Unit 3 - Practice Quiz

1 Which of the following describes the most common shape of plant pathogenic bacteria?

2 Bacteria that have flagella distributed over the entire surface of the cell are termed:

3 Which component of the bacterial cell wall is primarily responsible for the structural difference between Gram-positive and Gram-negative bacteria?

4 The primary method of reproduction in bacteria is:

5 Which standard reference is used for the classification of bacteria based on morphological, physiological, and metabolic characteristics?

6 What is the primary distinguishing feature of Mollicutes (Phytoplasmas and Spiroplasmas) compared to true bacteria?

7 Which antibiotic are Mollicutes generally sensitive to?

8 On solid media, colonies of many Mollicutes exhibit a characteristic appearance described as:

9 Which of the following is a Fastidious Vascular Bacterium limited to the xylem vessels?

10 Candidatus Liberibacter species are generally restricted to which plant tissue?

11 A fully assembled infectious virus particle is called a:

12 The protein coat surrounding the nucleic acid of a virus is known as the:

13 Most plant viruses contain which type of genetic material?

14 Tobacco Mosaic Virus (TMV) has a morphology best described as:

15 In the context of viral replication, what happens during 'uncoating'?

16 Which mode of virus transmission involves the virus being retained in the vector for a long period, often for life, and potentially replicating within the vector?

17 Cuscuta spp. (Dodder) is classified as a:

18 The specialized absorbing organ used by phanerogamic parasites to draw nutrients from the host is called:

19 Striga species are commonly known as:

20 Orobanche spp. (Broomrape) is a parasite primarily of which plant part?

21 Which of the following is a semi-stem parasite?

22 The algal parasite Cephaleuros virescens causes which disease?

23 Bacterial genes responsible for pathogenicity are often located on:

24 What is the typical size range of plant pathogenic bacteria?

25 Phytoplasmas are primarily transmitted by which group of insects?

26 Which term describes the helical, motile nature of Spiroplasma?

27 Viral inclusion bodies are:

28 The movement of plant viruses from cell to cell occurs through:

29 Long-distance transport of viruses within the plant usually occurs via the:

30 Which of the following describes a 'multipartite' virus?

31 The transmission of viruses by aphids where the virus is carried on the stylet and lost after molting is called:

32 Striga is a partial (semi) root parasite. This means:

33 The slime layer or capsule of bacteria is chemically composed mainly of:

34 Which bacterial structure is involved in the transfer of genetic material during conjugation?

35 Which of the following is NOT a method of plant virus transmission?

36 Common symptoms of Orobanche infection in tobacco or brinjal include:

37 The term 'bacteriophage' refers to:

38 What is the function of the enzyme 'Reverse Transcriptase' in some viruses (e.g., Caulimoviruses)?

39 Gram staining differentiates bacteria based on the ability to retain which dye complex?

40 Which genus of bacteria is known for causing Crown Gall disease by transferring DNA into the plant genome?

41 Which of the following plant pathogens is eukaryotic?

42 In viral taxonomy, family names end with the suffix:

43 What is the approximate sedimentation coefficient of bacterial ribosomes?

44 Transmission of viruses through vegetative parts like tubers, bulbs, or cuttings is known as:

45 The phenomenon where a mild strain of a virus protects a plant against a severe strain of the same virus is called:

46 Which phanerogamic parasite seeds require a chemical stimulant (strigolactones) from the host root exudates to germinate?

47 Fastidious bacteria are difficult to study primarily because:

48 The enzyme commonly produced by soft-rot bacteria (e.g., Pectobacterium) to degrade the middle lamella is:

49 Nematodes can transmit plant viruses. Which shape of nematode is typically associated with virus transmission?

50 Which of the following best describes the shape of Gemini virus particles?