Plant Pathology - Study Mode

[#271] Kamal bunt of wheat first time reported in Karnal by Mitra in
Correct Answer

(B) 1931

Explanation

Solution: Karnal bunt of wheat was first time reported in Karnal by Mitra in 1931. Karnal bunt is a fungal disease of wheat, durum wheat, and triticale. The disease produces dark colour and a fishy smell on infected kernels. The darkening of the kernel is a result of the kernel tissue being converted into a teliospore mass by the fungus.

[#272] The effective control of late blight of potato is possible by use of
Correct Answer

(D) All of these

Explanation

Solution: The effective control of late blight of potato is possible by the use of Sanitation measures, Spray of metalaxyl and Bordeaux mixture. Late blight, also called potato blight, disease of potato and tomato plants that is caused by the water mold Phytophthora infestans. Initial symptoms of late blight are small, light to dark green, circular to irregular-shaped water-soaked spots. Metalaxyl fungicide which comes under Phenylamide group with FARC 4, was introduced against oomycetes, is very effective for late blight management and is highly adopted worldwide.
The most commonly used for potatoes is the 2% Bordeaux, a 2 : 1 mixture of copper sulphate and hydrated lime.

[#273] The nematode Heterodera avenae is confined to the gramineae family except one single legume
Correct Answer

(D) Senebiera pinnatifolia

Explanation

Solution: The nematode Heterodera avenae is confined to the gramineae family except for one single legume which is Senebiera pinnatifolia. Heterodera avenae is a plant pathogen and an obligate parasite of cereal crops. Crops infected with this nematode are more susceptible to infection by fungal diseases such as rhizoctonia root rot. Senebiera pinnatifolia, is an annual or biennial herb with decumbent or ascending and glabrous green stems, up to 40 centimetres long, radiating from a central position.

[#274] Embryo of Sunflower has
Correct Answer

(B) Two cotyledons

Explanation

Solution: The embryo of Sunflower has two cotyledons. Helianthus is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. The plant is dicotyledonous, which means it has two cotyledons, refers that the seed has two embryonic leaves or cotyledons.

[#275] When the pollen tube enters the ovule through the integuments, the phenomenon is known as
Correct Answer

(C) Mesogamy

Explanation

Solution: When the pollen tube enters the ovule through the integuments, the phenomenon is known as Mesogamy. The integuments are the outer layer of the ovule and develop into a seed coat as the ovule matures after fertilization. Integuments encases the embryosac.