Question

Hydrostereom or transfusion tissue is found in ________
A. Gymnosperm roots
B. Gymnosperm leaves
C. Gymnosperm stems
D. All of the above

Answer 1

Hint: Hydrostereom is a kind of transfusion tissue that is the transportation channel of the plant body. It helps in conduction of water, minerals and food products through the plant part. It is not common to all plants.

Complete Answer
Hydrostereom or transfusion tissue is found in Gymnosperm leaves. Therefore option B is the correct option. Let's sturdy each of the following options in detail to better understand the concept.
Plants have a vascular system for conduction and transportation various materials throughout the body. Thus, they have a well managed veins system in the form of a system, phloem, tracheids, vessels, etc. Hydrostereom is a substitute of such an authentic vein and veinlets system. However, such a plant still has conventional vascular bundles running throughout the body such as living but non-lignified-parenchymatous cells and lignified tracheid vessels. Since, it is chiefly concerned with carrying out transportation of food in the plant body therefore,is present in the leaves. Such a leaf consists of hydrostereom veins that transport the food manufactured from leaves to other parts of the plant body. This kind of setup is common to gymnosperms (that is seed bearing plants).

So, the correct option is B. Pinus and Cycas are the best examples of plants which have Hydrostereom.

Note:
In such a setup roots are concerned with absorption of water and not transportation of any material. Therefore, option A is an incorrect option. Whereas, Gymnosperm stem is merely a transportation channel for the entire plant body which has all types of vascular tissues. therefore, option C is also an incorrect option.