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DOI: 10.21276/ijlssr.2016.2.3.8 ABSTRACT- Haustoria, the organ of absorption of nutrients found in semi parasite Helicanthes elastica growing on six different host plants were examined for the growth pattern of epicortical roots over the host stem. Anatomical sections of haustoria entry portions were taken to study the establishment of haustoria inside the hosts. Surface characterstics and nature of the conducting tissues of the host decides the growth pattern of epicortical roots over the host, entry of haustoria in to the host and its successive establishment. The nature of bark is of prime importance in the penetration. Branches of haustoria are chiefly found in secondary xylem and also in some portions of the secondary phloem. Presence of parasitic hypahe for the absorption has been found in some of the selected hosts. Key-words- Epicortical roots, Haustoria, Secondary xylem, Parasitic hyphae, Helicanthes elastic
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www.seribangash.com The Mariana Trench is one of the most remarkable geological features on Earth. Here are some details about it: Location: The Mariana Trench is located in the western Pacific Ocean, east of the Mariana Islands. It stretches for about 2,550 kilometers (1,580 miles) and is known as the deepest part of the world's oceans. Depth: The trench reaches incredible depths, with its deepest point known as the Challenger Deep, which plunges down to approximately 10,984 meters (36,037 feet) below sea level. To put this into perspective, if Mount Everest, the tallest mountain on Earth, were placed at the bottom of the Challenger Deep, its peak would still be over 2 kilometers (1.25 miles) underwater. Formation: The Mariana Trench was formed by the subduction of the Pacific Plate beneath the Mariana Plate. This process creates a deep trench as the heavier Pacific Plate is forced beneath the lighter Mariana Plate. Geological Features: The trench is characterized by steep, V-shaped valleys, and its walls are composed of highly compressed sedimentary rock. At the bottom of the trench, there are also large amounts of marine sediment. Pressure: The pressure at the bottom of the Mariana Trench is immense, reaching over 1,000 times the pressure at the surface. This extreme pressure creates a challenging environment for exploration and makes it difficult for organisms to survive. Exploration: Despite its extreme conditions, the Mariana Trench has been the subject of numerous scientific expeditions and explorations. One of the most famous explorations was the dive to the Challenger Deep by Swiss scientist Jacques Piccard and U.S. Navy Lieutenant Don Walsh in 1960. More recently, in 2012, filmmaker James Cameron made a solo dive to the bottom of the Challenger Deep in the Deepsea Challenger submersible. Biological Discoveries: Despite the harsh conditions, the Mariana Trench is home to a surprising variety of life forms, including unique species of deep-sea fish, crustaceans, and microbial life. Some organisms have adapted to survive in the extreme pressure and darkness of the trench. Environmental Importance: Studying the Mariana Trench provides valuable insights into the geology, biology, and oceanography of the deep sea. It also helps scientists better understand the processes that shape the Earth's crust and the distribution of life in the oceans. Conservation: Due to its remote location and extreme depths, the Mariana Trench has remained relatively untouched by human activity. However, there is growing concern about the potential impacts of deep-sea mining and pollution on this fragile ecosystem, highlighting the need for conservation efforts to protect this unique environment. https://seribangash.com/barber-shop-business-complete-guide-for-beginners/ https://seribangash.com/legend-virat-kohli-in-cricket-history/
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Root and its types
1.
SUBJECT: Morphology of
vascular Plants Semester: II, BS Botany Teacher Name: Dr. Khalid Rasheed Khan Department of Botany Government College Mansehra
2.
Topic:-Root: introduction, various types
of roots
3.
ROOT:--- The cylindrical plant
organ without chlorophyll growing towards the gravity is called root. Types:- 1.Tape root 2.Adventitious root
4.
Tape Root Fibrous tape
root Tuberous tap root 1.Conical e.g radish 2.Fusiform e.g English carrot 3.Napiform e.g turnip
5.
6.
Adventitious roots Underground /subterranean
Tuberous adv roots Aerial roots Parasitic roots aquatic rots e.g Hedera e.g Hydrilla 1.Fibrous adve roots 1.Stilt roots 1.climbing roots e.g pepper e.g grasses e.g maize 2.absorbing roots e. g epiphytic 2.Tuberous adve roots 2.prop roots e.g sweet potato e.g rubber tree 3.Aerating roots e.g Mangrooves
7.
8.
FUNCTIONS 1.Anchorage 2.Absorbtion of water
and minerals 3.Sotre reserve food 4.Vegetative growth 5.Fixation of Atmospheric Nitrogen
9.
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