what is activation energy

For a reaction to occur, reactant molecules must collide with each other. Only those collisions result in product formation which have energy equal or more than a certain minimum energy. This energy is called the threshold energy. This implies that ther..

For a reaction to occur, reactant molecules must collide with each other. Only those collisions result in product formation which have energy equal or more than a certain minimum energy. This energy is called the threshold energy. This implies that there is a..

Movement of ions from the outer space of the cell to the inner space is generally against the concentration gradient and hence requires energy. This energy is obtained through metabolism either directly or indirectly. Various evidences indicate the active uptake of ion..

The transport of materials across the cell membranes with the help of energy is called active transport. Both diffusion and osmosis are passive transport mechanisms, not requiring energy. Active transport helps in the transport of ions across the membranes o..

Water is absorbed due to activities going on in roots. Absorption of water occurs with the help of energy in the form of ATP, which is released due to metabolic activities of root cells such as respiration. Absorption takes place against concentration gradient - even w..

It is a process by which certain substances like glucose molecules are transported against the concentration gradient. The carrier proteins in the cell membrane carry out the process. The substance present in the medium binds with the active site on the carrier protein forming a comp..

Energy Transfer and Energy Transformation - Energy is the capacity to do work. All living organisms require energy for carrying on their vital metabolic activities. The primary source of energy for living system is solar radiation. The rad..

Draw a scalene triangle, an acute angled triangle, an obtuse angled triangle, an equilateral triangle and a right angled triangle. Measure the angles in all the figure. Enter the measure in the table given. What do you observe? What do you conclude with respect to the sum of th..

Take a thin layer of tissue from the lower surface of the leaf. Mount it on a slide in water and examine under a microscope. You will find tiny pores or stomata along with the epidermal cells. The stomata are bound by a pair of guard cells whose concave sides face each other. It is through the stom..