Question

In the given flow chart, the flow of water is shown from soil to xylem of the root. Identify the tissues involved in steps A and B.
Root hair – cortex – A – pericycle- B – metaxylem
(A) A-Hypodermis: B-Protoxylem
(B) A-Medullary rays: B-Phloem
(C) A-Endodermis: B-Phloem
(D) A-Endodermis: B-Protoxylem

Answer 1

Water is very vital for the boom of vegetation and different metabolic activities. The water present in the soil is absorbed by way of the plant both actively or passively. Root hairs soak up water and then it is transported to the xylem.

Complete answer:
The absorption of water and minerals is the function of root hairs that are existing in thousands and thousands at the suggestions of the roots. These are extensions of root epidermal cells that greatly extend the floor vicinity for absorption. Water is absorbed by the root hairs in simple terms by using diffusion. After absorption of water thru root hair, it enters the cortex. From the cortex, the water enters the endodermis. The endodermis has Casparian strips.

The water molecules are unable to penetrate into this layer so they are directed to wall regions. The water now enters the pericycle. From the pericycle, the water enters into the protoxylem and then in the end into the metaxylem.
Phloem- It is the vascular tissue in plants responsible for the transport of prepared food.
Hypodermis and protoxylem- Hypodermis is the outermost layer in the plant cortex. It is associated with storage. Protoxylem is the first xylem to evolve from meristem.
Medullary ray- It is parenchyma cells present in between xylem and phloem.

Hence the correct answer is option ‘D’.

Note: The transpiration generates the driving force for the movement of water from the root to the leaves. The water from the pericycle always flows from protoxylem to metaxylem. It by no means flows from metaxylem to protoxylem. This water is required for photosynthesis in the leaves.