NTA Abhyas NEET2020BotanyTransport in PlantsPractice
How many of the following statements are not correct? [I] In a flowering plant the substances that would need to be transported are water, mineral nutrients, organic nutrients and plant growth regulators. [II] Over small distances, substances move by diffusion and by cytoplasmic streaming supplemented only by passive transport. [III] Organic and mineral nutrients undergo multidirectional transport through the xylem.
Options
- ATwo
- BThree
- CFour
- DFive
Correct answer
A. Two
Step-by-step solution
Statement II and III are wrong. The flow of substances in the xylem is unidirectional and cytoplasmic streaming is caused by a regular change in the structure of cytoskeleton which is an energy-consuming process. Cytoplasmic streaming, also called protoplasmic streaming and cyclosis, is where there is flow inside the cytoplasm. It is typically observed in large plant and animal cells.