Idiosomes in plant cells
A)Synthesize cell wall material
B)Possess digestive enzyme
C)Represent a collection of ribosomes
D)Show heteropycnosis

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Hint: An allosome is a sex chromosome that in shape, size and behavior, varies from an ordinary autosome. Allosomes are also known as sex chromosomes or idiosomes.

Complete answer:
Heteropycnosis is a chromosome-shown phenomenon in which some chromosome regions stain more deeply than others. As defined by Heitz (1928), the regions that exhibit heteropycnosis can be said to be composed of heterochromatin and called as heterochromatic components against the other components, which never exhibit heteropycnosis and are called as euchromatic components. Some sex chromosomes are tightly coiled and made up of heterochromatin.

Let us analyze the options to find out the correct option.
Option A: Cell wall material is synthesized by Golgi apparatus in plants. Therefore, this is an incorrect option.

Option B: The digestive enzymes are possessed by lysosomes in plants. Therefore, this is an incorrect option.

Option C: Idiosomes do not have a collection of ribosomes. Therefore, this is an incorrect option.

Option D: Idiosomes show heteropycnosis. Therefore, this is the correct option.

Hence, the correct answer is option (D)

Note: 1.The heterochromatic regions show heteropycnosis.
2.Heterochromatin is responsible for regulating chromosome metabolism, nucleic acid synthesis, etc.
3.There are two types : positive and negative heteropycnosis.
4.In positive, heterochromatin regions appear more darkly stained and thicker than euchromatin regions while it is opposite in case of negative heteropycnosis.