Which of the following is not a component of the disease tetrahedron?
A. Host
B. Pathogen
C. Time
D. Control agent
Answer: Option D
Solution(By Examveda Team)
Control agent is not a component of the disease tetrahedron.A disease pyramid or tetrahedron, allows for the addition of a fourth causal factor of disease. Humans factor into the disease triangle because the influence of human activity on disease is pervasive in agriculture.
The concept of a disease pyramid or tetrahedron is composed of four main components that are environment, pathogen, host and host microbiome. The control agent is not a component of this tetrahedron.
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Which photosynthetic bacteria possess both PS I and PS II?
A. Purple sulphur bacteria
B. Cyanobacteria
C. Purple nonsulphur bacteria
D. Green sulphur bacteria
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