Plant Pathology - Study Mode
[#911] Karnal bunt of wheat is discovered in
Correct Answer
(C) Haryana
Explanation
Solution: Karnal bunt of wheat is discovered in Haryana. Karnal bunt is a fungal disease of wheat, durum wheat, and triticale. It is named after Karnal, India, where the disease was first discovered on a wheat crop in 1931. The smut fungus Tilletia indica, a basidiomycete, invades the kernels and obtains nutrients from the endosperm, leaving behind waste products with a disagreeable odour that makes bunted kernels too unpalatable for use in flour or pasta.
[#912] The Downey mildew of bajra is caused by
Correct Answer
(C) S. graminicola
Explanation
Solution: The Downey mildew of bajra is caused by S. graminicola. One of the most important diseases of pearl millet is downy mildew, also known as green ear, caused by the fungus Sclerospora graminicola. The resting spores of the fungus in the soil constitute the primary source of inoculum. Once the infection is established on a plant, the fungus sporulates and the spores are dispersed to create secondary infections within the crop. The fungus is systemic and infects plants in all stages of development.
[#913] A plant pollinated by bats is
Correct Answer
(C) Kigellia
Explanation
Solution: A plant pollinated by bats is Kigellia. Kigelia is a genus of flowering plants in the family Bignoniaceae. The flowers (and later the fruit) hang down from branches on long flexible stems. Some birds are attracted to the flowers and the strong stems of each flower make ideal footholds. Their scent is most notable at night indicating that they are adapted to pollination by bats, which visit them for pollen and nectar.
[#914] Photorespiration is characteristic of
Correct Answer
(A) C 3 plants
Explanation
Solution: Photorespiration is characteristic of C 3 plants. Photorespiration happens in C 3 plants when the CO 2 concentration drops to about 50 ppm. The key enzyme that accomplishes the fixing of carbon is rubisco, and at low concentrations of CO 2 , it begins to fix oxygen instead.
[#915] Fishy smell found in wheat field infected with karnal bunt is because of
Correct Answer
(B) Trimethylamine
Explanation
Solution: The fishy smell found in wheat fields infected with karnal bunt is because of Trimethylamine. Karnal bunt attacks durum wheat, rye, and triticale, a hybrid of wheat and rye. The smut fungus Tilletia indica, a basidiomycete, invades the kernels and obtains nutrients from the endosperm, leaving behind waste products with a disagreeable odor. The disease produces dark color and a fishy smell on infected kernels. The odour is caused by the production of trimethylamine by the fungus.