Identify the importance of water. check all that apply.

1. it ensures life on earth can exist.

2. it is a part of all organic compounds.

3.it is used by plants for photosynthesis.

4. it is the main component of many biological components, including blood.

Option 1, 3 and 4

Explanation:

Most of the natural processes on earth involves the usage of water such as hydro-logical cycle, nutrient cycle, climate cycle etc. All these processes are very essential for the survival of life on earth and thus,  option A is correct

In phosysthesis , H+ ion and oxygen comes from the dissociation of H2O. while oxygen is released into the atmosphere, H+ get associated to form energy molecule like NADH etc. Thus,  option 3 is also correct

Blood contains 92% of water and thus it forms the main component of biological components. Thus,  option 4 is also correct

But as given in option 2 , all organic compounds have water only in there aqueous phase (solution). Therefore , option 2 is in correct

energy per photon is e = h*c / λ  

e = 6.63*10^-34 * 3*10^8 / 6*10^-7 j = 3.315*10^-19 j  

nr. of photons = 10j / 3.315*10 = ^-19 j per photon = 3.02*10^19 photons