Multiple choice

Raphids are needle-like crystals of calcium oxalate, which are especially common in

  1. rose

  2. pistia

  3. dahlia

  4. asparagus

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Crystals of some minerals are found as excretory products of plants. These crystals are made up of calcium oxalate and are found in storage tissues, e.g., pith and cortex. They may be rodlike, prismatic, pyramidal, rhomboidal or needle-like. The needlelike crystals are called raphides.