RRB RPF RPSF SI and CONS Model Papers 10 with solutions

(1) The pattern of arrangement of leaves on the stem is called Phyllotaxy. As a stem grows at its apex, new leaf buds form along the stem by a highly controlled developmental process.
Leaf arrangement along the plant stem depends on the species and is an important identifying characteristic. There are four basic types of phyllotaxy: alternate, spiral, opposite and whorled.