The activity of already differentiated effector and memory T cells is maintained by a receptor which are generally expressed on the memory and effector T cells. 

#Question id: 24642

#Unit 10. Ecological Principles

 Which of the following is not the component of Soil?

#Question id: 23178

#Unit 13. Methods in Biology

#Question id: 8689

#Unit 9. Diversity of Life Forms

Which of the following statements best describes the rationale for applying the principle of maximum parsimony in constructing phylogenetic trees?

#Question id: 12050

#Unit 7. System Physiology – Animal

#Question id: 11049

#Unit 6. System Physiology – Plant

Match the CORRECT combination of the phloem elements with its function.

            PHLOEM ELEMENTS                                                  FUNCTIONS

P) sieve tube elements                                    i) for protection and strengthening of the tissue

Q) sieve cells                                                  ii) store and release food molecules

R) companion cells                                        iii) food translocation in angiosperm

S) Phloem parenchyma cells                          iv) latex containing cells

T) Phloem fibers and sclereids                       v) help in flow of solute and show high, metabolic activity

U) laticifers                                                     vi) food translocation on gymnosperm