Important Questions of Transport in Plants for NEET Free PDF
FAQs on Transport in Plants Important Questions and Solutions for NEET
1. What differences can be marked between diffusion and osmosis?
Osmosis is said to be the moving of solvent particles with the help of a semipermeable membrane that goes from a strictly dilute solution to a concentrated solution. Whereas in Diffusion, particle movements tend to take place from higher concentration to lower concentration. One major difference between these two is that in diffusion, both the particles of solvent and solute are free to move. But in Osmosis, the molecules which cross the whole membrane are only water molecules.
2. What is water potential?
Water potential is the amount of energy that is required per quantity of water. For photosynthesis to take place, water potential is used by plants to transport the flow of water to the leaves of the same. In a plant cell, water potential is negative whereas the same in distilled water is absolute zero. It is important in the plant system because of its nature of determining the movement of water as well as its direction.
3. Why do the guard cells open and close during transpiration?
Guard cells are special plant cells present in the stomatal openings where there is a change of gas taking place. To regulate the flow and amount of water within the stomata, guard cells open and close the surface of the same. The pores of stomata are at their fullest capacity and guard cells swollen when there is an abundance of water available, whereas the same pores are closed and guard cells lose when there is a scarcity for the same.
4. What are porins?
For molecules to carry forward diffusion, it needs proteins which are called Porins, which cross the entire cellular membrane and hence work as a pore itself. Porins are not like other membranes which work for the transportation of proteins one by one simultaneously, rather it chooses a bigger diffusion panel because of its size and can carry different types of molecules within. Porins are present in the outer membrane of gram-positive and gram-negative mycobacteria, and also in mitochondria.
5. Mention a few of the factors affecting the rate of diffusion.
Several factors are responsible for the rate of diffusion which includes the concentration of gradient, temperature, and the cell membrane's surface area which are separating the two areas for diffusion to take place. In the concentration of gradient factors, the larger the difference in concentration, the faster is the rate of diffusion. Also, in temperature, particles will have more kinetic energy concerning a higher temperature, hence they will diffuse quickly.