______ is thought to block the movement of water or gases through a pit-pair in conifer tracheids.
A) Resin
B) The pit membrane
C) The middle lamella
D) A torus
E) A resin duct
Correct Answer:
Verified
Q23: Biennials form roots, stems, leaves and flowers
Q24: How many rings of vascular cambium would
Q25: In wood having a high specific gravity,
Q26: Wood contains mostly:
A)primary phloem
B)secondary phloem.
C)primary xylem.
D)secondary xylem.
E)periderm.
Q27: Ring-porous woods are different from diffuse-porous woods
Q29: Conducting phloem:
A)is composed of primary tissue.
B)is part
Q30: After the first periderm is formed, additional
Q31: Which of the following is found in
Q32: Which of the following statements about resin
Q33: "Softwood" is the name given to wood:
A)found
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