How do spirochetes and spirilla differ?
a) spirilla have an external flagella but spirochetes have axial filaments.
b) spirochetes do not have a cell wall but spirilla do.
c) spirochetes and spirilla are basically the same organisms and the terms can be used interchangeably.
d) spirilla are found in chains of cells whereas spirochetes exist as individual cells.
e) spirochetes have a rigid, corkscrew shape while spirilla are helical and more flexible.

The correct answer is option A

Spirillia have an external flagella while the spirochetes enclose their flagella in the periplasm which is a small space between the outer and inner membrane, Thus , spirochetes uses axial  filaments as locomotory organs

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.