ROS is known to cause ?

• A) All of these
• B) Deamination
• C) Depurination
• D) Depyrimidination

Other ways in which viruses can be transmitted are through vegetative propagation, __________ and budding, seed transmission and mechanical spread by insects and man.

• A) Fission
• B) Fusion
• C) None
• D) Grafting

Which of the following theory is not True regarding the mechanism of respiratory increase in diseased plants?

• A) Augmentation in biosynthesis pathways
• B) Increased RUBISCO activity
• C) Increased activity of terminal oxidation systems
• D) Changes in respiratory pathways

Which of the following damages are not caused by Ozone to the plants?

• A) It inhibits H+-pump activity
• B) It increases membrane permeability
• C) It alters ion transport
• D) It blocks food translocation

Which of the following statement is not true regarding DOWNY MILDEW disease?

• A) Mold-like growth develops on the plants
• B) Discolored blotches appear on the leaves
• C) Fungal Disease
• D) Bluish-green leaves

. Increased activity of phenol ______ have been shown in disaeses caused by phytophthora and Fusarium species

• A) Permiease
• B) All given
• C) Reductase
• D) Oxidases

Herbicides must be used in _________ condition

• A) When necessary
• B) Frequently
• C) After intervals
• D) All given

_________ compound is known to bind heme and could inhibit catalase and ascorbate peroxidase, which detoxifies H2O2

• A) All given
• B) Carbon dioxide
• C) Carbon monooxide
• D) Nitric oxide

_____ is the non heritable physiological and biochemical gene expression to tolerate stress

• A) Acclimation
• B) Adaptation
• C) Adjustment
• D) Changing

Rate of transpiration _________in plants after certain disease infection.

• A) Decrease
• B) Decrease to one half
• C) Increase
• D) Does not affect

In some fungal and bacterial disaeses Photosynthesis is reduced because of toxins such as _____ and tentoxin secreted by the pathogen itself

• A) Tab toxins
• B) Alpha toxins
• C) Beta toxins
• D) All given

Physical blockage in xylem vessels lead to prevention in ___________?

• A) Transpiration
• B) None of these
• C) Photosynthesis
• D) water & mineral translocation

ROS production in plants is mainly localized in the

• A) mitochondria
• B) chloroplast
• C) peroxisomes
• D) Nucleus

Carotenoids are found in?

• A) Plants
• B) Micro-organisms
• C) Fungi
• D) Both A & B

CAM Plants can survive at ____________.

• A) Low temperature
• B) Without CO2
• C) Low H2O concentration
• D) None of these

_______ is responsible for the generation of ROS?

• A) Abiotic Stresses
• B) Low light intensity
• C) Wind Speed
• D) Turgor pressure

Late blight of the potato disease is caused by the bacteria __________

• A) Albugo candida
• B) Phytophthora infestans
• C) Pythium spp.
• D) Agrobacterium tumefaciens

Fungi are one of the living organisms that can cause plant disease and are the cause of about __________ percent of all plant diseases

• A) 85
• B) 60
• C) 90
• D) 20

Which environmental condition can lead to stress

• A) Water logging
• B) All given
• C) Drought
• D) Excessive soil salinity

Citrus canker is caused by the _____________

• A) Pythium spp.
• B) Phytophthora infestans
• C) Xanthomonas campestiris pv.citri
• D) Agrobacterium tumefaciens