Class 7 science -Chapter 4 – Heat – Definition and Explanation of Important Keywords

Class 7 Science – Chapter 4 Heat: Definition and Explanation of Important Keywords”
In this chapter, we explore crucial heat-related terms like “Celsius scale,” which measures temperature, and “conduction,” the process of heat transfer in solids. “Convection” explains heat flow in fluids, while “radiation” details heat transfer without a medium. Understanding these terms is essential for grasping the science of heat.

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Photorespiration occurs in

Photorespiration occurs in C3 plants and involves several organelles. In chloroplasts, RuBP oxygenase reacts with RuBP, leading to the formation of PGA and PGly. Glycolic acid is produced in chloroplasts and then undergoes oxidation in peroxisomes, forming glyoxylic acid. Within mitochondria, glycine combines with CO2 and NH3, releasing CO2 and forming serine.

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Chapter 13 - Photosynthesis in Higher Plants

Photorespiration is a Wasteful process Justify

Photorespiration is a wasteful process that inhibits photosynthesis by diverting RuBisCO activity from carbon fixation. It reduces the production of glucose and oxygen, important products of photosynthesis. In addition, photorespiration consumes ATP instead of producing it, resulting in a loss of energy for the plant. It also leads to a loss of fixed carbon through the release of carbon dioxide, which further reduces carbon gain.

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Crassulacean Acid Metabolism (CAM) -Pathway, Significance, Examples

Crassulacean Acid Metabolism (CAM) is a specialised form of photosynthesis in xerophytic succulents. CAM Plants absorb CO2 at night, store it as malic acid and release it during the day for carbohydrate production. They conserve water by closing the stomata during the day. Examples are orchids, cacti, aloe and pineapple. CAM enables efficient CO2 use, water conservation and reduced photorespiration in arid environments.

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mitochondria short note

Short Note on Mitochondria

Mitochondria, the ‘Powerhouse of the cell’, are double-membrane organelles found in eukaryotic organisms. They function as the cell’s digestive system and play an important role in energy production through oxidative phosphorylation. With their unique structure and multiple functions, mitochondria regulate metabolism, promote cell growth, detoxify ammonia, induce apoptosis and maintain calcium ion balance, making them essential for cellular activities.

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blood coagulation - blood clotting

Blood Coagulation (Blood Clotting)

Blood coagulation or blood clotting is a complex process that prevents excessive bleeding after an injury. It involves platelets, clotting factors, fibrin, and endothelial cells and occurs in a series of steps including vasoconstriction, platelet activation, the coagulation cascade, clot retraction and fibrinolysis. There are many clotting factors involved in coagulation. Disruptions to any of them can lead to bleeding disorders or unwanted blood clots.

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Phloem – Definition, Structure, Function, Types and How does Phloem tissue work

Phloem tissue is a type of vascular tissue in plants that transports sugars, amino acids, hormones and other organic compounds from the leaves to the rest of the plant. The tissue is made up of several different types of cells like sieve tube elements, companion cells, phloem parenchyma and phloem fibers. Phloem tissue plays a critical role in plant growth and development by facilitating the transport of hormones, defending against pathogens, transmitting signals and storing nutrients. There are two types of phloem tissue- primary phloem and secondary phloem.

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Phloem Diagram – Longitudinal and Transverse Section Diagram of Phloem Tissue

The Phloem is a plant tissue responsible for translocating organic nutrients and other substances from leaves to other parts of the plant. Longitudinal and Transverse Phloem Diagrams show the internal structure of the tissue, including Sieve tubes, Companion Cells, Phloem Fibers and Phloem Parenchyma cells.Netaly labelled easy to draw Phloem Diagram – Longitudinal and Transverse Section Diagram of Phloem Tissue explained with description of Labels

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Xylem - Definition , Structure, Components (Types), Functions And Importance

Xylem – Definition , Structure, Components (Types), Functions And Importance

Xylem is a specialized tissue in vascular plants that transports water and minerals from roots to the rest of the plant. It is composed of tracheids, vessel elements, xylem parenchyma, xylem fibers and xylem rays. Water transport is driven by root pressure and transpiration pull. Xylem provides structural support, stores nutrients and transports signaling molecules. Its transport mechanism is a combination of physical and biological factors.

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Systolic and Diastolic Blood Pressure

What’s Systolic and Diastolic Blood Pressure?

Blood pressure is a vital sign that reflects the pressure of blood against the walls of arteries. Systolic blood pressure is the pressure in the arteries when the heart contracts and pumps blood out into the body, while diastolic blood pressure is the pressure in the arteries when the heart is at rest between beats. This article will provide an in-depth look at the differences between systolic and diastolic blood pressure, and why they are important .

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