15. Deficiency symptoms of nitrogen appear first in older leaves because nitrogen is: (A) Required only in young tissues (B) Immobile in the phloem (C) Mobile and reallocated to young tis:issues (D) Stored permanently in vacuoles

9. Which feature best distinguishes bryophytes from vascular plants with respect to life-cycle dominance? (A) Bryophytes possess a dominant sporophyte with vascular tissues (B) Bryophytes rely onon seeds for embryo nourishment (C) Bryophytes have a dominant gametophyte generation that supports a dependent sporophyte (D) Bryophytes exhibit equal dominance of both generations

15. Deficiency symptoms of nitrogen appear first in older leaves because nitrogen is:
(A) Required only in young tissues
(B) Immobile in the phloem
(C) Mobile and reallocated to young tis:issues
(D) Stored permanently in vacuoles

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