Newton’s first law or law of inertia:

An object at rest remains at rest, or if in motion, remains in
motion at a constant velocity unless acted on by a net external force. An external force is a force
originating from outside an object rather than a force internal to an object. For instance, the
force of gravity that Earth exerts on the moon is an external force on the moon . The property of
a body to remain at rest or to remain in motion with constant velocity is called inertia. Newton’s
first law is often called the law of inertia . The inertia of an object is measured by its mass.
Example-The motion of a ball falling down through the atmosphere,

Newton’s second law of motion

Newton’s second law of motion or law of acceleration is closely related to Newton’s first law of
motion. It mathematically states the cause and effect relationship between force and changes in
motion. Newton’s second law of motion is more quantitative and is used extensively to calculate
what happens in situations involving a force. Newton’s second law states that the acceleration of
an object is directly related to the net force and inversely related to its mass.
Acceleration is a vector quantity that is defined as the rate at which an object changes its
velocity. An object is accelerating if it is changing its velocity.
Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass.
Your leg muscles pushing pushing on the pedals of your bicycle is the force.

Newton’s third law of motion

Newton third law or The law of action-reaction
His third law states that for every action (force) in nature there is an equal and opposite reaction.
In other words, if object A exerts a force on object B, then object B also exerts an equal and
opposite force on object A.
example, when you jump, your legs apply a force to the ground, and the ground applies and
equal and opposite reaction force that propels you into the air. Engineers apply Newton’s third
law when designing rockets and other projectile devices.


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What would happen if photosynthesis stopped ?

  1. Most plants make their own food by photosynthesis. If they stopped, they would die! If most plants die, animals that rely on such plants for food will also die
  2. All organisms except for anaerobes would die out and food(energy) will run out.

What is aerobes and anaerobes

  1. Anaerobic grow in the Absence of oxygen
  2. Aerobic grow in the presence of oxygen

What is photosynthesis

  1. Photosynthesis is a process by which plants make their own food in the presence of sunlight, carbon-dioxide present in air, water, minerals and chlorophyll present in leaves is termed as photosynthesis
  2. The process by which plants make their own food in the presence of sunlight, carbon-dioxide present in air, water, minerals and chlorophyll present in leaves is termed as photosynthesis.
  3. Photosynthetic organisms are photoautotrophs, which means that they are able to synthesize food directly from carbon dioxide and water using energy from light.


  1. Photosynthesis is usually represented by the equation 6 CO2 + 6 H2O + light –> C6H12O6 + 6 O2. During this process, organisms such as plants go through the light-dependent and light-independent reactions to convert carbon dioxide and water into sugars and oxygen.


  1. Chlorophyll is vital for photosynthesis, which allows plants to absorb energy from light.  Chlorophyll molecules are arranged in and around photosystems that are embedded in the thylakoid membranes of chloroplasts.


There are four types of chlorophyll:

  1. chlorophyll a, found in all higher plants, algae and cyanobacteria;
  2. chlorophyll b, found in higher plants and green algae;
  3. chlorophyll c, found in diatoms, dinoflagellates and brown algae; and
  4. chlorophyll d, found only in red algae.

Chlorophyll absorbs green wavelengths from the sun, which makes plants look green. Both photosynthesis and cellular respiration yield molecules used for energy.

However, photosynthesis produces the sugar glucose, which is an energy storage molecule. Cellular respiration takes the sugar and turns it into a form both plants and animals can use.

Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth’s atmosphere, and supplies most of the energy necessary for life on Earth.

Approximately 176 billion tons of carbohydrate in the form of glucose is produced by photosynthesis every year.

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