FBISE Class 9th (SSC-l)
Explore subjects and practice MCQs
3
Chapters
1,610
Total MCQs
FBISE Class 9th (SSC-l)
Answer: ATP supplies energy instantly because it can release energy quickly by breaking a phosphate bond.
Answer: CO2 diffuses into leaves through stomatal pores present on the leaf surface.
Answer: The proton (H+) gradient built across the inner membrane drives ATP synthase to make ATP.
Answer: Alcoholic fermentation in yeast releases carbon dioxide along with ethanol.
Answer: High temperature denatures the enzymes of photosynthesis, slowing the reactions even in bright light.
Answer: Anaerobic respiration in muscles produces lactic acid, which can cause fatigue and cramps.
1267
Answer: Respiration is a continuous process and occurs in plants day and night.
1268
Answer: Two ATP are used to phosphorylate glucose before the energy-yielding steps of glycolysis begin.
Answer: Light energy is trapped by chlorophyll and converted into chemical energy stored in glucose.
Answer: Photosynthesis requires light and chloroplasts, which are present in green parts of the plant.
Answer: Roots absorb water from the soil, which is transported to leaves for photosynthesis.
Answer: Glucose loses hydrogen and electrons during respiration, meaning it is oxidized.
Answer: At the compensation point the CO2 fixed by photosynthesis equals the CO2 released by respiration.
Answer: Oxygen comes from the splitting of water during the light reaction, not from carbon dioxide.
Answer: Oxidation is the loss of electrons, which may also involve loss of hydrogen or gain of oxygen.
Answer: Enzymes are biological catalysts that speed up biochemical reactions without being used up.
Answer: Reduction is the gain of electrons, which may also involve gain of hydrogen or loss of oxygen.
Answer: Each glucose produces two molecules of NADH when it is split into two pyruvate molecules.
Answer: Catabolic reactions break down molecules and release the energy stored in chemical bonds.
Answer: Water loses electrons and hydrogen during photolysis, so it is oxidized to release oxygen.