Tag: roots and leaves

Venation is the arrangement of veins on the leaves. It is basically of 2 types, reticulate and parallel. Reticulate venation involves irregular distribution of veins to form a network. Parallel venation involves the veins running parallel to each other. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. In Canna, the venation is pinnately parallel. 

Venation is the arrangement of veins on the leaves. It is basically of 2 types, pinnate and palmate. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. Castor has palmate type venation of leaf blade. Cosmos is an example of pinnate type venation of leaf blade. Thus, the correct answer is 'Cosmos.'

Compound leaves are of two types, namely pinnately compound leaves and palmately compound leaves. In palmately compound leaf, the leaflets are arranged at the tip of the petiole. It is further divided into 5 types depending upon the number of leaflets present at the tip of the petiole.

In unifoliate, there is only one terminal leaflet is attached at the top of petiole. Example includes citrus.

In bifoliate, two leaflets are attached side by side at the terminal end of petiole. Example includes Balanites roxburghii.

In trifoliate, three terminal leaflets are attached at the terminal end of petiole. Example includes Aegle marmelos.

In quadrifoliate, four leaflets are attached to the tip of petiole. Example includes Paris quadrifolia.

In multifoliate, five or more leaflets are present at the tip of petiole in the form of fingers of the palm. Example includes Parthenium (common weed).

Thus, the correct answer is 'Multifoliate.'