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 -
Phrase
দুই বা ততোধিক শব্দ মিলে যদি একটি Parts of Speech-এর মতো কাজ করে তবে তাকে Phrase বা শব্দগুচ্ছ বলে। Phrase-এ সাধারণত কোনো Finite verb থাকে না ।
Kinds of Phrases : অর্থ, কাজ ও অবস্থানভেদে Phrase কয়েক প্রকারের হয়ে থাকে ।
1) Noun Phrase
2) Adjective Phrase
3) Adverbial Phrase
4) Prepositional Phrase
5) Conjunctional Phrase
6) Interjectional Phrase
7) Participle Phrase
8) Infinitive Phrase
9) Verbal Phrase
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