Plant hormones are specialized chemical substances produced by plants. They are the main internal factors controlling growth and development. Hormones are produced in one part of a plant and transported to others‚ where they are effective in very small amounts. Depending on the target tissue‚ a given hormone may have different effects. Plant hormones play an integral role in controlling the growth and development of plants. A plant hormone is generally described as an organic compound synthesized
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Nabila Anika • Vascular plants-plants with vascular tissue; pteridophytes‚ gymnosperms‚ and angiosperms; includes all modern species except the mosses and their relatives • Vascular tissue-plant tissue consisting of cells joined into tubes that transport water and nutrients throughout the plant body • Pteridophytes-seedless plants with true roots and lignified vascular tissue; ferns‚ horsetails‚ and whisk ferns • Bryophytes-nonvascular plants; lack water conducting tissues and
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Patterns in Nature 1. Organisms are made of cells that have similar structural characteristics * Outline the historical development of the cell theory‚ in particular the contributions of Robert Hooke and Robert Brown Robert Hooke was the first person to observe a cell through a compound microscope in 1665. Franscesco Redi used a microscope to observe that flies do not spontaneously appear but develop from eggs laid by other flies. Many years later‚ Robert Brown observed a large body in
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Which is the cytoplasm of specialized cells known as laticifers that are associated with the phloem (phloem is the living tissue that carries organic nutrients) throughout the plant. (Onoyovwe‚ et al.‚ 2013) The traditional method for the separation of the latex starts by cutting the unripe seed capsules of the poppy plant and collecting the latex‚
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It has a carbon backbone of C15 and is formed after carotenoids‚ pigments produced by the chloroplast which have 40 carbons in MEP during biosynthesis. Zeaxanthin is the first ABA precursor. The transport of ABA can occur in both xylem and phloem tissues. It can also be translocated through paranchyma cells. The movement of abscisic acid in plants does not exhibit polarity like auxins. ABA is capable of moving both up and down the stem What is Abscisic Acid (ABA)? Absiscic Acid is the
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inside wood of the tree. Trees actually have inner bark and outer bark -- the inner layer of bark is made up of living cells and the outer layer is made of dead cells‚ sort of like our fingernails. The scientific name for the inner layer of bark is Phloem. The main job of this inner layer is to carry sap full of sugar from the leaves to the rest of the tree. A number of handy things are made from bark including latex‚ cinnamon and some kinds of poisons. Because bark is a protective layer for the
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Paper 1 Chapter 1: Cell structure May/June 03 1 An actively growing cell is supplied with radioactive amino acids. Which cell component would first show an increase in radioactivity? A Golgi body B mitochondrion C nucleus D rough endoplasmic reticulum 2 Which pair of organelles has internal membranes? A chloroplasts and mitochondria B chloroplasts and nuclei C mitochondria and ribosomes D nuclei and ribosomes 3 Which combination is found in a prokaryotic cell? Endoplasmic reticulum DNA RNA Nucleus
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MULTI CHOICE QUESTIONS BIOLOGY 1. First living cells were observed by A) Robert Hooke B) A.V Leeuwenhoek C) Robert Brown D) R.Virchow 2. Well defined nucleus is absent in A) Plant cell B) Animal cell C) Eukaryotic cell D) Prokaryotic cell 3. Which of the following is incorrect pair A) Nucleus-Brain of the cell B) Mitochondria-Power house of the cell C) Chloroplast-Kitchen of the cell D) Lysosome-Secretory granules
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Cohesion Phenomenon of intermolecular forces holding particles of a substance together. Cohesion differs from adhesion in being the force of attraction between adjacent particles within the same body; adhesion is the interaction between the surfaces of different bodies. The force of cohesion in gases can be observed in the liquefaction (condensation) of a gas‚ which is the result of a number of molecules being pressed together to produce forces of attraction high enough to give a liquid structure
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Topic 1: The building blocks of cells Lesson Specification learning outcomes Prior learning from KS3 HSW statements BTEC Links Lesson B2.1 Plant and animal cells 1.2 Describe the function of the components of a plant cell including chloroplast‚ large vacuole‚ cell wall‚ cell membrane‚ mitochondria‚ cytoplasm and nucleus Year 9 Explain‚ using a range of models and analogies‚ how the specialised cells and tissues involved in movement and support are adapted to their function‚ e.g. muscle cells
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