Which Is an Essential Trace Element in Plants

question 25

Multiple Choice

Which is an essential trace element in plants?

• A) iron
• B) phosphorus
• C) copper
• D) sulfur
• E) nitrogen

---

Definitions:

Trichromatic Theory

A theory explaining human color vision based on three types of cones sensitive to blue, green, and red wavelengths.

Receptors

Specialized cells or proteins that detect and respond to chemical signals, such as hormones or neurotransmitters.

Red

A primary color that can be perceived by the human eye and is often associated with meanings of love, danger, or warning.

Green

Often associated with environmental sustainability, the color green symbolizes growth, harmony, and freshness, and is linked with initiatives to protect the natural environment.