Plant Nutrition Flashcards
(28 cards)
What are plants classified as in terms of nutrition?
Autotrophs
Plants produce their own food through processes like photosynthesis.
What is photosynthesis?
The process by which plants manufacture glucose from carbon dioxide and water using sunlight and chlorophyll.
What is the role of chlorophyll in photosynthesis?
Chlorophyll traps light energy from the Sun.
What are the raw materials needed for photosynthesis?
- Carbon dioxide
- Water
- Sunlight
What is released as a waste product during photosynthesis?
Oxygen
What is the word equation for photosynthesis?
Carbon dioxide + Water → Glucose + Oxygen
What is the chemical equation for photosynthesis?
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
What happens to glucose after it is produced in photosynthesis?
- Used in respiration
- Converted to sucrose for transport
- Converted to starch for storage
- Converted to cellulose for cell walls
Why is photosynthesis important for the ecosystem?
It converts light energy into chemical energy and maintains the composition of air.
What is the purpose of testing a leaf for starch?
To indicate which parts of the leaf are photosynthesizing.
What is the first step in testing for starch in a leaf?
Cut a leaf from a potted plant.
What does a blue-black coloration indicate when testing for starch?
Starch is present.
What does it mean if a leaf remains brown during the starch test?
Starch is absent.
What conclusion can be drawn from the experiment with Leaf A and Leaf B where Leaf A is covered?
Light is necessary for photosynthesis.
In the experiment showing the necessity of carbon dioxide, what happens to Plant A?
The leaf remains brown, indicating starch is absent.
What does a variegated leaf demonstrate in photosynthesis experiments?
Chlorophyll is necessary for photosynthesis.
What is one method to measure the rate of photosynthesis using pondweed?
Counting the number of oxygen bubbles produced per minute.
How does light intensity affect the rate of photosynthesis?
The rate increases with light intensity until other factors become limiting.
What happens to the rate of photosynthesis at high temperatures?
It decreases as enzymes are denatured.
What is a limiting factor in photosynthesis?
A condition that restricts the rate of photosynthesis due to its short supply.
List the three main limiting factors of photosynthesis.
- Temperature
- Light intensity
- Carbon dioxide concentration
What is the function of guard cells in a leaf?
They control the opening and closing of stomata.
What is the role of xylem in a plant?
Transports water into the leaf.
What is the role of phloem in a plant?
Transports sucrose and amino acids from leaves to other parts.
