Refer to the given figure and select the correct option regarding P, Q, R and S.
AP is the plant part that later produces seeds and in some plants like cabbage and broccoli it gets modified to store food.
BQ transports water and minerals from soil to other plant parts and in some plants like turnip and carrot it gets modified to store food.
CLettuce and spinach have edible R and in some plants like pea and grapevine it gets modified into thread like structures that help in climbing up.
DS is the plant part that helps to keep the plant upright and is modified into thorns in some plants for protection.