Sci 7.2

Represents the type and number of atoms in a molecule.

Symbolic representation of a chemical reaction.

Process where plants make their own food using sunlight.

A type of sugar produced during photosynthesis.

A gas used by plants during photosynthesis.

Chemical equation representing photosynthesis.

Energy stored in starch formed from glucose.

Visual representation of a molecule demonstrating atoms.

Glucose is a simple sugar that is soluble in water and tastes sweet. Plants produce glucose during photosynthesis.

Plants convert excess glucose into starch, an insoluble and tasteless form of carbohydrate. Starch acts as a storage form of energy, similar to how humans store energy as glycogen.

Light energy is absorbed by chlorophyll in plants, providing the energy needed to convert carbon dioxide and water into glucose. It's like sunlight powering the plant's food-making factory.

We can test for the presence of starch and oxygen, the products of photosynthesis, to confirm if the plant has carried out the process.

The word equation for photosynthesis is: Carbon dioxide + Water --> Glucose + Oxygen. This summarizes the process of converting carbon dioxide and water into glucose and oxygen using light energy.

Alcohol is used to dissolve chlorophyll from the leaf cells, making it easier to observe any color changes in the leaf. Chlorophyll is a green pigment that masks other colors.

A test used to detect the presence of starch in a sample. It involves adding iodine solution, which turns blue-black in the presence of starch.

The alcohol turns green because it dissolves the chlorophyll from the leaf cells.

Indicates that a plant has performed photosynthesis and stored excess glucose as starch.

The leaf is placed in hot water after the alcohol to remove any remaining alcohol from the leaf and make it soft for observation.

Plants need carbon dioxide for photosynthesis. Sodium hydrogencarbonate provides this.

The white tile provides a contrasting background to make the color of the leaf more visible.

After using alcohol, the leaf might change color depending on the pigments present. For example, red or yellow pigments may become visible.

Photosynthesis releases oxygen as a byproduct. This can be observed by testing for oxygen bubbles.

A plant that carries out photosynthesis, such as Hydrilla, which releases oxygen bubbles during photosynthesis.

The experiment demonstrates that leaves contain pigments other than chlorophyll, which become visible when chlorophyll is removed.

The Bunsen burner is used to heat the water, providing the necessary temperature to dissolve the chlorophyll.

Safety spectacles protect the eyes from potential splashes or fumes during the experiment.

Leaves with different colored patches, often green and non-green, due to varying chlorophyll content.

A green pigment found in plants that absorbs light energy for photosynthesis.

To remove starch from a plant by keeping it in the dark for a period, preventing photosynthesis.

Factor kept constant in an experiment to ensure its effect is not the cause of any observed changes.

The factor deliberately changed by the experimenter to observe its effect on the dependent variable.

The factor being measured or observed in an experiment, whose change is influenced by the independent variable.

Light is essential for photosynthesis because it provides the energy needed to convert carbon dioxide and water into glucose.

Organisms, mainly algae and bacteria, that make their own food through photosynthesis in the ocean. They are responsible for producing more than half of Earth's oxygen.

Simple, plant-like organisms that produce oxygen through photosynthesis. They are major producers in the ocean, and many are microscopic.

Oxygen is a byproduct of photosynthesis. It is released into the atmosphere and used by other living organisms for respiration.

Photosynthesis occurs in chloroplasts, which are organelles found in plants and algae. They contain chlorophyll, the pigment that captures light energy.

6CO2 + 6H2O + light energy → C6H12O6 + 6O2

Glucose is a type of sugar that provides energy for the plant. It can be used immediately or stored as starch for later use.