Quick help plz The presence of starch in leaf is tested using

Hey!

Your answer is The presence of starch in leaves is testing with the Iodine test!

Explanation:

The presence of starch in the leaf would be represented by the blue / black tint of the Iodine when put on the sample...

Iodine solution is used to test leaves for the presence of starch...heat a plant leaf in boiling water for 30 seconds...

Check that it is soft before removing it out of the beaker...

Spread on a WHITE tile...

And now place a few drops of Iodine onto the leaf...

*if it turns dark (blue/black), STARCH IS PRESENT*

*no real change in colour means there is not starch present!*

HOPE THIS HELPS!!

XD

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!