Practical guide to detection and identification of Phytophthora Leaf blight A number of Phytophthora species cause leaf blight. These include: P. infestans on potato and tomato; P. palmivora on a large number of tropical fruit species including rubber‚ durian and macadamia; and P. colocasiae on taro. These blights on leaves are first seen as small flecks but within 3-5 days they expand to produce large lesions. Initially‚ infected tissue is water soaked but becomes necrotic (brown or black) in
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Title: Transpiration Aim: To study the significance of the pattern of stomatal distribution in Coleus and Lucky bamboo leaf Theory: Transpiration is the loss of water vapour from the surface of the plants due to evaporation. Transpiration can help the uptake of water in the xylem due to transpiration pull. During transpiration‚ mesophyll cells lose water continuously to the air space. This decreases the water potential of the mesophyll cells. Water is then drawn from their neighbouring cells
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down towards the roots of the plant. Match the adaptations of the marram grass leaves with their function Waxy Cuticle Reduce water loss through transpiration Stomata sunk in pits Trap a layer of moist air close to the leaf surface Leaf
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develops many side branches that are not productive. There are new leaves growing in branches. The size of the leaves increases lengthwise and breadthwise. Leaves are oval in shape‚ deeply and palmately 4-7 lobed‚ serrated margins‚ cordate at base‚ leaf tip acute or obtuse. 1.4.3 Flowering stage: In flowering stage yellow dioecious flowers usually appear in 5 to 6 weeks. The male and female flowers are borne separately on the same plant and male flowers normally exceed the females by about 25:1. -
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were splitting and the spindle fibres were very noticeable. Conclusion: Answer question 3 on page 49 3. The white fish embryo and alliums root slides were used to study mitosis instead of human bone and plant leaf because it was easier to obtain. This does not apply to the plant leafs but I’m guessing that the white fish embryo and alliums root slides have a faster mitosis rate than the plant
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TRANSPIRATION: Investigation 11 Learning Objectives: To investigate the relationship among leaf surface area‚ number of stomata‚ and the rate of transpiration To design and conduct an experiment to explore other factors‚ including different environmental variables‚ on the rate of transpiration To investigate the relationship between the structure of vascular tissues (xylem and phloem) and their functions in transporting water and nutrients in plants Before doing this laboratory you should understand:
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The natural world is extremely varied‚ so an easier way biologists and people can better understand the Earth’s environment and its ecosystems is to categorize it into groups called biomes. Biomes are arranged by specific environmental conditions (i.e. rainfall‚ temperature‚ and humidity) and house specific types of vegetation or factors that allow organisms adapt to these environments. Cataloguing organisms that share similar adaptations makes it easier to study all the environments found on Earth
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Characteristics that uniquely identify plants: they are autotrophic‚ non-motile‚ they are photosynthetic‚ contain chloroplast‚ perform alternation of generations‚ plants are deciduous or evergreen‚ and the type of leaf and stem structure they have (http://wiki.answers.com/Q/What_characteristics_do_all_plants_share). Most plants are autotrophic‚ meaning they are capable of producing their own food and nutrients themselves‚ synthesizing their own food from inorganic substances‚ by using light or
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leaves are colonies formed by rosettes that have divided beneath the ground. Illustration from Curtis’s Botanical Magazine by William Curtis (1746–1799) The leaf blade is divided into two regions: a flat‚ heart-shaped photosynthesis-capable petiole‚ and a pair of terminal lobes hinged at the midrib‚ forming the trap which is the true leaf. The upper surface of these lobes contains red anthocyanin pigments and its edges secrete mucilage. The lobes exhibit rapid plant movements‚ snapping shut when
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stems‚ etc. The parts of a typical leaf include the upper and lower epidermis‚ the mesophyll‚ the vascular bundle(s) (veins)‚ and the stomates. The upper and lower epidermal cells do not have chloroplasts‚ thus photosynthesis does not occur there. They serve primarily as protection for the rest of the leaf. The stomates are holes which occur primarily in the lower epidermis and are for air exchange: they let CO2 in and O2 out. The vascular bundles or veins in a leaf are part of the plant’s transportation
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