Answer:
All energy in the system are either potential or kinetic.
Option A to D are true
Explanation:
Kinetic Energy is the energy in a body when the body is not at rest (i.e. when it is in motion)
Whole
The potential energy of an object is energy of the body in a stored form. This means that when the body is at rest (not moving but waiting to do work). This is seen in Option A where the ball is held motionless above the floor.
The potential energy of a body decreases when the body moves downward and the kinetic energy increases. This is seen in Option B and C.
The last option D is supported by the first law of thermodynamics, also known as Law of Conservation of Energy, which states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. The potential e ergy of the body when held motionless above the floor is equal to the kinetic energy of the body when it hits the floor.
Answer:
Catalyst is a substance that influences the rate of reaction without being consumed in the reaction.
- They increase the rate of reaction by decreasing the activation energy of the reaction.
- As they are not used up in the reaction they are required in a small quantity.
- In biological system, enzymes are referred to as biological catalyst or biocatalyst. They are generally protein in nature and are very specific for their substrate. They also increases the rate of biological reaction by forming enzyme-substrate complex.
- Few examples of catalyst are: potassium permagnet, platinum, enzyme (like hexokinase, hydrolase etc) etc.
Answer:
14. heterotrophs include both omnivores and carnivores
15. a food chain follows one path of energy and materials between species. A food web is a complex of food chains. a food web is where organisms are placed into different trophic levels.
16. decomposers are heterotrophic, and carnivores are also heterotrophic
17. autotrophs and heterotrophs are both in the food chain.
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