Homework - Photosynthesis

• Science
• Lower Secondary (Key Stage 3)

Homework - Photosynthesis

What is the main energy source for plants and algae?

1. Nutrients
2. Carbon dioxide
3. Sunlight
4. Water

Which process do plants use to make glucose?

1. Photosynthesis
2. Fermentation
3. Transpiration
4. Respiration

What is the waste product of photosynthesis?

1. Oxygen
2. Glucose
3. Water
4. Carbon dioxide

Where do algae usually live?

1. On land
2. In the air
3. Underwater
4. In soil

What do algae lack compared to plants?

1. Chlorophyll
2. Leaves, stems, and roots
3. Flowers
4. Sunlight absorption

Where is sunlight absorbed in plant cells?

1. Mitochondria in root cells
2. Vacuoles in stem cells
3. Chloroplasts in leaf cells
4. Cytoplasm in flower cells

How is water transported to the leaves in plants?

1. Through stem capillaries
2. Through phloem tubes
3. Through leaf veins
4. Through xylem tubes

What diffuses into the leaves through stomata?

1. Water vapor
2. Nitrogen
3. Carbon dioxide
4. Oxygen

How is waste oxygen released from plant leaves?

1. Through stomata
2. Through root cells
3. Through chloroplasts
4. Through xylem tubes

Where is chlorophyll, the green pigment, found in plants?

1. Cytoplasm in flower cells
2. Nucleus of stem cells
3. Mitochondria in root cells
4. Chloroplasts in leaf cells

What is the main site of photosynthesis in a leaf?

1. Spongy layer
2. Vein cells
3. Waxy layer
4. Palisade layer

What is the function of the stomata on the leaf?

1. Absorb sunlight
2. Produce oxygen
3. Transport water and glucose
4. Allow gases to diffuse in and out

What is the role of the guard cells in the leaf?

1. Open and close the stomata
2. Produce glucose
3. Support the leaf structure
4. Store water and nutrients

What is the purpose of the waxy layer on the top of the leaf?

1. Reduce water evaporation
2. Regulate gas exchange
3. Protect from physical damage
4. Increase photosynthesis efficiency

Which layer of the leaf contains air spaces for gas diffusion?

1. Vein cells
2. Spongy layer
3. Waxy layer
4. Palisade layer

What is the purpose of boiling the leaf in the first step of testing for starch?

1. To remove excess water from the leaf.
2. To break down and soften the leaf tissue.

What happens to the color of the leaf when drops of iodine are added if starch is present?

1. It remains yellow.
2. It turns from yellow to blue-black.

How can the rate of photosynthesis of an aquatic plant be measured?

1. By counting bubbles of gas given off.
2. By measuring the water temperature.

What gas is collected when measuring the rate of photosynthesis of an aquatic plant?

1. Oxygen, which can relight a glowing splint.
2. Carbon dioxide, which extinguishes a glowing splint.

What is the purpose of using ethanol after boiling the leaf in starch testing?

1. To remove all the chlorophyll from the leaf.
2. To enhance the color change in the leaf.

How does light intensity affect the rate of photosynthesis?

1. Decreases the rate of photosynthesis
2. Stops photosynthesis
3. Increases the rate of photosynthesis
4. Has no effect on photosynthesis

What happens if the temperature is too low for photosynthesis?

1. Stops photosynthesis
2. Has no effect on photosynthesis
3. Photosynthesis will speed up
4. Photosynthesis will be slower

What impact does an increase in temperature have on photosynthesis?

1. Speeds up photosynthesis
2. Photosynthesis will stop
3. Has no effect on photosynthesis
4. Slows down photosynthesis

What is the relationship between light intensity and photosynthesis?

1. No relationship
2. Inversely proportional
3. Directly proportional
4. Randomly fluctuating

What is the effect of the optimum temperature on photosynthesis?

1. Stops photosynthesis
2. Maximizes photosynthesis rate
3. Has no effect on photosynthesis
4. Minimizes photosynthesis rate