Answer:
The correct answer will be- all options are correct.
Explanation:
Azotobacter is a genus or a group of bacteria which are involved in the process of nitrogen fixation.
The bacteria can be easily identified by their rod-shaped form and gram staining. Gram staining results show that they are gram-negative bacteria as they stain pink in color due to the thin peptidoglycan layer.
They require oxygen to perform cellular respiration so are called obligate aerobes. Also, they can fix the atmospheric nitrogen by converting it into ammonia.
Thus, all the options are correct.
Answer:
Density, dispersion, growth
Explanation
Population refers to the total number of all members of a species occupying a particular area or habitat at a given time. Populations are not static but change in size, structure and organization. Some of the characteristics of population are:
- Density which refers to the number of members of a species per unit area or volume.
- Dispersion refers to the spread and distribution of individuals of a species within a habitat.
- Growth is the rate of increase or decrease in the number of individuals in a population which is balanced by birth rate and death rate.
The issues that affect population include competition, predation, emigration, diseases and parasites.
True, because topsoil is developed over time
A mitochondrion is an organelle that produces energy
A carrier of a trait has both a dominant and recessive allele, but only the dominant allele is shown.