Question

Whorled phyllotaxy with simple reticulate leaves occur in
a) Alstonia
b) Guava
c) Calotropis
d) Mustard
e) China rose

Answer 1

In whorled phyllotaxy, quite two leaves arise from the node. It additionally shows straightforward reticulate venation. The whorl kind phyllotaxy is once quite two leaves develop at the nodes and kinda whorl of leaves. The samples of plants of whorl kind phyllotaxy are flower, tulsi, seagull, etc.

Complete answer: 1) These trees will grow terribly massive, like genus Alstonia pneumatophore, recorded with a height of sixty m.
2) The genus Alstonia longifolia is the sole species growing in Central America (mainly shrubs, however additionally trees twenty m high).
3) The foliage is dorsiventral, medium-sized to massive, and disposed oppositely or in a very whorl and with an entire margin.
4) The leaf venation is pinnated, with varied veins ending in a very marginal vein. Phyllotaxy is whorled i.e. 2 or a lot of leaves arise at a node and kinda whorl.
Thus, the correct option is (a).
Additional information:
Alstonia trees square measure utilized in ancient medication. The bark of the genus Alstonia constricta and therefore the Alstonia scholaris may be a supply of a remedy against protozoal infection, toothache, rheumatism, and snake bites. The latex is employed in treating coughs, throat sores, and fever.

Note: In whorled phyllotaxy, quite two leaves occur at a node. This can be seen in the tulsi and kaner plant. In opposite phyllotaxy, the leaves square measure organized in pairs on either aspect of the identical node.