A leaf is tested for the present of starch..When is most strach likley to be present 1) after rain in morning 2)after serveral hours of darkness 3)first thing 4)after a long sunny day

4)after a long sunny day.

Explanation:

Sunlight is needed by plants to undergo photosynthesis so the answer is 4)after a long sunny day.

Hope it helps.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.