Biology
Plant Transport and Physiology
1,834 Questions
Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.
Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots
Plant Transport and Physiology Questions
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sucrose
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glucose
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resins
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water
C
Correct answer
Explanation
Waste products are stored as resins in old xylem plants. Plants also excrete some waste substances into the soil around them.
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a and b
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b and c
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a and c
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a, b and c
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a only
D
Correct answer
Explanation
This is the correct answer. Plants also use stomata in leaves to excrete gaseous wastes.
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xerophytes
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hydrophytes
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mesophytes
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epiphytes
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none of these
A
Correct answer
Explanation
Sunken stomata are present in xerophytes.
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stomata
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lenticels
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aerenchyma
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hydathodes
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none of these
B
Correct answer
Explanation
In the old and woody stems and roots gaseous exchange occurs through lenticels.
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phloem
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xylem
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suction pull
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transpiration
A
Correct answer
Explanation
In plants, water and minerals are moved upward through suction pull via xylem from the roots to all parts of the plant. Food synthesised in the leaves is transported to all parts of the plant by phloem.
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guttation
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transpiration
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capillary
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root pressure
B
Correct answer
Explanation
The loss of water from the aerial part of the plant during day time is known as transpiration. So, option 2 is correct.
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a only
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b only
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c only
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a and b
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b and c
B
Correct answer
Explanation
This is the correct answer as the small thick leaves minimise water loss from the plant through evaporation.
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surface water
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hygroscopic water
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gravitational water
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groundwater
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capillary water
E
Correct answer
Explanation
Water that remains in the soil after gravitational water is drained out.
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Only P
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Only Q
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Only R
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P and Q
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Q and R
D
Correct answer
Explanation
Xylem is one of the two types of transport tissue in vascular plants. Almost all plant cells produce primary cell walls. The major component of most primary walls in xylem is a disorganized network of cellulose fibrils, which allows the wall to stretch and expand as the cell grows. The secondary wall is deposited on the inner side of the primary wall during and after the cell has elongated or enlarged. The cellulose fibrils in the secondary wall are arranged in a regular fashion with alternating layers at fixed angles to the main axis of the cell. This reinforces the plant cell, while preserving the elastic nature of the primary wall. Most of the cell types in xylem can be distinguished based on the shape and features of the secondary cell wall.
The walls of tracheids are made up of lignin. Xylem parenchyma cells store water, mineral nutrients and carbohydrates, and respond to wounding. Sclerenchyma cells of xylem provide mechanical support, defence and water transport.
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They reproduce both asexually and sexually.
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The rate of evaporation is slow.
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The sporophyte grows as a parasite on the gametophyte.
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The non-vascular plant usually grows in dry places.
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These plants possess rhizoids.
D
Correct answer
Explanation
Non-vascular plants usually grow in moist and shady places. The moist environment is essential for easy uptake of water as they lack the vascular tissues like xylem and phloem.
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yellowing of leaves
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leaf fall and fruit drop
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stunted growth
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localised death of tissues
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all plants
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only C-4 plants
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only yellow coloured plants
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only hydrophytes
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positively geotropic
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negatively phototropic
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not sensitive to gravity and sun
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None of these
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Imbibition
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Transpiration
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Guttation
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Absorption
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Turgor pressure
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Root pressure
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Air pressure
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Osmotic pressure