Multiple Choice
A botanist claims to have discovered a new macronutrient required for plant growth. Most of this scientist's colleagues are skeptical of her claim. Why might they consider it unlikely?
35. Soil
Soil and Nutrients
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Which of the following is a true statement regarding mineral deficiency symptoms in plants?
A
Deficiency symptoms of freely moving nutrients will show up first in younger organs.
B
Deficiency symptoms of immobile nutrients will show up first in older organs.
C
Symptoms of mineral deficiency always show up in older leaves first.
D
Symptoms always show up in younger leaves first.
E
Growing tissues would show signs of mineral deficiency of mobile nutrients after older tissues.
Verified step by step guidance1
Understand that mineral nutrients in plants can be classified as either mobile or immobile. Mobile nutrients can move from older to younger tissues, while immobile nutrients cannot.
Recognize that deficiency symptoms of mobile nutrients will appear in older leaves first because the plant can relocate these nutrients to newer growth areas.
Identify that deficiency symptoms of immobile nutrients will appear in younger leaves first because these nutrients cannot be moved from older tissues to newer ones.
Analyze the given statements: 'Deficiency symptoms of freely moving nutrients will show up first in younger organs' is incorrect because mobile nutrients show symptoms in older organs first.
Conclude that the correct statement is: 'Growing tissues would show signs of mineral deficiency of mobile nutrients after older tissues,' as mobile nutrients are relocated to support new growth, leaving older tissues deficient.
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