The leaf construction and organisation of a plant is designed to provide a plant with the most surface area potential for gasolene exchange and exposure to sunlight . But the body structure of leaves also helps botanists and horticulturalists draw and place one plant from another . Bean plants are a group of legume species that have similar works structure , specially in the leave .

Types of Beans

Many legume are commonly referred to as beans , include green beans , kidney beans , fava beans , red and black bean , chickpeas ( or garbanzo beans ) and soybeans . There are also many plants or intellectual nourishment referred to as bean that are not actually legumes , and whose folio social system is entirely dissimilar . These include castor bean , coffee bean attic and vanilla extract noggin .

Leaf Arrangement

When a plant has three or more leaves arranged on a stem that shoots off of the main shank , then it is anticipate compound leafage arrangement . round-eyed leafage musical arrangement have only one leafage on these stems . bonce plants typically have three leave on these side staunch , where two leaves are opposite each other and the third is at the tip of the branch stem .

Edges and Shape

The edges of attic plants are smooth , with no serration , ' teeth ' or curve ( called lobes ) . Botanists call this boundary ' entire . ' Most have a leaf frame that looks like the one of spade in a card deck of cards . This means that the base is cordate , or heart - influence . The tips of string bean plant leaf be given to be acute ( slightly pointed ) or , as in the case of soya bean , acuminate ( sharply bespeak ) .

Internal Structure

The top and bottom of bean leaves are covered in a protective shell that restricts air flow , helps foreclose tan and foreclose excess water loss . Below this stratum is the epidermis , which also do as a protective layer while make out gas interchange . On the top side of the leaf , just below the cuticle , is a mesophyll layer . This is the layer where most of the photosynthesis takes spot . Nestled below that layer are the various other mathematical function of the leaf , notably the veins that hold the xylem ( water rapture ) and phloem ( nutrient shipping ) .

Considerations

To get the most from beans , they should be establish where the leaves meet full sunlight , or at least six hours of direct sunlight per daytime . The shell help keep suntan in these weather condition , and it allow the mesophyll stratum to develop as much starch for the growing seed fuel pod ( the comestible bean plant ) as possible . While it is potential to fertilize bean through the leave with foliar provender , this is nearly as effective as provide rhizobia bacteria for the ascendant . These microbes attach to the roots , and become atmospherical nitrogen into a rich food source for legumes such as beans .

References

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