Plant Pathology - Study Mode

[#501] Puccinia path in India is given by
Correct Answer

(A) Nagarajan & Joshi

Explanation

Solution: Puccinia path in India is given by Nagarajan & Joshi. The defined dispersal route from South to North is called the "Puccinia Path" of India. Unlike North America, the spread from the Nilgiris to central India is an independent event and there is no feedback of inoculum to the Nilgiris. Long distance spread of the airborne wheat stem rust uredospores depends on upper-air weather patterns. Trajectories of the airborne inoculum at the 700 mb level led fro the nilgiris, the southern area to the secondary foci of infection.

[#502] Leaf spot or tikka disease of groundnut is/are caused by
Correct Answer

(C) Both A and B

Explanation

Solution: Leaf spot or tikka disease of groundnut is/are caused by Cercospora arachidicola and Cercosporidium personatum. Peanut leaf spots are caused by two different fungi: Nothopassalora personata (previously known as Cercosporidium personatum) causes late leaf spots and Passalora arachidicola (previously known as Cercospora arachidicola) causes early leaf spots. It is one of the most detrimental foliar diseases of groundnut. This disease, due to its drastic reduction of photosynthetic tissues in plant foliar parts, leads to about 70% yield loss in susceptible cultivars.

[#503] Bacterial disease are controlled by use of chemicals
Correct Answer

(C) Antibiotics

Explanation

Solution: Bacterial diseases are controlled by the use of chemicals called Antibiotics. An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting bacterial infections, and antibiotic medications are widely used in the treatment and prevention of such infections. They may either kill or inhibit the growth of bacteria. A limited number of antibiotics also possess antiprotozoal activity.

[#504] Concentration of agar in pour plate technique is
Correct Answer

(C) 1.5%

Explanation

Solution: Concentration of agar in the pour plate technique is 1.5%. Agar is typically used in a final concentration of 1 - 2% for solidifying culture media. Smaller quantities (0.05 - 0.5%) are used in media for motility studies and the growth of anaerobes (0.1%) and microaerophiles. In these media, the agar which is an unbranched long chain of polysaccharides is added in the concentration of 1.5. Most commonly, 1.3% agar is used to prepare solid media in labs.

[#505] CAM occurs in
Correct Answer

(D) Fleshy green leaves

Explanation

Solution: CAM occurs in Fleshy green leaves. Crassulacean acid metabolism (CAM) is a photosynthetic adaptation to periodic water supply, occurring in plants in arid regions (e.g., cacti) or in tropical epiphytes (e.g., orchids and bromeliads). CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions that allows a plant to photosynthesize during the day, but only exchange gases at night.