Explain why xylem transport is unidirect | Class 11 Biology Chapter Transport in Plants, Transport in Plants NCERT Solutions

In a plant, tranalocation in xylem is unidirectional while in phloem it is bidirectional. Explain.
 

How does water moves within the root?
 

Differentiate between Apoplast and Symplast pathways of water movement. Which of these would need active transport?
 

Explain the mass flow hypothesis of transport in phloem.

The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement
of the labelled carbon dioxide.

Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?

Define a taxon. Give some examples of taxa at different hierarchical levels.

What are the steps involved in formation of a root nodule?

Name the pathological condition when uncontrolled cell division occurs.
 

Aquatic animals generally are ammonotelic in nature where as terrestual forms are not. Comment.
 

Name the cells/tissues in human body which
a. exhibit ameboid movement
b. exhibit ciliary movement

How do you distinguish between a skeletal muscle and a cardiac muscle?

Why earthworm is called the friend of farmer?
 

Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities
occur during mitosis?
a. Nuclear membrane fails to disintegrate
b. Duplication of DNA does not occur
c. Centromeres do not divide
d. Cytokinesis does not occur.