Which of the following is an example of secondary growth?
increase in length
increase in thickness or girth
increase in root hairs
increase in leaf number

The correct answer is B. Increase in thickness or girth

Explanation:

In plants, there are mainly two types of growth that can take place, these are primary and secondary growth. Primary growth mainly takes place in the stems and roots especially in the tips of these and because of this, this type of growth is the one that occurs when a plant increase in length or there is an increase in its roots. On the other hand, secondary growth occurs in the stem mainly as this increases in thickness. Considering this, the one that is an example of secondary growth is the increase in thickness or girth (circumference).

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.