The first line of defense against pathogen is:
Correct answer: D. Physical barrier of epidermis
- A. Gene for gene-recognition
- B. Production of oligosaccharides
- C. Production of phytoalexins
- D. Physical barrier of epidermis
Explanation
Cellulose cell walls form a physical barrier between the cells and pathogens, thus protect against infection.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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