Photosynthesis
ICSE · Class 10 · Biology
Flashcards for Photosynthesis — ICSE Class 10 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is photosynthesis? Write the chemical equation.
Answer
Photosynthesis is the process by which green plants prepare their food (glucose) from carbon dioxide and water with the help of chlorophyll in the presence of sunlight. Chemical equation: 6CO₂ + 12H₂…
Why are leaves called the photosynthetic organ? List any four adaptations of leaves for photosynthesis.
Answer
Leaves are called photosynthetic organs because they are the main site where photosynthesis occurs. Four adaptations: 1. Flat and thin structure provides large surface area for maximum light absorpti…
What are chloroplasts? Describe their structure.
Answer
Chloroplasts are biconvex disc-like organelles (4-10 μm diameter, 2-3 μm thick) where photosynthesis occurs. Structure: - Double unit membrane boundary - Stroma: aqueous matrix inside - Grana: stacks…
Name the three types of photosynthetic pigments and their colors.
Answer
Three types of photosynthetic pigments: 1. Chlorophyll: Green color (most important) - Has magnesium-containing head and phytol tail - Types: a, b, c, d, e 2. Carotenes: Orange to yellow color…
Explain the mechanism of opening and closing of stomata during day and night.
Answer
Day time (Opening): - Guard cells perform photosynthesis - Glucose concentration increases - Cell sap becomes hypertonic - Water enters by endosmosis - Guard cells become turgid and kidney-shaped - St…
What is the K⁺ ion theory for stomatal movement?
Answer
K⁺ Ion Theory: - During day: Guard cells produce ATP through photosynthesis - ATP actively pumps K⁺ ions from surrounding cells into guard cells - Increased K⁺ makes cell sap hypertonic - Water enters…
What is light reaction (Hill's reaction)? Where does it occur and what are its main events?
Answer
Light Reaction (Hill's Reaction): - First phase of photosynthesis requiring light - Occurs in grana of chloroplasts Main events: 1. Light excites chlorophyll electrons to higher energy state 2. H⁺ io…
What is photolysis and photophosphorylation?
Answer
Photolysis: - Breaking down of water molecules (H₂O) into H⁺ and OH⁻ ions - Occurs in thylakoids using energy of photons - Results in oxygen evolution Photophosphorylation: - Formation of ATP by comb…
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