Q.
Four coleoptile for experiment
Which coleoptile bend toward the light? Choose the correct option
A) $A$ and $B$
B) $C$ and $D$
C) $A$ and $D$
D) $C$ and $B$
Explanation
Phototropism is the movement of coleoptile (plant organ) towards the light (due to auxin) Figure 1 shows incomplete blockage of auxin, but direction of blockage does not favour the bending of coleoptile towards the light source Figure 2 shows in complete blockage of auxin movement from apical part to lateral part. So, no bending of coleoptile is there Figure 3 shows incomplete blockage, but the direction favours the bending of coleoptile towards the source Figure 4 shows no blockage hence, the bending of coleoptile takes place easily
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.