Fudrjant fern of injection is:

Correct Answer: A

Rationale: The correct answer is A: Continuous infection with long incubation period. Fudrjant fern of injection is a term used to describe an infection that is continuously present in the body after being introduced through injection. The long incubation period refers to the time between the injection and when symptoms of the infection become apparent. This choice is correct as it accurately describes the characteristics of fudrjant fern of injection. Choice B is incorrect because chronic infections typically have a long duration, not a short incubation period. Choice C is incorrect as immediate infections would not have a long incubation period. Choice D is incorrect because a 'sleeping' infection implies a dormant state, not continuous presence in the body as seen in fudrjant fern of injection.

Correct Answer: B

Rationale: The correct answer is B: Gram negative coccobacillus. Bordetella pertussis, the causative agent of pertussis, is a gram-negative coccobacillus. This is because it is a small, rod-shaped bacterium that appears both as a bacillus (rod-shaped) and a coccus (spherical) shape. It does not retain the crystal violet stain in the Gram staining process, indicating its negative gram nature. Choice A is incorrect because pertussis is not a gram-positive bacillus. Choice C is incorrect because pertussis is not a long gram-negative rod-shaped bacterium. Choice D is incorrect as the other options do not accurately describe the morphology of Bordetella pertussis.

Correct Answer: C

Rationale: The correct answer is C: Plague. Yersinia pestis is a bacterium that causes plague, a serious infectious disease transmitted through infected fleas or direct contact with infected animals. Yersinia pestis does not cause Cholera (choice A) or AIDS (choice B). Choice D, None of the above, is incorrect as Yersinia pestis is indeed the causative agent of plague.

Correct Answer: B

Rationale: The correct answer is B: glycocalyx. The glycocalyx is a matrix formed outside the plasma membrane that consists of glycoproteins and glycolipids. It plays crucial roles in cell-cell recognition, protection, and immune response. Cytoplasm (A) is the gel-like substance inside the cell, not outside. Exoplasm (C) is not a recognized term in biology. Cell wall (D) is a rigid structure found in plant cells, not outside the plasma membrane in all cells.

Correct Answer: B

Rationale: The correct answer is B: streptococci. This term refers to beadlike chains of cocci formed after cell division along a single axis. "Diplococci" (A) are pairs of cocci, "tetrads" (C) are groups of four cocci, and "sarcinae" (D) are cube-like groups of eight cocci. Streptococci is the most appropriate term for describing the specific arrangement mentioned in the question.