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Photosynthesis and Plant Responses (Photosynthesis (Factors needed for…
Photosynthesis and Plant Responses
Photosynthesis
The way in which green plants make food
Factors needed for photosynthesis
Carbon dioxide
Passes into leaves through tiny openings called stomata
Get carbon dioxide from the air
Water
Get from soil
Enters in the roots
Veins in the leaves carry water to all parts of the leaves
Light
Gets light from the sun
Sunlight is absorbed by leaves
Provides the energy for photosynthesis
Chorophyll
Plants make
Green dye or pigment
Mostly found in the leaves
Absorbs light and allows photosynthesis to take place
Products of photosynthesis
Glucose
Food made by a plant
Made in the leaf
Used
To provide energy in resperation
To form starch in different parts of the plant
To form cellulose for a new cell wall
Oxygen
Gas made by photosynthesis
Used
Respiration to provide energy in the leaf
Released out of the leaf and into the air
Plant Responses
Tropism
Change in growth of a plant in response to an outside
Phototropism
The way in which a plant changes its growth in response to light
Geotropism
Is the way in which a plant changes its growth in response to gravity
How
The shoots of a plant respond by growing away from gravity. This allows the stem to grow upright
The roots of the plants grow towards gravity. This allows the roots to grow down into the soil. In this way, they can anchor the plant and absorb more water and minerals