Photosynthesis and Plant Responses Flashcards
what is a stimulus
A stimulus is anything that causes a response in an organism
how to plants respond to light
Shoots will always grow upwards towards light
how do plants respond to gravity
roots will always grow downwards in response to gravity
what is a tropism
A tropism is the growth of a plant in response to a stimulus
what is geotropism
Geotropism is the plants response to gravity for example the roots always grow towards gravity
what are the benefits of geotropism
It makes sure plant roots travel down to find water and minerals in soil
•Having deep roots means the plant is anchored in the soil
what is phototropism
Phototropism is the plants response to light for example the shoot will always grow towards light
what are the benefits of phototropism
It makes sure plants get enough light for photosynthesis, so that they can make food
What do we call it that plant shoots grow towards light
positively phototropic
What do we call it that roots grow away from light
negatively phototropic
What do we call it that plant shoots grow against gravity
negatively geotropic
What do we call it that roots grow with gravity
positively geotropic
what does photo mean
light
what does synthesis mean
to make
what is photosynthesis
Photosynthesis is the process where green plants make food using light energy
why are leaves and plants green
Because the contain Chlorophyll which is a green chemical needed for photosynthesis
where is chlorophyll found?
Chlorophyll is found in Chloroplasts in plant cells
where are chloroplasts found
in plant cells
what part of the plant has the most chlorophyll?
The leaves and any green part of the plant have chlorophyll
how do plants make their food?
Energy from sunlight,
with chlorophyll as a catalyst, is used to
combine CO2 and H2O to form glucose and
release O2
how does response take place in plants
Plants respond to the stimuli of Light and Gravity
what is a stimulus
A stimulus is anything that causes a response in an organism
how to plants respond to light
Shoots will always grow upwards towards light
how do plants respond to gravity
roots will always grow downwards in response to gravity
what is a tropism
A tropism is the growth of a plant in response to a stimulus
what is geotropism
Geotropism is the plants response to gravity for example the roots always grow towards gravity
what are the benefits of geotropism
It makes sure plant roots travel down to find water and minerals in soil
•Having deep roots means the plant is anchored in the soil
what is phototropism
Phototropism is the plants response to light for example the shoot will always grow towards light
what are the benefits of phototropism
It makes sure plants get enough light for photosynthesis, so that they can make food
What do we call it that plant shoots grow towards light
positively phototropic
What do we call it that roots grow away from light
negatively phototropic
What do we call it that plant shoots grow against gravity
negatively geotropic
What do we call it that roots grow with gravity
positively geotropic
what does photo mean
light
what does synthesis mean
to make
what is photosynthesis
Photosynthesis is the process where green plants make food using light energy
why are leaves and plants green
Because the contain Chlorophyll which is a green chemical needed for photosynthesis
where is chlorophyll found?
Chlorophyll is found in Chloroplasts in plant cells
where are chloroplasts found
in plant cells
what part of the plant has the most chlorophyll?
The leaves and any green part of the plant have chlorophyll
how do plants make their food?
Energy from sunlight,
with chlorophyll as a catalyst, is used to
combine CO2 and H2O to form glucose and
release O2
how does response take place in plants
Plants respond to the stimuli of Light and Gravity
how do plants make and store food
When sunlight is absorbed by chlorophyll in the chloroplasts, water is transported in the xylem vessel and carbon dioxide is taken in at the stomata in the leaves, glucose (food) is made in the leaves and oxygen is given out at the stomata. Food is stored as starch, which we test for using iodine.
why do some plants lose their leaves in winter?
they find it difficult to carry out photosynthesis
save energy, not much sunlight
word equation for aerobic respiration
glucose + oxygen → carbon dioxide + water
word equation for photosynthesis
carbon dioxide + water → glucose + oxygen
why are leaves flat and thin?
Leaves are flat and thin so sunlight can get through them
why do leaves have stomata?
Leaves have tiny holes called STOMATA to allow oxygen out and carbon dioxide in
what is the function of stomata?
to allow oxygen out and carbon dioxide in
Where do plants get carbon dioxide from?
Carbon dioxide comes from the atmosphere
Where do plants get water from?
Water comes in through the roots from the soil
what do plants do with glucose when they make it?
Like us plants use glucose for growing and repairing damaged parts
If they don’t use it they store it as starch this is why we can eat plants that store starch such as potatoes and wheat!
how do plants transport glucose?
Plants transport the glucose around in special cells called PHLOEM cells
