The most abundant element amongst the following as found in plants is
A: Carbon
B: Nitrogen
C: Iron
D: Manganese
A: Carbon
B: Nitrogen
C: Iron
D: Manganese
A
举一反三
- （ ）is the most abundant chemical element in plants and animals. A: Oxygen B: Carbon C: Hydrogen D: Nitrogen
- Which is the most abundant atom (% body weight) in the human body? ( ) A: Hydrogen B: Oxygen C: Carbon D: Nitrogen
- Which of the following is the most abundant solid mineral in the seabed?( ) A: Manganese nodule B: Nickel ore C: Copper mine D: Cobalt ore
- ( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- All organic compounds contain the element A: Phosphorus B: Nitrogen C: Sulfur D: Carbon E: Oxgen
内容
- 0
In addition to iron and carbon, list the other elements that may be found in a grey cast iron and describe their effect on the properties of a grey cast iron.
- 1
Which element is the most abundant in the Earth (by weigh)? A: Si B: O C: Al D: Fe
- 2
Which of the following is not an application of genetic engineering in plants? ( ) A: nitrogen fixation B: DNA vaccines C: resistance to glyphosate D: production of insecticidal proteins in plants
- 3
The most abundant greenhouse gas in the atmosphere is . A: nitrous oxide B: methane C: chlorofluorocarbons D: carbon dioxide
- 4
Which element is the most abundant one in the crust (by weigh)? A: Si B: O C: Al D: Fe