Stelar system in Lycopodium​

Explanation:

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I didn't understand the question..but here is the definition

Explanation:

Definition of Stelar System:

According to the older botanists, the vascular bundle is the fundamental unit in the vascular system of pteridophytes and higher plants. ... Thus the stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products