Tag: transpiration

Infiltration is downward entry of water into the soil whereas percolation is the downward flow of water through soil. Percolated water reaches deep in the soil to water table. Percolation of water first occurs through macropores that are bigger than 50 micron. These are present between soil particles and microspores. Later, percolation occurs through microspores.

During night, the dried soil surface becomes wet. This is due to the water droplets that forms a thin layer due to condensation. This is called as night recovery. As the soil surface cools at night by radiating its heat, moisture present in the atmosphere condenses. This results in the formation of water droplets on the soil. At night as the air cools to the dew point, condensation occurs and soil becomes wet without rain.

During night, the dried soil surface becomes wet. This is due to the water droplets that forms a thin layer due to condensation. This is called as night recovery. As the soil surface cools at night by radiating its heat, water vapour present in the atmosphere condenses. This results in the formation of water droplets on the soil. At night as the air cools to the dew point, condensation occurs and soil becomes wet without rain.

Dry atmosphere means lack of moisture content in the air. Due to this, air has a lot of capacity to hold water and thus the rate of transpiration increases.

• Water loss from the leaves in the form of water vapour through the openings called stomata is called transpiration.
  
• Imbibition is a phenomenon that refers to the absorption of one substance by another, usually uptake of water by a plant or a seed.
  
• Guttation is excretion of xylem sap on the tips of some plants through pores called hydathodes.
  
• Translocation is the movement of the material from the source to sink inside the plant. Example, movement of starch from leaves to roots or other plant parts.
  

In soil rich in moisture content water floods a plant root system. Leaves can retain only a finite amount of water. Excess water i.e xylem sap from the roots is given out through pores or edge of leaves in the form of droplets. This process is called guttation. As this water contains different organic and inorganic substances from the plant it is considered impure. Also, guttation is of universal occurrence. Thus the correct answer is option C.

Guttation is the phenomenon of the release of small water droplets from the pores of the plants. It is done in order to release the extra water out of the plant in very humid conditions. It is commonly seen in mesophytes.

Hydathodes release water in the form of small water droplets and hence are responsible for guttation.

Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface. At night, transpiration usually does not occur because most plants have their stomata (pores found in the epidermis of leaves, stems and other organs that are used to control gas exchange)closed. So the correct option is ' Mirabilis’.