Question

Define transpirational pull and root pressure

Answer 1

Vascular plants (from Latin vasculum: duct), also known as tracheophytes (from the equivalent Greek term trachea) and also higher plants, form a large group of plants (ca 308,312 accepted known species [3]) that are defined as those land plants that have lignifiedtissues (the xylem) for conducting water and minerals throughout the plant. They also have a specialized non-lignified tissue (the phloem) to conduct products of photosynthesis. Vascular plants include the clubmosses, horsetails, ferns, gymnosperms (including conifers) andangiosperms (flowering plants). Scientific names for the group include Tracheophyta[4] and Tracheobionta.[5]

Contents  [hide] 1Characteristics2Phylogeny3Nutrient distribution3.1Transpiration3.2Absorption3.3Conduction4See also5References

Characteristics[edit]

Vascular plants are distinguished by two primary characteristics:

Vascular plants have vascular tissues which distribute resources through the plant. This feature allows vascular plants to evolve to a larger size than non-vascular plants, which lack these specialized conducting tissues and are therefore restricted to relatively small sizes.In vascular plants, the principal generation phase is the sporophyte, which is usually diploid with two sets of chromosomes per cell. Only the germ cells and gametophytes are haploid. By contrast, the principal generation phase in non-vascular plants is thegametophyte, which is haploid with one set of chromosomes per cell. In these plants, only the spore stalk and capsule are diploid.

One possible mechanism for the presumed switch from emphasis on the haploid generation to emphasis on the diploid generation is the greater efficiency in spore dispersal with more complex diploid structures. In other words, elaboration of the spore stalk enabled the production of more spores, and enabled the development of the ability to release them higher and to broadcast them farther. Such developments may include more photosynthetic area for the spore-bearing structure, the ability to grow independent roots, woody structure for support, and more branching.[citation needed]

Answer 2

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Hi here's your answer mate

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Root pressure

• the pressure developed in the root which helps in pushing the plant SAP upward is called root pressure

Transpiration pull

• Loss of water from the leaves develop a force which pulls the water from the root to the top of the plant the poles so setup is called transpiration pull .It is very important in case of tall trees