FBISE Class 9th (SSC-l)
Explore subjects and practice MCQs
3
Chapters
1,610
Total MCQs
FBISE Class 9th (SSC-l)
Answer: Oxygen and carbon dioxide are exchanged between air and blood in the lungs.
Answer: Breathing is the physical exchange of gases, while cellular respiration is the chemical breakdown of glucose to release energy.
1303
Answer: Reducing pyruvate regenerates NAD+, which is needed to keep glycolysis running in the absence of oxygen.
Answer: Carbon dioxide is a raw material consumed in photosynthesis, not a product of it.
1305
Answer: NADH and FADH2 carry high-energy electrons and hydrogen to the electron transport chain.
Answer: Energy in the form of ATP is one of the main products of aerobic respiration.
Answer: Oxygen is consumed as the final electron acceptor in the electron transport chain.
Answer: The enzymes of the Calvin cycle denature above about 45 degree Celsius, halting the dark reactions.
Answer: Glucose is the main fuel broken down during cellular respiration to release energy.
Answer: Carbon dioxide can only accelerate photosynthesis if light and other factors are available in sufficient amounts.
Answer: Plant physiology deals with how plants carry out vital life processes such as absorption, transport, photosynthesis and excretion.
Answer: Water enters root hairs by osmosis because the root hair cell sap is more concentrated than the soil water.
1313
Answer: Xylem conducts water and dissolved minerals upward from the roots to the leaves.
Answer: Root hairs are extensions of root epidermal cells that greatly increase the surface area for absorption.
Answer: Transpiration is the loss of water vapour, mainly through the stomata of leaves.
Answer: Dixon and Joly proposed the cohesion-tension theory to explain the upward movement of water in xylem.
1317
Answer: Cohesive forces between water molecules and adhesion to the xylem walls keep a continuous water column.
Answer: Most stomata are found in the lower epidermis of leaves where they allow gas exchange.
Answer: Carbon dioxide diffuses into the leaf through stomata and is used to make glucose in photosynthesis.
Answer: Evaporation from leaves creates tension; the pull is transmitted along the water column and water rises.