Plant Pathology - Study Mode
[#191] Abnormal increase in size of plant organ due to the increase in the number of cells is called as
Correct Answer
(A) Hyperplasia
Explanation
Solution: An abnormal increase in the size of plant organs due to the increase in the number of cells is called Hyperplasia. It is an enlargement of an organ or tissue caused by an increase in the amount of organic tissue that results from cell proliferation. Hyperplasia may be due to any number of causes, including the proliferation of the basal layer of the epidermis.
[#192] Tent toxin is produced by which of the following fungus?
Correct Answer
(B) Alternaria alternata
Explanation
Solution: Tent toxin is produced by Alternaria alternata among the following fungus. Alternaria alternata is a fungus that has been recorded to cause leaf spots and other diseases on over 380 host species of plant. This host-specific mycotoxin is called fumonisin B 1 . It was identified and confirmed by research conducted on fast atom bombardment and ion spray mass spectrometry.
[#193] Common scab is checked by
Correct Answer
(A) Wet soil
Explanation
Solution: Common scab is checked with Wet soil. A common scab of potatoes is a soil-borne disease caused by the bacteria-like organism Streptomyces scabies. It's been reported that increasing soil moisture to 80 - 85 percent during tuber initiation until tubers are 1 - 1.5 inches in size can reduce common scab incidence.
[#194] PEP is CO 2 acceptor in
Correct Answer
(A) C 4 plant
Explanation
Solution: PEP is a CO 2 acceptor in the C 4 plant. C 4 carbon fixation is one of three known photosynthetic processes of carbon fixation in plants. CO 2 is initially fixed in the mesophyll cells by the enzyme PEP carboxylase which reacts the three-carbon phosphoenolpyruvate (PEP) with CO 2 to form the four-carbon oxaloacetic acid (OAA). Thus, PEP is the first acceptor of CO 2 in C 4 plants.
[#195] The composition of Bordeaux paste is
Correct Answer
(B) 1 kg Copper sulphate + 1 kg lime + 10 kg gallon water
Explanation
Solution: The composition of Bordeaux paste is 1 kg Copper sulphate + 1 kg lime + 10 kg gallon water. Bordeaux mixture is a combination of copper sulphate, lime, and water and is an effective fungicide and bactericide that has been used for decades to control diseases of fruit and nut trees, vine fruits and ornamental plants. The original formula developed by Millardet contains 5 lbs of CuSO 4 + 5 lbs of lime + 50 gallons of water. The ultimate mixture contains a gelatinous precipitate of copper hydroxide and calcium sulphate, which is usually sky blue. Cupric hydroxide is the active principle and is toxic to fungal spores.