decreased the amount of water lost. The dark condition had the lowest average water loss per day because transpiration requires some type of starter source (like light or wind) for water to travel from the roots of the plant to the stomata of the leafs. 1. For this experiment‚ what were the independent variable and the dependent variable? What were the constants? The environmental factors that you are testing on the rate of transpiration are the independent variable of this experiment. These
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Introduction to Histology Introduction Histology is the microscopic study of cells and tissues of organisms. This study is important in the overall understanding of anatomy and physiology of organisms. It helps to understand the structures and functions of various tissues that make up bodily organs and systems (Wendy Wright‚ 2014). The cell theory states that a cell is the fundamental biological unit. All living organisms are composed of one or more cells‚ and every bodily activity that takes
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regards to light‚ keeping the leaf cool. For example‚ Lithops live in the deserts of South Africa‚ Namibia and Botswana. Sunken stomata: By sinking the stomata deeper into the epidermis‚ the plant can retain a moist atmosphere there by being partially covered by the cuticle and hairs called trichomes. They prevent dry air evaporating more water than necessary. The adaptation also allows the plant to keep its stomata open for longer and take in more CO₂. Leaf rolled with stomata inside: The
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difference between monocots and dicots 3 differences between monocots and dicots 1. Monocots have parallel venations along their leaf 2. Dicot roots have X-shaped xylem whereas monocots are organized into a ring 3. Dicot stem xylem form a ring around the outside whereas monocot xylems are scattered 9.1.3 Distribution of tissues in leaves and functions In the leaf you have xylem and phloem tissues. Xylem tissues act like transport tubes‚ transporting water and minerals. Phloem tissues are used
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halepensis needles also have much tighter stomata closure and stomata are the pores that allow air and water to pass in and out of the needle‚ then the hypothesis is proved correct. If there is no obvious difference between two kinds of leaf‚ then the small leaf may serve other functions. Citation Salisbury‚ Frank B. and C.W. Ross. 1978. Plant Physiology‚ second edition. Wadsworth Publishing Company‚ Belmont‚ CA. 422
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In the cross section of a young root of Helianthus‚ the epidermis is uniseriate. 6.1 What do you call the outgrowths of the epidermis? These are called trichomes. 6.2 What is their function? They function mainly for support and protection of the leaf or stem which contains the epidermis. 6.3 Classify the types of epidermal outgrowths in the above plants. bristle | scale | simple hair | glandular | branching | stellate | 7.1 Draw and identify the tracheary elements. reticulate | annular
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potential from the stem to leaf in the experimental plant? 5. What is the advantage to a plant of closed stomata when water is in short supply? What are the disadvantages? 6. Describe several adaptations that enable plants to reduce water loss from their leaves. Include both structural and physiological adaptations. 7. Why did you need to calculate the % water loss each day instead of graphing the total amount of water lost each day? 8. Draw a plant leaf cross section and label the
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and the fan will lose a larger amount of water. Then the hypothesis can be factors that increase evaporation will increase transpiration. Plants transpire actively in the light than in the dark‚ lights also speeds up transpiration by warming the leaf. ranspiration is the loss of water from a plant. Plants transpire water out of the stomata in their leaves at a different rate in every environment. The amount of transpiration is affected by the environment‚ how developed the plant is to not lose
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above equation‚ it can be seen that light energy plays the role as the source of energy stimulating the process of photosynthesis. The main pigment that absorbs light energy is chlorophyll which is the green pigment found inside chloroplasts. A green leaf cut out into discs of the same size are used in this experiment. This experiment is carried out to discover how different intensity would affect the rate of photosynthesis. Hypothesis : As light intensity increases‚ the rate of photosynthesis increases
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General Information Practical Work Assessment Guide Table of Summary of Experiments Determination of osmotic potential Use of microscope‚ magnification‚ and measurement of cell size Observation of cells (a) animal cell: cheek cell (b) plant cell: leaf epidermis cell Enzyme activity Separation of photosynthetic pigments using paper chromatography Examining slides of transverse sections of C3 and C4 leaves Use of yeast in respiratory experiment Dissection of the mammalian digestive system Dissection
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