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Silviculture is the art and science of controlling the establishment, growth, composition, health, and quality of forests to meet diverse needs and values of the many landowners, societies and cultures over the parts the globe that are covered by dry land. It can also be said to be the science and practice of controlling the establishment, composition, and growth of the vegetation of forest stands.
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Yogita Ingle 5 years, 8 months ago
Capillaries are a bunch of thin blood vessels surrounds organs in our body. They are meant to be thin walled because they have to perform gaseous exchange between cells by taking up carbon dioxide from blood and give oxygen to the cells.
Their thin- walled structure helps them in gaseous exchange throughout the body.
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Meghna Thapar 5 years, 5 months ago
o demonstrate that chlorophyll is essential for photosynthesis.
Requirements : A potted plant with variegated leaves - for example, Croton or money plant (variegated leaves are partly green and partly white), rice paper, pencil, white paper sheath, beaker, test tube, 70% alcohol, KL solution, water bath.
Method : Keep the potted plant with variegated leaves in dark for three days so that the leaves become free from starch. Then place the plant in bright sun light for about 6 hours. Take a variegated leaf of the potted plant kept in bright sunlight. Trace the outline of leaves and its variegated parts on the tracing paper (the variegated leaves show pale yellow spots in green leaves. These areas indicate the absence of chlorophyll). Dip the leaf in boiling water for a few minute. Now boil the leaf in 70% alcohol till it decolorizes. Now dip the leaf in boiled water to make the leaf soft. Take out the leaf and stain with iodine (KL) solution. Observe the change in colour.
Observation : The blue colour appears only in those parts of leaf which were green in colour. The blue colour will not appear in variegated parts. This shows that starch formation takes place only in green (chlorophyll containing) parts of the leaf. Thus, the chlorophyll is essential for photosynthesis.
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Posted by Amrit Sharma 5 years, 8 months ago
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A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.
Consider the following redox reaction.
- Burning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.
|
C6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l) |
Amrit Sharma 5 years, 8 months ago
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The mode of nutrition in Amoeba is holozoic and various steps involved in the process of nutrition are:
- Ingestion: Amoeba ingests food with the help of its finger-like extensions, called pseudopodia, when a food particle approaches Amoeba it forms pseudopodia around it and forms a food vacuole inside the Amoeba
- Digestion: Various enzymes from the cytoplasm enter into the food vacuole and break them down into simple soluble molecules
- Absorption: The simple soluble food is absorbed by cytoplasm of Amoeba from food vacuoles through the process of diffusion
- Assimilation: Amoeba cell obtains energy from the absorbed food through respiration and this energy is utilized by Amoeba for its growth and repair of the body
- Egestion: When a considerable amount of undigested food gets collected inside Amoeba, its cell membrane ruptures and throws out the undigested food
Posted by Aaryan Kumar 5 years, 8 months ago
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The purpose of using desiccators is to absorb moisture. Anhydrous Calcium chloride (CaCl2) has a capacity of absorbing moisture as it is hygroscopic in nature, so it is used as a desiccators.
Posted by Yangkela Sherpa 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Life processes are the vital processes carried out by living organisms in order to maintain and sustain life. Molecular movements are essential to carry out the various life processes. Thus the processes which together perform the maintenance job are called life processes. Energy required to carry out the different life processes, is obtained through the process of nutrition. A series of chemical reactions in the body are necessary to obtain energy. Oxidising-reducing reactions are some of the most common chemical means to break-down molecules. The process of acquiring oxygen from outside the body, and to use it in the process of break-down of food sources for cellular needs, is called respiration. In the case of a single-celled organism, no specific organs for taking in food, exchange of gases or removal of wastes may be needed because the entire surface of the organism is in contact with the environment. In multi-cellular organisms, various body parts have specialised in the functions they perform.
The basic functions performed by living organisms to maintain their life on this earth are called life processes. The basic life processes common to all living organisms are – Nutrition and Respiration; Transport and Excretion; Control and Coordination; Growth; Movement and Reproduction.
Posted by Manik Chadda 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Breaking down of glucose involves two processes. In the first step, it is broken into three carbon molecules called pyruvate. The pyruvate is further broken down into energy in following different ways in various organisms.
1) Aerobic respiration : In this case pyruvate is broken down into water and carbon dioxide along with release of energy. It commonly occurs in mitochondria of cells.
2) Anaerobic respiration in yeast : In yeast cells during fermentation pyruvate is converted into ethanol and C02 in the absence of 02.
3) Anaeorbic respiration in muscles: Due to lack of oxygen, eg. during vigorous running or exercise, in human muscles, pyruvate is converted to lactic acid.
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In the leaves of both the rnonocot and dicot plants, very small or miniature openings called stomata were present surrounded by guard cells on the either sides of it. The stomata are equally present on both the epidermal surfaces, i.e. upper and lower surfaces in leaf.
Posted by Sumit Kumar 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Parathyroid hormone (PTH), also called parathormone or parathyrin, is a hormone secreted by the parathyroid glands that regulates the serum calcium through its effects on bone, kidney, and intestine.The hormones produced in the hypothalamus are corticotrophin-releasing hormone, dopamine, growth hormone-releasing hormone, somatostatin, gonadotrophin-releasing hormone and thyrotrophin-releasing hormone.
Posted by Sumit Kumar 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Parathyroid hormone is secreted by the four parathyroid glands. They are the tiny glands, about the size of rice granules which are located in the neck of the thyroid gland. Parathyroid hormone controls and regulates the calcium levels in the blood and raise their levels when they are too low. This gland performs its function through its actions on the bones, intestine, and the kidneys.
There are two main types of Parathyroid hormone :
- Parathormone.
- Calcitonin.
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Meghna Thapar 5 years, 5 months ago
Natural resources can be defined as the resources that exist (on the planet) independent of human actions. ... Common examples of natural resources include air, sunlight, water, soil, stone, plants, animals, and fossil fuels. Any natural substance that humans use can be considered a natural resource. Oil, coal, natural gas, metals, stone and sand are natural resources. Other natural resources are air, sunlight, soil and water. Animals, birds, fish and plants are natural resources as well.
A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.
Food web is an important conceptual tool for illustrating the feeding relationships among species within a community, revealing species interactions and community structure, and understanding the dynamics of energy transfer in an ecosystem.
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