Long Answer Type
Short Answer TypeLong Answer TypeWhy is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?
Short Answer TypePassive mineral absorption : It is the absorption which occurs without expenditure of energy. It occurs by following methods :
(A) Diffusion (B) Mass flow
(A) Diffusion : It is the movement of minerals down the concentration gradient .
Types of Diffusion : It is of Two types as :
(a) Passive Diffusion : It occurs either by dissolving of minerals in matrix cell membrane or through pores. It is a physical process which needs no energy. Water, 02, C02, etc. diffuse by passive diffusion. Sodium in Nitella is absorbed by passive diffusion.
(b) Facilitated diffusion : It occurs by special protein molecules.
(B) Mass flow : Large amount of water is absorbed daily by the plant. Along with the water minerals from soil are absorbed into roots. More the rate of transpiration, more would be water absorption and thus more minerals pass into the roots and then ascend upwards into stem.
Long Answer TypeShort Answer TypeWhich of the following statements are true? If false, correct them.
1. Boron deficiency leads to stout axis.
2. Every mineral element that is present in the cell is needed by cell.
3. Nitrogen as a nutrient is highly immobile in the plants.
4. It is very easy to establish the essentiality of micronutrients, because they are required in traces.
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