Question

Define:
i) Radial Vascular Bundle
ii) Rigor Mortis
iii) Root pressure

Answer 1

The vascular bundle is the arrangement of conducting vessels in the stems or leaves of the plant. Rigor Mortis here additionally referred to as post-mortem rigidity. The root pressure is the force that is responsible for carrying fluid to xylem and phloem against the gravity in smaller plants.

Complete answer: 1) Radial Vascular Bundle: Radial vascular bundle is a straight forward arrangement of xylem and phloem where they both lie alternately and separately on different radii by non conductive tissues. Here the xylem lies towards the periphery. In between xylem and phloem are present in parenchymatous cells. Radial vascular bundles are found in both monocots as well as digits. The presence of a radial vascular bundle is considered to be a characteristic feature of roots.
2)Rigor Mortis: Rigor Mortis is a condition where the muscles in the body of a person stiffens after his/her death also commonly called post mortem rigidity. It is the result of a biochemical change in the muscles a few hours after death. Rigor Mortis tells us the time from death and also if the body has been moved after death. This occurs because the hydrolysis of ATP occurs within the muscles. There are no ATP molecules of myosin stick to the actin filaments making the muscles rigid.
3) Root pressure: Root pressure might be outlined as a force or the fluid mechanic’s pressure generated inside the roots that facilitate in driving the fluids and completely different ions from the soil in upwards directions. This method is created by pressure within the cells of the basis. Root pressure is additional common throughout the spring seasons before the leaves develop and also the rate of the transpiration is fast. The effect of root pressure is seen solely throughout nights and within the early morning because the rate of evaporation is extremely low.

Note: In the vascular bundle, the xylem is separated from the phloem by vascular calcium but this in digits only. The monocots have a closed vascular bundle that is not present in those vascular bundles. Root pressure does not do a major job of water transport in most plants as it is done by the transpirational pull of the plant. They do not play the main role in the movement of water in an upward direction in tall plants.