CBSE Science Class 6, 7, 8, 9, 10th - Solved Exercises
Introduction to mathematics education. Methods and Techniques of Teaching Accounting. Taxonomy Detailed information and examples and links to database searches are found on our Microscopy Page Paragraph 3. See our separate Microphotos page. Evolution in the above links is based on current scientific evidence. Shortly before her death, the woman reported that she had been raped and assaulted by male inmates who were housed in the same cell block.
ICSE Grade 7
Answer Unlike the unicellular organisms, the multi-cellular organisms have complex body structures with specialized cells and tissues to perform various necessary functions of the body. Since these cells are not in direct contact with surrounding environment so, simple diffusion cannot meet the oxygen requirement of all these cells.
What criteria do we use to decide whether something is alive? Answer Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not. What are outside raw materials used for by an organism? Answer Various outside raw materials used by an organism are as follows: The raw materials required by an organism will vary depending on the complexity of the organism and its environment.
What processes would you consider essential for maintaining life? Answer Life processes such as nutrition, respiration, transportation, excretion, etc. What are the differences between autotrophic nutrition and heterotrophic nutrition? Food is obtained directly or indirectly from autotrophs. This food is broken down with the help of enzymes. Chlorophyll is not required. Food is generally prepared during day time. Food can be obtained at all time.
All green plants and some bacteria have this type of nutrition. All animals and fungi have this type of nutrition. Where do plants get each of the raw materials required for photosynthesis? Answer The following raw materials are required for photosynthesis: Plants absorb water from soil through roots and transport to leaves.
Sunlight, which is absorbed by the chlorophyll and other green parts of the plant. What is the role of the acid in our stomach? Answer Following are the roles of acid in our stomach: In this acidic medium, enzyme pepsinogen is converted to pepsin, which is a protein-digesting enzyme. What is the function of digestive enzymes? Answer Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc.
These simple particles can be easily absorbed by the blood and thus transported to all the cells of the body. How is the small intestine designed to absorb digested food? Answer The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food absorption. Within these villi, many blood vessels are present that absorb the digested food and carry it to the bloodstream.
From the bloodstream, the absorbed food is delivered to each and every cell of the body. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Answer Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O 2 as compared to water. Since the content of O 2 in air is high, the terrestrial animals do not have to breathe faster to get more oxygen. Therefore, unlike aquatic animals, terrestrial animals do not need adaptations for gaseous exchange. What are the different ways in which glucose is oxidized to provide energy in various organisms?
Answer At first glucose 6 carbon molecules is broken in the cytoplasm of cells of all organisms. This process yields a 3 carbon molecule compound called pyruvate. Further break down of pyruvate takes place in different manners in different organisms. This process takes place in absence of oxygen, e. In this case, pyruvate is converted into ethanol and carbon dioxide. In aerobic respiration, the breakdown of pyruvate takes place in presence of oxygen to give rise to 3 molecules of carbon dioxide and water.
The release of energy in aerobic respiration is much more than anaerobic respiration. Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid 3 carbon molecule compounds. Formation of lactic acid in muscles causes cramp. How is oxygen and carbon dioxide transported in human beings? The respiratory pigments haemoglobin present in red blood cells takes up the oxygen from the air to the lungs. They carry the oxygen to tissues which are deficient in oxygen.
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