Q. Study the following pairs. I. Modified - Unisexual - Chalazal aerial stem flowers entry of Develop pollen tube Acropetally II. Flowers - Pedicels of all - Presence of achlamydeous the flowers false whorl are of same Length III. Cohesion of - Centrifugal - Male flowers Bracts opening of many forming a cup flowers IV. flower - Presence of - terminal part Formation on rachilla of the peduncle One side in a is flowerless Spiral manner Select the correct pair of answers in which the former represents the set of characters present in poinsettia and the latter in the pair represents the set of characters present in casuarina.
A) II and III
B) I and II
C) IV and III
D) III and I
Explanation
In $Poinsettia\ and\ Euphorbia,\$inflorescence is cyathium, in which involucre fuse to form a cup surrounding a large achlamydous, pedicellate, tricarpellary, syncarpous female flower. Numerous centrifugally arranged male flowers surround the female flower.numerous centrifugally arranged male flowers surround the female flower. In $Casuarina,$cylindrical phylloclades are found which are modified aerial stems. Flowers are unisexual which develop acropetally and pollen tube enters the ovule through chalazal tissues$,\ i.e.,$ chalazogamy.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.