What regulates photosynthesis?

What regulates photosynthesis?

Photosynthesis is tightly regulated via a feedback network that controls the activity of the light-harvesting antenna and prevents photodamage. The key players in this process are membrane proteins that act as molecular switches and respond to changes in light or pH. Feedback regulation in photosynthesis.

Which structure directly regulates the rate of photosynthesis in this plant?

The gas exchange of carbon dioxide and oxygen occurs through small, regulated openings called stomata. In all autotrophic eukaryotes, photosynthesis takes place inside an organelle called a chloroplast. In plants, chloroplast-containing cells exist in the mesophyll.

Which part of a plant is used to absorb sunlight during photosynthesis?

chloroplasts
Inside the plant cell are small organelles called chloroplasts, which store the energy of sunlight. Within the thylakoid membranes of the chloroplast is a light-absorbing pigment called chlorophyll, which is responsible for giving the plant its green color.

How does light regulate photosynthesis?

Plant physiology and metabolism are fueled by sunlight. The essential biological process, which harnesses light to produce metabolic energy and oxygen, is coined photosynthesis. Changes in light intensity directly affect the photosynthetic electron transport reactions located in the thylakoid membrane of plants.

How does light regulate the rate of photosynthesis?

As you rise from low light intensity to higher light intensity, the rate of photosynthesis will increase because there is more light available to drive the reactions of photosynthesis. At a very high intensity of light, the rate of photosynthesis would drop quickly as the light starts to damage the plant.

Which structure regulates gas exchange during the process of photosynthesis and respiration?

Stomata and Gas Exchange Stomata, as mentioned above, are the structures through which gas exchange occurs in leaves. Each stoma is surrounded by two guard cells, which can open and close depending on environmental conditions.

Which pair of structures below regulates the movement of gases in and out of the leaf?

stomata
During photosynthesis, leaves take in atmospheric CO2 and release O2 through stomata, microscopic pore structures in the leaf epidermis (singular = stoma). A pair of guard cells surrounds each stoma, and these cells control the opening and closing of the stomatal pore between them.

What does sunlight do in photosynthesis?

The Sun! The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas. After the sugar is produced, it is then broken down by the mitochondria into energy that can be used for growth and repair.

What does PSII do?

PSII is the multisubunit chloroplast membrane-associated pigment–protein complex that uses the energy of sunlight to drive the oxidation of water, evolving oxygen, donating electrons into the photosynthetic electron transfer chain, and depositing protons into the thylakoid lumen.

What is the function of stomata in photosynthesis?

In photosynthesis, plants use carbon dioxide, water, and sunlight to produce glucose, water, and oxygen. Glucose is used as a food source, while oxygen and water vapor escape through open stomata into the surrounding environment.

Where do the products of photosynthesis enter the leaf?

CO2 enter through the underside of the leaf. Water enters through the central vein. What are the products of photosynthesis? From where do the products leave the leaf? Oxygen and water vapor exits from the underside of the leaf and glucose exits through the veins.

What is the function of guard cells in photosynthesis?

As such, guard cells play a crucial role in photosynthesis by regulating the entry of materials necessary for the process. Apart from regulating gaseous exchange (as well as water release from leaves), they have also been shown to contain chloroplasts which also make them a site of photosynthesis.

How are plants able to transport water to the leaves?

Plants use water potential to transport water to the leaves so that photosynthesis can take place. Water potential is a measure of the potential energy in water as well as the difference between the potential in a given water sample and pure water. Water potential is represented by the equation Ψ system = Ψ total = Ψ s + Ψ p + Ψ g + Ψ m.