'Chlorosis' takes place when plants are grown in

Correct option is D

The correct answer is (d) Fe-less medium

Explanation:
• Chlorosis is a condition characterized by the abnormal yellowing of plant leaves due to a severe deficiency in chlorophyll.
• It frequently occurs when plants are cultivated in an environment or soil depleted of essential micronutrients, particularly iron (Fe-less medium). Iron is a critical co-factor necessary for chlorophyll synthesis.

Information Booster:
• Deficiencies in other vital elements like Magnesium (Mg), Nitrogen (N), and Manganese (Mn) can also induce visible chlorotic symptoms.
• Since Iron is relatively immobile within plant tissues, iron-deficiency chlorosis typically manifests first in the youngest, newest leaves.

Additional Knowledge:
dark (Option a)
• Growing plants entirely in the dark leads to "etiolation" (plants become pale, elongated, and weak) rather than nutrient-based chlorosis.
shade (Option b)
• Shade affects the rate of photosynthesis and may result in darker, broader leaves adapted to capture limited light, not necessarily chlorosis.
light (Option c)
• Optimal light drives healthy chlorophyll production; it does not naturally cause yellowing unless accompanied by intense heat/scorch.
None of the above/More than one of the above (Option e)
• Incorrect, since an Fe-less medium is directly responsible for classical nutrient chlorosis.

So the correct answer is (d)