FBISE, NCP & NBF-aligned resources for Classes 9–12
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Biology Chapter 8 : Test Yourself
1 / 10
Chlorosis does not occur due to the deficiency of
Reasoning: Chlorosis (yellowing of leaves due to lack of chlorophyll) is commonly caused by deficiencies of magnesium, sulphur, and nitrogen, but not typically by calcium deficiency.
2 / 10
Most of the uptake of water and minerals from soil takes place through
Reasoning: Root hairs provide a large surface area for efficient absorption of water and mineral salts.
3 / 10
Sugar transported through phloem is mostly in the form of
Reasoning: Plants transport food through phloem mainly as sucrose, the principal transport sugar.
4 / 10
Which category of plants stores a small amount of water and has a thin cuticle?
Reasoning: Hydrophytes live submerged in water, storing minimal moisture and using a thin cuticle to absorb nutrients directly.
5 / 10
What is a key role of leaves in managing waste in plants?
Reasoning: Plants often store waste products in leaves, which are later shed to remove the wastes.
6 / 10
When the rates of photosynthesis and respiration become equal, which pattern of gaseous exchange occurs between the plant and its environment?
Reasoning: At the compensation point, photosynthesis and respiration occur at equal rates, resulting in no net gaseous exchange.
7 / 10
What is the role of companion cells in the translocation process?
Reasoning: Companion cells load sucrose into sieve tubes using active transport.
8 / 10
What drives the translocation of organic solutes in plants?
Reasoning: Pressure gradients created by differences in sugar concentration drive translocation through phloem.
9 / 10
According to the TACT theory, what are the four factors that work together to move water and minerals up a plant?
Reasoning: TACT stands for Transpiration pull, Adhesion, Cohesion, and Tension, which explain water transport in xylem.
10 / 10
What drives the bulk flow of water to the top of the plant according to the TACT theory?
Reasoning: Evaporation of water from leaf surfaces creates a transpiration pull that draws water upward through the xylem.
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