Q. Which one of the following statements are true? I.If the stem is joined with solid nodes and hollow internodes, it is called caudex. II.In Tridax, the stem is decumbent. III.Corm is a condensed from of rhizome growing more or less in vertical direction. IV.Sucker is an underground modification of stem. V.Biparous type of cymose branching is seen in $Saraca$.
A) I, IV and V
B) II and III
C) II, III and V
D) III and IV
Explanation
In caudex, only the terminal bud functions and lateral buds remain dormant. The plant thus, has only terminal crown of leaves, e.g., palms Decumbent stems have branches which after growing horizontally for some length, grow vertically upward, e.g., Tridax, Portulaca. Sucker is the sub-aerial modification of stem. They grow obliquely upward from the main stem producing roots from the under ground nodes, e.g., Mentha. Saraca shows helicoids type of uniparous cymose branching.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.