22 points and !

why do plants excrete more carbon dioxide at night than during the day?

a. cellular respiration occurs only at night and not during the day.

b. cellular respiration occurs at a faster rate at night than during the day.

c. photosynthesis uses some of the carbon dioxide released during the day.

d. the light-independent reaction of photosynthesis that releases carbon dioxide occurs at night.

which statement about the difference between autotrophs and heterotrophs is true?

a. autotrophs transform radiant energy into chemical energy, but heterotrophs can’t.

b. autotrophs take in only oxygen, but heterotrophs take in both oxygen and carbon dioxide.

c. autotrophs have two different electron transport systems, but heterotrophs have none.

d. autotrophs don’t have a calvin cycle, but heterotrophs do.

1 -

During the day, the plant concentrates in the process of photosynthesis, because it can only occur with sunlight. Therefore, during the night, the plant concentrates on cellular respiration since it cannot do photosynthesis.

Be careful when answering this one, because cellular respiration does occur during the day, but predominantly during the night since there barely is no photosynthesis occuring.

B.

2 -

Autotrophs use radiant energy to feed themselves, but not in the form of radiant energy. Instead, they convert it to chemical energy, which is something heterotrophs don't do, since they have other sources of chemical energy.

A.

Image 1 -

Stomata, are little mouth-like structures that can open and close. We could say, that they're gas-exchange hotpoints, since when they're open, they exchange gases with the environment, helping significantly duing the process of photosyntehsis.

D.

Image 2 -

Just with the salmon fillet, he has already eaten enough vitamin B12, more than 100% of the recommended daily allowance. The amount of vitamin E of the salmon fillet was low, and the amount of vitamin C was null.

The boiled green beans gave him quite a lot of the vitamin C he needs, but not enough. The vitamin E that the boiled green beens provided was also not enough. The amount of vitamin B12 was null.

The sliced strawberries where enough to back up the lack of vitamin C of the boiled green beans, but not enough to back up the lack of vitamin E. The amount of vitamin B12 was null.

Math:

If we do the math needed, we see that Robert only had enough vitamin B12 and C, and that he needed way more vitamin E.

B. -

I've answered this already in another question of yours. Please check you profile. - link

Hope it helped,

BioTeacher101

the endomembrane system i think