Answer: D) By decreasing the activation energy of a reaction
A catalyst is a substance that speed up the rate of chemical reaction without affecting the product of the reaction. They only affect the rate of reaction not the yield of reaction.
Catalyst provide an alternative reaction pathway that has lower activation energy than that of uncatalysed reaction. It increases the frequency of collision and because of these greater collision which lowers the activation energy of the reaction.
A catalyst works by decreasing the activation energy of a reaction, providing an alternative pathway for the reaction to occur with lower energy barriers. Therefore, the correct answer is option is d.
A catalyst works by D. by decreasing the activation energy of a reaction.
A catalyst is a substance that speeds up a chemical reaction without itself being consumed or permanently changed in the process. It achieves this by providing an alternative reaction pathway with a lower activation energy. The activation energy is the minimum amount of energy required for a reaction to occur.
Here's how it works:
In a chemical reaction, reactant molecules need to overcome an energy barrier, represented by the activation energy, to transform into products.
Catalysts provide an alternative route for the reaction that has a lower activation energy. This lower activation energy pathway is often referred to as the catalyzed pathway.
By reducing the activation energy, the catalyst allows more reactant molecules to possess the required energy to overcome the barrier and react, thus increasing the reaction rate.
Importantly, the catalyst itself remains unchanged at the end of the reaction and can be used repeatedly for other reactions.
In summary, a catalyst facilitates a chemical reaction by lowering the activation energy required for the reaction to proceed, making it easier for reactant molecules to convert into products and increasing the reaction rate.
Therefore, the correct answer is option is d.
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Answer:
Insulin is secreted by the pancreas which regulates the blood glucose level in the blood. Insulin generally reduces the blood glucose level by depositing the glucose in the liver and muscles as glycogen.
In diabetic people, enough insulin is not produced by the pancreas as a result glucose level increases in the blood which is called hyperglycemia. So in this condition, insulin injection is given from outside to increase the level of insulin in the blood.
Then this increased level of insulin helps in reducing the extra amount of insulin from the blood by accumulation it on the liver. Therefore insulin play a role in reducing the extra amount of free glucose from the blood.
2. location of earthquakes
3. rain forest depletion
4. the shape of the continents
Rain forest depletion is not evidence of plate tectonics.
• Plate tectonics is responsible for the distribution of fossils on distinct continents, for the continental and ocean floor features comprising volcanoes, mountains, trenches, and faults, for the occurrence of earthquakes, and the shape of the continents.
• On different continents, the fossils are identical to the fossils found on the continents, which were once connected.
• The majority of the oceanic and continental floor features are the outcome of the earthquake and geological activity along the plate boundaries.
• The depletion of rainforest is not a result of plate tectonics. The major reason for rainforest depletion are agriculture and fuelwood collection.
• Apart from this, some of the human activities like logging, mining, development of large dams and industry is also major cause of rainforest depletion.
Thus, rainforest depletion is not evidence of plate tectonics.
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Answer:
Display of different mating behavior and their reproductive isolation.
Explanation:
Display of different mating behavior and their reproductive isolation would suggest that the birds belong to different species rather than the same species. Individuals from same species can interbreed to produce fertile progeny. Display of different mating behavior and absence of any interbreeding among the birds of two population suggest that they belong to two different species.
function of endosperm include in dicots like peas and beans food is stored in cotyledons not in endosperm that is why it is absent in dicots
Endosperm developed from the triploid cell (3n) in the embryo sac where the second male gamete fuses with the diploid secondary nucleus to form primary endosperm nucleus (PEN) and a triploid cell which is called as triple fusion
Endospermic cells are mostly triploid but in some plants, they may be diploid (water lily) or polyploid (up to 15n)
In some of the dicots, mature seeds contain food stored in the endosperm, they are called endospermic or albuminous seeds, e.g. castor
In beans, peas, gram seeds, the endosperm is completely absorbed during development and food is stored in two cotyledons. They are called exalbuminous seeds
Endosperm mostly contains starch as a food reserve, but it may contain fats, e.g. castor, Endosperm provide nutrients to seeds during dormancy
Endosperm also contains certain hormones like cytokinins and helps in cell differentiation
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Answer:
the answer is C: the production of pesticide-resistant potatoes.
Explanation:
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