Question

Mineral crystal raphides are found in:
A. Rubber plant
B. Papaver
C. Sunflower
D. Brinjal

Answer 1

Hint:
We know that the crystals which are like a needle in shape and made of the compound calcium oxalate in the form of monohydrate (commonly called as prismatic monoclinic crystals) are called as Raphides (in singular they are called as raphide or raphis).
We can say that these crystals are also made of calcium carbonate as in the form of aragonite (which are commonly called di pyramidal orthorhombic crystals). According to the research, the scientists say that these raphides are normally found in more than 200 classes of plants present on the earth.

Complete answer:
As we mentioned earlier the raphides are the crystals of mineral crystals that are needled in shape. These raphides can be defined as calcium oxalate and calcium carbonate. These compounds are present in the plants in the form of monohydrate or as aragonite.
Numerous numbers of the plant on the earth such as Ficus or rubber ought to accumulate the crystals of calcium oxalate in response to surplus calcium which is found all over the natural atmosphere.
However, on the other hand, plants like brinjal, papaya, and sunflower have no presence of chemical minerals like calcium oxalate and calcium carbonate. Also, they have no use of these raphides. Thu, such plants will not contain raphides in them.

Thus, the correct answer is option A.

Note: As we already know, the cell walls of the plants, which are in the form of calcium oxalate, carbonate, or silica lead to the formation of mineral crystals. Around a cellulosic core in a few plants, the Calcium oxalate arises in the form of a frame of crystals. In the form of the raphides which in the needle-shaped present in a few plant cells, also shows the presence of Calcium oxalate crystals.
Eg- Water hyacinth.