Biology
Plant Transport and Physiology
2,012 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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transpiration
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translocation
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excretion
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circulation
A
Correct answer
Explanation
Transpiration is the process where water evaporates from the stomata in leaves and other aerial parts of a plant. This process helps in the ascent of sap and cooling the plant.
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leaves
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shoots
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roots
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flowers
C
Correct answer
Explanation
Roots absorb water and dissolved minerals from the soil through osmosis and active transport. These substances are then transported upward to the rest of the plant through the xylem tissue.
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sugar
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fat
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potassium
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lipid
A
Correct answer
Explanation
Translocation is the movement of organic solutes like sucrose (sugar) through the phloem. This process requires energy in the form of ATP to load the sugar into the sieve tubes against a concentration gradient.
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Cutin
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Suberin
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Sclereid
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Lignin
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Cambium
B
Correct answer
Explanation
Suberin is a complex polymer present in the wall or cork cells. It makes cell wall impervious to gases and water. Thus, this is the correct answer.
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Stem absorbs the water and minerals from the soil.
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The number of petals and filaments in a flower are equal.
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Roots conduct the water to the leaves.
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The ovary of a flower contains stigma.
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The pattern of veins on leaves is called venation.
E
Correct answer
Explanation
This is the correct choice. The pattern of veins on leaves is called venation.
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As a link between roots and other parts of the flower.
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As a path for the conduction of water and minerals absorbed.
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As a producer of food for the plant.
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As a support for holding the plant upright.
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As a bearer of flowers and fruit.
C
Correct answer
Explanation
Yes, it is the correct answer. This is not a function of the stem. Leaves are the food factories of the plants.
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only a
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only b
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only c
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a and b
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b and c
C
Correct answer
Explanation
This is the correct choice as this statement is incorrect. The cactus stores water in its stem.
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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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a, b and c
E
Correct answer
Explanation
This is correct. Leaves perform all these functions.
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Killing and fixation
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Dehydration
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Moistness
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Embedding
B
Correct answer
Explanation
In this stage of cell preparation, water vapour is removed from cells or tissues using chemical agents.
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carbon dioxide in the air spaces in the leaf decreases
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oxygen in the air spaces in the leaf increases
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C3 plants carry on photorespiration using oxygen and produce PGA and carbon dioxide
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all photosystems as well as photorespiration come to a halt
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1, 2 and 3 are correct
E
Correct answer
Explanation
When stomata close, gas exchange stops, leading to a decrease in CO2, an increase in O2 (due to light reactions), and the initiation of photorespiration in C3 plants.
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Compact mesophyll cells in the leaf
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Increase in the number of stomata
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Thick cuticle surrounding the outermost parts of the plant
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All of the above
B
Correct answer
Explanation
Stomata are the pores through which transpiration occurs. Increasing the number of stomata would increase the rate of transpiration, not reduce it.
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Long roots
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Green stems
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Thin and hard stems
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Thick waxy coating on stems
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Leaves reduced to spines
C
Correct answer
Explanation
This is the correct option as this is not an adaptation of cacti plants. Stems become spongy so as to store water.
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Defense
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Conserve loss of water
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Floating over the surface of water
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To prepare food for the plant
B
Correct answer
Explanation
The function of leaves with large parenchymatous cells and a big central vacuole is to prevent the loss of water.
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stem
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flower
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scale leaves
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leaves
C
Correct answer
Explanation
The thick and fleshy part of onion, which stores water and food, are scale leaves.
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defense
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absorption
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support
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storage
D
Correct answer
Explanation
The leaves of Aloe are modified to perform the function of storage.