National 5 Biology- Photosynthesis

I'm doing higher this year and they haven't said anything about photolysis being enzyme controlled :/
I know that the kalvin cycle (stage 2) is, I would have thought we would have been told if photolysis was aswell. There't not much happening that enzymes would control, only the splitting of water and that is done by the light energy that is converted to chemical energy. The generation of ATP is by energy released from the splitting water bond.

Experiment constants..

Volumes
Concentrations
Tissue samples should be taken from the same plant/source
Temperature (in some circumstances)
Time

are the most common ones

x

So the 90% is lost as the organism is living, as it gives off heat and poos stuff out. However, when it gets eaten by the next level, there is still energy in the plant - 10% - and the animal that has eaten it makes use of this energy to grow. That's where the new biomass come from.

Ah okay Thank you so much for your help!

That's absolutely fine, I'm happy to help! If there's anything else you're stuck on just ask

Okay say an organism had 100kJ of energy. When it gets eaten by the next organism on the food chain, that organism receives 10 of those 100kJ. The other 90kJ are lost. The organism then uses all of that 10kJ to carry out cellular processes and growth and stuff. It just adds on to whatever energy they had already in them.

So it uses all 10kJ just for building new biomass... or 10% of 10kJ?

10kJ, because the first animal had 100kJ. 10% is passed on and 10% of 100kJ = 10kJ

It seems everyone else was taught it's called photolysis but I was doing model papers and they call it the ''light dependent stage'' in the answers. Does anyone why this is and will you get marks off for saying photolysis?

But isn't some of that 10kJ used for movement etc? Sorry about this

Yeah I think so. But we don't do this in higher, so i haven't don't all that for a year you may want to check with your biology teacher before your exam tomorrow if that's possible.
Although if they ask you a question about it its likely to be something like they give you the energy of an organism and ask you how much will be passed on to the next level.
There could also be a question saying "what happens to the 90% of energy that is lost?" or something along those lines…as far as i can remember anyway

N5 biology exam is tomorrow :/

Does anyone know whether or not the first stage of photosynthesis (aka photolysis- when water is broken down to oxygen and water) is enzyme-controlled?
I've looked it up but some websites say yes and some say no. :/
Thanks )

It seems everyone else was taught it's called photolysis but I was doing model papers and they call it the ''light dependent stage'' in the answers. Does anyone why this is and will you get marks off for saying photolysis?