Plant Anatomy
The male part of the flower that produces pollen
The anther
The process of transfering pollen from the anther to the stigma
Pollination
What is the name for a plant's response to light? (tropism)
Phototropism
What tropism refers to a plant's response to gravity?
gravitropism
A plant is placed near a window and bends toward it. What stimulus is causing this?
Light
The female structure of a flower that recieves pollen during pollination
The Stigma
This type of reproduction produces genetically identical offspring (clones)
Asexual reproduction
Which way do shoots grow if they are positively phototropic?
Towards the light
Which type of gravitropism (positive or negative) do roots show when they grow downward?
Positive gravitropism
A plant is rotated slowly on a turntable and grows straight upward. Why?
Because light/gravity is evenly distributed, so auxin does not build up on one side.
What structure inside the ovary turns into seeds?
The ovules
Name two methods of asexual reporduction in plants
Runners, bulbs, tubers, cuttings
The plant hormone responsible for plants bending toward light
auxin
What is an example of negative gravitropism
Shoots growing upward, away from gravity
A seedling is placed horizontally and begins to curve upwards after two days. What stimulus is causing this?
Gravity
The style
Process that occurs after polination and results in the formation of a seed
ferilisation
What side of the shoot does auxin accumulate on (move to) when light hits it from one direction?
The shaded side
In roots, how does high amounts of auxin affect their growth?
It slows it down
A seedling is exposed to light evenly from all directions and it is growing straight upwards. What does this suggest about auxin distribution?
Auxin is evenly distributed, so growth is equal on both sides.
What is the role of the filament?
To support the anther
Give one advantage of sexual reproduction over asexual reproduction
genetic variation
Auxin builds up on the shaded side, causing those cells to elongate more, making the plant bend toward the light.
Explain why roots grow downward even if a seed is planted on its side
Gravity causes auxin to move to the lower side of the root, slowing growth there. The upper side grows faster, bending the root downward.
A plant is placed in a box with one light source. The stem bends toward the light and the roots grow downward. What two tropisms are occuring?
Positive phototropism and postive gravitropism