Secondary 2 Flashcard

Front

Where does photosynthesis occur?

Back

Chloroplasts

Answer explanation

Photosynthesis occurs in chloroplasts, which are specialized organelles in plant cells. Mitochondria are involved in cellular respiration, while humans and animals do not perform photosynthesis.

Front

What are the reactants in Photosynthesis?

Back

sun, carbon dioxide, water

Answer explanation

In photosynthesis, the reactants are sunlight, carbon dioxide (CO2), and water. These are used by plants to produce glucose and oxygen, making 'sun, carbon dioxide, water' the correct choice.

Front

For photosynthesis, a plant needs water, sun, and...

Back

carbon dioxide

Answer explanation

For photosynthesis, plants require water, sunlight, and carbon dioxide. Carbon dioxide is essential as it is converted into glucose during the process, while oxygen is a byproduct, not a requirement.

Front

Which of the following is the correct equation for PHOTOSYNTHESIS? Options: carbon dioxide + water --> oxygen + glucose, _{carbon dioxide} + glucose + water --> oxygen , oxygen + water --> carbon dioxide + glucose, glucose+ oxygen ---> water + carbon dioxide 

Back

carbon dioxide + water --> oxygen + glucose

Answer explanation

The correct equation for photosynthesis is carbon dioxide + water --> oxygen + glucose. This process occurs in plants, where they convert CO2 and H2O into glucose and release O2 as a byproduct.

Front

What pigment absorbs sunlight for photosynthesis?

Back

chlorophyll

Answer explanation

Chlorophyll is the pigment in plants that absorbs sunlight for photosynthesis, allowing them to convert light energy into chemical energy. Other options like chloroplasts and thylakoids are structures, not pigments.

Front

Look at the diagram. Which gas would most likely be found in the greatest amount in the bubbles?

Back

oxygen

Answer explanation

Oxygen is produced during photosynthesis and is commonly found in bubbles in aquatic environments. Therefore, it is the gas most likely present in the greatest amount in the bubbles compared to nitrogen, ozone, or carbon dioxide.

Front

If all four plants were watered daily but placed in a closet, receiving no sunlight, what process would NOT occur?

Back

Photosynthesis

Answer explanation

Photosynthesis requires sunlight to convert carbon dioxide and water into glucose and oxygen. In a closet with no sunlight, this process cannot occur, making it the correct answer.

Front

Which organelle stores water for use in photosynthesis?

Back

Vacuole

Answer explanation

The vacuole is the organelle responsible for storing water in plant cells, which is essential for photosynthesis. Chloroplasts are involved in the process, but they do not store water.

Front

How would the concentration of CO₂ in water affect photosynthesis?

Back

The higher the CO₂, the greater the rate

Answer explanation

The higher the CO2 concentration in water, the greater the rate of photosynthesis. CO2 is a key reactant in the photosynthesis process, and increased availability enhances the production of glucose and oxygen.

Front

If we enclosed a plant in an air-proof bottle, what would happen to the rate of photosynthesis?

Back

Gradually slow down to zero because CO₂ is used up.

Answer explanation

Enclosing a plant in an air-proof bottle limits CO₂ availability for photosynthesis. As CO₂ is consumed, the rate of photosynthesis will gradually slow down to zero, as the plant cannot perform photosynthesis without this essential gas.