the student could improve the method in order to measure the volume of oxygen released more accurately. [2 marks]
An explanation that combines identification - improvement of the experimental procedure (1 mark) and justification/reasoning which must be linked to the improvement (1 mark):
collect the oxygen produced in a graduated gas syringe (1 mark)
to reduce the errors generated when counting bubbles which maybe of different sizes (1 mark)
Will accept alternative gas collection method with measuring cylinder and beehive shelf and will accept leave the apparatus for a longer amount of time.
Give a way in which a plant can naturally reproduce a-sexually.
Runners
What affect do auxins have on shoots and roots?
Shoots: Greater cell elongation, longer cells on bottom, shoot moves up.
Roots: Less cell elongation, longer cells on top, root moves down.
what is a tropism?
a plant’s response to a stimulus
