Transport in Plants Test - 83

The sugar molecules are transported by the conducting cells in the phloem tissue in the form of sucrose. These sugar molecules are transported from the source end to the sink end. The source end is the region where the sugar is present in high concentrations. The sugar needs to be moved in the sieve elements in the source end by the process of sieve elements. Energy needs to be spent to move the sugar molecules in the form of ATP. The sugar molecules are transported through osmosis and removed from the sieve cells in the sink end by active transport. 

The sugar molecules are transported by the conducting cells in the phloem tissue in the form of sucrose. The source end is the region where the sugar is present in high concentrations. The sink end is the region where the sugar is present in low concentrations. The leaves are the site of photosynthesis which acts as the source end. The roots and the developing seeds cannot perform photosynthesis and are considered as sink end. These sugar molecules are transported from the source end to the sink end.

• The process in which there is the exudation of water in the form of droplets is known as guttation. 
• There is a loss of water in the water drops. This is the phenomenon that is found in humid and cold environments especially during the night. There are special glands called as hydathodes.
• These are responsible for the guttation. These are called as chalk glands because calcium salts are deposited on these glands.
• The process of transpiration is the loss of water in the form of water vapor.

The mechanism which is used to transfer the sugar in phloem from source end to the sink end is called as the pressure flow mechanism. The sugar molecules are transported by the conducting cells in the phloem tissue in the form of sucrose. These sugar molecules are transported from the source end to the sink end. The source end is the region where the sugar is present in high concentrations. The sugar needs to be moved in the sieve elements in the source end by the process of sieve elements. Energy needs to be spent to move the sugar molecules in the form of ATP. The sugar molecules are transported through osmosis and removed from the sieve cells in the sink end by active transport. 

Osmometer is a device which measures osmotic pressure of any solution or colloid.

The absorption of water by the solid particles of an adsorbent increases its volume and does not form a solution. This process is called imbibition. The swelled imbibant (i.e., the solid substances or adsorbents which take part in imbibition e.g., seeds, dry wood.) also develops a pressure called imbibition pressure, which is also called as matric pressure.

Root exudates function in below ground plant defence. Plant roots are constantly exposed to a variety of natural enemies, including pathogenic microorganisms and root-feeding arthropods. These organisms inhabit the soil surrounding the root system, which is designated the rhizosphere. 

Chemicals secreted into the soil by roots are referred to as root exudates. By doing this root changes the chemical and physical property of soil and inhibit the growth of other plant species. Root pressure can be demonstrated by means of exudation or bleeding caused due to root pathogens.

so the correct answer is 'Exudation'.