MCQ Bank
Which of the following is an obligate parasite?
- A) Agrobacterium tumefaciens
- B) Pythium spp.
- C) Xanthomonas campestiris pv.citri
- D) Tobacco mosaic virus
Which of the following is biotic stress?
- A) Heavy metal stress
- B) Fungal Disease
- C) Light stress
- D) Wind stress
Which of the following statements are true regarding the plants having some infectious disease?
- A) Reduced chlorophyll content
- B) Elevated chlorophyll content
- C) Reduced Transpiration
- D) Increased photosynthesis rate
Formation of cork layer in Plants helps the Plants to_________
- A) Prevents further spread of the pathogen
- B) Prevents the entry of the pathogen
- C) All of these
- D) Block the inward flow of toxic substances
In plants, an enzyme chlorophyllase secreted after disaese infection in leaves that causes conversion of chlorophyll to ____________.
- A) Chlorophyllide
- B) Tabtoxinine
- C) Phytol
- D) Both chlorophyllide and phytol
Rubisco enzyme present in the Plant tissue has a key role in______________.
- A) Water translocation
- B) Atmospheric CO2 Fixation
- C) Transpiration
- D) Root hair formation
Which of the following is not a Pathogenesis-related (PR) proteins?
- A) RUBISCO
- B) Chitinases
- C) Lipoxygenase
- D) Glucanases
Which of the followings are the Non-Essentials heavy metals for plants?
- A) Cu and Zn
- B) Ni and Co
- C) Cu
- D) Hg and Cr
Which of the following can be utilized as a signaling molecule for response against light stress?
- A) Oxygen
- B) Zn
- C) ROS
- D) CO2
FR13A rice-type has high _________level.
- A) Salinity stress
- B) Drought tolerance
- C) Cold Stress
- D) Flooding tolerance
Which of the following statement is true regarding the phytoalexins ?
- A) May be Phenolic or non phenolic compounds
- B) Don't pre exist in healthy plants
- C) All of these
- D) Low molecular weight lipophilic compounds
In which of the following Plant response against biotic stress the plant Initially keeps cells alive but kills them at later stages?
- A) Biotrophy
- B) Necrotrophy
- C) Hemibiotrophy
- D) Atophy
Which of the following statements are True regarding the pathogenesis-related protein [PR proteins?
- A) All of these
- B) Produced in resistant plant varieties
- C) Role in Plant defense
- D) Produced during Disease
The rate of _______ generally increases in diseased plants.
- A) Respiration
- B) Metabolism
- C) Transpiration
- D) All of these
Spraying methyl-Jasmonic acid onto plants increases their resistance to__________.
- A) necrotrophic fungi
- B) biotrophic fungi
- C) biotrophic bacteria
- D) Atrophic fungi
Which of the following is not a Physical Plant response against biotic stresses?
- A) Cross-linking of Cell Wall Proteins
- B) Tyloses formation
- C) Cork layer formation
- D) Swelling of the cell wall
Plant Viruses can spread from plant to plant by________
- A) Insect pests
- B) All of these
- C) Grafting
- D) Budding
Crown Gall Disease is caused by which of the following bacteria?
- A) Pythium spp.
- B) Xanthomonas campestiris pv.citri
- C) Tobacco mosaic virus
- D) Agrobacterium tumefaciens
Which of the physiological damage is caused by salt stress?
- A) Osmotic stress
- B) All of these
- C) Ion cyto-toxicity
- D) Water deficiency
Crop rotation having __________ could be one of the best management strategy for avoiding and managing herbicide resistant weeds.
- A) Different life cycle
- B) Same life cycle
- C) Selective resistance
- D) Broad-spectrum Resistance