• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The tissues main that are found in a mesophytic leaf are epidermal tissue, vascular and ground tissue. The main part of a leaf is the blade of the lamina

Extracts from this document...

Introduction

Biology HL Unit 9 Plant science Yaw Appiah 2009/10/5 Mrs. Fowler The tissues main that are found in a mesophytic leaf are epidermal tissue, vascular and ground tissue. The main part of a leaf is the blade of the lamina; it consists of a large surface area for photosynthesis but is only 0.3mm thick it composes of four thin tissues of layers with veins at intervals. Leaves most important task is photosynthesis that why leaves are flat and wide. So the most important tissue in a leaf is the palisade and the spongy mesophyll. The epidermal tissue is the tissue that surrounds and protects the leaf. ...read more.

Middle

The stoma is situated at the bottom and it pore that allows carbon dioxide to enter and release oxygen. The guard cells are a pair of cells that opens or closes the stomata and controls transpiration of the leaf as it opens or closes pores. Vascular tissue is a complex conducting tissue; it is situated in the middle of the leaf. The tissue transport fluids and nutrients internally within veins and the primary components of a vascular tissue are Xylem and Phloem. Xylem is responsible for the transportation of water and minerals within the plant. It is also used to replace water lost during transpiration and photosynthesis. ...read more.

Conclusion

After the absorption of the water a plant called gibberellins is produced in the cotyledons of the seed. Gibberellin produces an amylase which creates a chemical reaction in digestion with the starch to make maltose in the food stores of the seed. The maltose is transported from the food stores to the growth areas such as the embryo root and the embryo shoot. Maltose is then turned into glucose which is then either used for cell respiration as a source of energy, or its used to synthesize cellulose or the other substances that is needed for growth. As soon as the leaves start to get sunlight, photosynthesis will be used to produce food and the food stores will no longer be needed. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. The Effects of Salinity on Wheat Germination

    1.707012 2.783383 1.212206 Statistical Processing: Formula for average or mean: The mean or average = ______ sum of sample measurements number of samples Formula for standard deviation: S = standard deviation x = each individual value _ X = mean of all measurements = deviation from mean = degrees of freedom Processed using Excel statistics.

  2. Testing the effect of characteristics of leaves on the transpiration rate of * ...

    Figure out the area of all detached leaves by putting them on 1cm squared grid and counting 1cm2 squares. 18. Calculate the volume of water uptake per unit time per unit area 19. Repeat step 1-18 with the rest of other species.

  1. Biology Extended Essay 2009

    In term of relative sweetness, fructose is sweeter than sucrose, which is sweeter than glucose.9 Diagram 110: Shows a disaccharide sucrose molecule that is made up of monosaccharide glucose (left) and fructose (right) molecule. 2.2 Pasteurized orange juice Characteristics Pasteurized orange juice is also known as chilled refrigerated juice and commonly labeled as "not from concentrate".

  2. Identification of Organic Compounds

    Place on a hot plate and heat to boiling. 2. Using the following steps, test each of the substances in a table for the presence of reducing sugars. a. Number clean test tube 1 - 10 b. To each test tube, add 1 mL of substance to be tested c.

  1. Investigating the Effects of Salt on Seed Germination

    germinating 90% of seeds and the highest concentration (2.5%) germinating 0% of the seeds. The scientific reasoning behind this theory is that, seeds need to be able to absorb H2O to grow and germinate. However, salt-NaCl- prevents this from happening as it drags out the water from the seeds, drying them out and preventing their germination.

  2. Examine the correlation between soil moisture at different heights up the slope and the ...

    The independent variable being the variable that is changed in order to deduce whether there is a correlation between soil moisture and Bracken Fern leaf length. The soil moisture will be measured with the soil moisture probe, where it?s inserted into the soil of each of the 7 Bracken Ferns

  1. Finding the isotonic point for potato tissue

    4 + 4.51 - 0.9 + 0.81 5 + 6.43 + 1.02 + 1.0404 6 + 4.88 - 0.53 + 0.2809 Mean = 5.41 = 4.0382 S.D. = ? = ? = 0.82% 1. Discussion : Description : 1. The isotonic point of the potato stick is 0.31 M. 2.

  2. Sleep is a normal part of human life. Investigate the neurobiological basis of normal ...

    The 3 major oscillation systems are sleep spindles, delta oscillations, and slow cortical oscillations. Sleep spindles of stage N2 sleep, are generated by bursts of hyperpolarizing GABAnergic neurons in the nucleus of the thalamus. Delta waves are produced by interactions from both thalamic reticular and cortical pyramidal sources.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work