Factors Affecting Photosynthesis_Unsolved Paper
Chapter: Life Processes | Topic: Factors Affecting Photosynthesis
FACTORS AFFECTING PHOTOSYNTHESIS_UNSOLVED PAPER
Topic: Factors Affecting Photosynthesis
Q1. Which of the following is an essential factor required for photosynthesis?
- Nitrogen
- Hydrogen
- Oxygen
- Carbon Dioxide
Q2. Which pigment captures sunlight for photosynthesis?
- Melanin
- Chlorphyll
- Haemoglobin
- Keratin
Q3. A plant kept in complete darkness for several days will show reduced photosynthesis mainly because of the absence of:
- Water
- Oxygen
- Sunlight
- Mineral
Q4. Which environmental factor directly affects the opening and closing of stomata, thereby influencing photosynthesis?
- Wind speed
- Carbon dioxide availability
- Water availability
- Soil colour
Q5. Which of the following combinations provides the raw materials needed for photosynthesis?
- Oxygen and glucose
- Water and carbon dioxide
- Nitrogen and oxygen
- Water and starch
Q6. A healthy green leaf performs photosynthesis more efficiently than a yellow leaf mainly because it contains:
- More starch
- More chlorophyll
- More water
- More oxygen
Short questions
Q1. Name any four factors that affect the rate of photosynthesis.
Q2. Explain how sunlight influences the process of photosynthesis.
Q3. Why is chlorophyll essential for photosynthesis?
Q4. During the rainy season, many plants receive less sunlight. Explain how this may affect the process of photosynthesis.
Q5. Why is carbon dioxide considered a limiting factor for photosynthesis?
Q6. A gardener waters plants regularly during summer. Explain how water helps in maintaining efficient photosynthesis.
Q1. Explain the role of sunlight, chlorophyll, carbon dioxide, and water in photosynthesis. Discuss how the absence of any one of these factors affects the process.
Q2. Describe the different environmental and internal factors that influence the rate of photosynthesis. Support your explanation with suitable examples.
Q3. A student conducts an experiment by keeping identical plants under different environmental conditions. Explain how changing one factor at a time helps in studying the effect of various factors on photosynthesis.
Q1. Three identical potted plants are kept under the following conditions for one week:
Plant A: Full sunlight with regular watering
Plant B: Dim light with regular watering
Plant C: Full sunlight but no watering
Compare the expected rate of photosynthesis in all three plants and explain the role of the factors involved.
Q2.A farmer notices that crops growing under the shade of a large tree are shorter and produce fewer leaves than crops growing in the open field.
Using your knowledge of factors affecting photosynthesis, explain the possible reasons for this difference.
Q3.During a school science project, students place one green plant in normal air and another inside a closed transparent container with limited fresh air.
Discuss how the availability of carbon dioxide may influence photosynthesis in both plants and predict the expected observations.