I believed that the correct answer is B
b) One with spiny leaves and a thick stem.
Explanation:
- Plants growing in desert face scarcity of water and they need to check transpiration rate.
- To reduce the rate of transpiration the leaves of desert plands are reduced to spines, which resulted in a reduced surface area and negligible number of stomata.
- The Stems of Desert plants are modified to store water to prevent desiccation and hence they are thick and succulent.
There are three slopes in a survivorship curve, which indicates the average life expectancy of a population.
Type I<span> or convex curves in which few offsprings are produced, but they are cared well and get matured and survive.
</span>Type II or diagonal curves where al almost constant rate of birth or mortality is observed.
Type III or convex curves where high mortality is observed in early life, but the aged population has a high survival rate.