About fifty years ago, plant physiologists set out to grow roots, by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require the energy of course. The process of respiration uses sugar to make the high-energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
The phrase 'got alone fine' in line 5 means -
After help, we can use object + infinitive (with or without to).
| Can you help me (to) find my ring? (NOT | |
| Thank you so much for helping us (to) repair the car. | |
| Our main task is to help the company (to) become profitable. |
Help can also be followed directly by an infinitive without an object.
| Would you like to help pack? |
If you say that you cannot/can’t help doing something (especially in British English), you mean that you can’t stop yourself, even if you don’t want to do it.
| She’s a selfish woman, but somehow you can’t help liking her. | |
| Excuse me – I couldn’t help overhearing what you said. | |
| Sorry I broke the cup – I couldn’t help it. |
Can’t help can be followed by but + infinitive (without to), with the same meaning as can’t help verb + ing. This is common in American English.
| I can’t help but wonder what I should do next. |
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