Question
What are the limitations of root pressure theory?
✓
Answer
Although the ascent of sap takes place due to root pressure, there are certain objections raised, such as -
- It is not applicable to plants taller than 20 meters.
- Ascent of sap can also occur even in the absence of a root system.
- The root pressure value is almost nearly zero in taller gymnosperm trees.
- In actively transpiring plants, no root pressure is developed.
- Xylem sap under normal conditions is under tension, i.e. it shows negative hydrostatic pressure or high osmotic pressure.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
It is generally observed that the number of male gametes produced is several thousand times the number of female gametes. Explain.
Explain Homologous and Analogous organs with example.
$p^2 + 2 pq + q^2 = 1$. Explain this algebraic equation on the basis of Hardy Weinberg’s principle.
→Write the sex chromosomal complement of the following:
Expand the following and explain any one of them:
- IVF
- ZIFT
- MTP
Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?
Implantation.
What is obsessive-compulsive disorder? How is it different from borderline personality disorder? What are the two most common obsessions that affect adolescents?
How will you classify man as carnivore (primary/ secondary) or omnivore? Why?
Describe the experiments that established the identity of 'transforming principles' of Griffith.