Unit 13 class 11th biology (2024)

  • Q: What is the primary source of all food on earth?A: Photosynthesis.

  • Q: What do green plants use to synthesize food?A: Light energy, CO2, and water.

  • Q: What are green plants that can synthesize their own food called?A: Autotrophs.

  • Q: What is the role of chlorophyll in photosynthesis?A: Absorbs light energy.

  • Q: What experiment shows that light and chlorophyll are required for photosynthesis?A: Starch formation in variegated leaves.

  • Q: What experiment demonstrates that CO2 is necessary for photosynthesis?A: Part of a leaf enclosed in a test tube with KOH, exposed to light.

  • Q: Who discovered the role of air in the growth of green plants?A: Joseph Priestley.

  • Q: What did Joseph Priestley use in his experiments to demonstrate the role of plants in purifying air?A: A burning candle, a mouse, and a mint plant in a bell jar.

  • Q: Who showed that sunlight is essential for the plant process that purifies the air?A: Jan Ingenhousz.

  • Q: What did Jan Ingenhousz observe in his experiments with an aquatic plant?A: Oxygen bubbles formed around green parts in bright sunlight.

  • Q: Who provided evidence for glucose production in plants?A: Julius von Sachs.

  • Q: What substance did Julius von Sachs find in green parts of plants?A: Chlorophyll in chloroplasts.

  • Q: Who used a prism to split light and studied the action spectrum of photosynthesis?A: T.W. Engelmann.

  • Q: What is the empirical equation for photosynthesis in oxygen-evolving organisms?A: CO2 + H2O + light → [CH2O] + O2.

  • Q: Who demonstrated that photosynthesis is a light-dependent reaction?A: Cornelius van Niel.

  • Q: What does the correct equation for photosynthesis include?A: 6CO2 + 12H2O + light → C6H12O6 + 6H2O + 6O2.

  • Q: Where does photosynthesis mainly take place in plants?A: In the chloroplasts of green leaves.

  • Q: What are the two main parts of the chloroplast involved in photosynthesis?A: Grana and stroma.

  • Q: What are the light reactions of photosynthesis responsible for?A: Trapping light energy and synthesizing ATP and NADPH.

  • Q: What are the dark reactions of photosynthesis responsible for?A: Synthesizing sugar from CO2 using ATP and NADPH.

  • Q: How many pigments are involved in photosynthesis?A: Four: chlorophyll a, chlorophyll b, xanthophylls, and carotenoids.

  • Q: Which pigment is the most abundant and crucial for photosynthesis?A: Chlorophyll a.

  • Q: What is the role of accessory pigments in photosynthesis?A: Absorb additional wavelengths of light and protect chlorophyll a.

  • Q: What are the two photosystems involved in light reactions?A: Photosystem I (PS I) and Photosystem II (PS II).

  • Q: What is the reaction center chlorophyll in PS I called?A: P700.

  • Q: What is the reaction center chlorophyll in PS II called?A: P680.

  • Q: What is the Z scheme in photosynthesis?A: The characteristic shape formed by the transfer of electrons through the electron transport chain.

  • Q: How is water split in photosynthesis?A: Into 2H+, [O], and electrons.

  • Q: What is cyclic photophosphorylation?A: A process where only PS I is involved and produces ATP without NADPH.

  • Q: What is non-cyclic photophosphorylation?A: A process involving both PS II and PS I, producing ATP and NADPH.

  • Q: What happens to electrons in the reaction center of PS II?A: They become excited and are passed to an electron acceptor.

  • Q: What is the role of NADP+ in photosynthesis?A: It is reduced to NADPH + H+ by accepting electrons.

  • Q: What does the splitting of water produce?A: Oxygen, protons, and electrons.

  • Q: What is the Calvin cycle?A: The series of biochemical reactions that synthesize glucose from CO2.

  • Q: What are the three stages of the Calvin cycle?A: Carbon fixation, reduction phase, and regeneration of RuBP.

  • Q: What enzyme is crucial for carbon fixation in the Calvin cycle?A: Rubisco.

  • Q: What is photorespiration?A: A process where oxygen is consumed and CO2 is released, reducing the efficiency of photosynthesis.

  • Q: What is the C4 pathway?A: An alternative pathway for carbon fixation that minimizes photorespiration.

  • Q: Which plants typically use the C4 pathway?A: Plants in hot and dry environments, like maize and sugarcane.

  • Q: What is the primary CO2 acceptor in C4 plants?A: PEP (Phosphoenolpyruvate).

  • Q: What are bundle sheath cells?A: Specialized cells in C4 plants where the Calvin cycle occurs.

  • Q: How does the C4 pathway minimize photorespiration?A: By concentrating CO2 in the bundle sheath cells.

  • Q: What is CAM photosynthesis?A: A process where stomata open at night to reduce water loss and store CO2 for use during the day.

  • Q: Which plants use CAM photosynthesis?A: Succulents like cacti and pineapples.

  • Q: What factors affect the rate of photosynthesis?A: Light intensity, CO2 concentration, temperature, and water availability.

  • Q: What is the compensation point in photosynthesis?A: The light intensity at which the rate of photosynthesis equals the rate of respiration.

  • Q: How does light intensity affect photosynthesis?A: Increased light intensity boosts the rate of photosynthesis to a certain point.

  • Q: What is the effect of CO2 concentration on photosynthesis?A: Higher CO2 concentration can increase the rate of photosynthesis.

  • Q: How does temperature influence photosynthesis?A: There is an optimal temperature range for maximum photosynthetic efficiency.

  • Q: What role does water play in photosynthesis?A: It is a substrate in the light reactions and helps maintain plant turgidity.

  • These flashcards cover key points from your notes on photosynthesis in higher plants.

    Unit 13 class 11th biology (2024)
    Top Articles
    Latest Posts
    Article information

    Author: Sen. Emmett Berge

    Last Updated:

    Views: 5745

    Rating: 5 / 5 (60 voted)

    Reviews: 83% of readers found this page helpful

    Author information

    Name: Sen. Emmett Berge

    Birthday: 1993-06-17

    Address: 787 Elvis Divide, Port Brice, OH 24507-6802

    Phone: +9779049645255

    Job: Senior Healthcare Specialist

    Hobby: Cycling, Model building, Kitesurfing, Origami, Lapidary, Dance, Basketball

    Introduction: My name is Sen. Emmett Berge, I am a funny, vast, charming, courageous, enthusiastic, jolly, famous person who loves writing and wants to share my knowledge and understanding with you.