Plant Pathology - Study Mode

[#826] The causal organism Neovossia indica produces
Correct Answer

(D) Teliospores

Explanation

Solution: The causal organism Neovossia indica produces Teliospores. Karnal bunt also known as partial bunt is a fungal disease of wheat, durum wheat, and triticale. The smut fungus Neovossia indica, a basidiomycete, invades the kernels and obtains nutrients from the endosperm. The darkening of the kernel is a result of the kernel tissue being converted into a teliospore mass by the fungus. A teliospore that has successfully attached to a susceptible host will germinate to produce what is known as a promycelium.

[#827] Which of the following is not a disease of apple
Correct Answer

(D) Bunchy top

Explanation

Solution: The bunchy top is not a disease of apples, whereas all other given in options affect apples. Birds eye : The disease appears first as dark red spots on the berry. Later, these spots are circular, sunken, and ashy-gray and in late stages, these spots are surrounded by a dark margin which gives them the "bird's-eye rot" appearance. Powdery mildew: It is caused by the fungus Podosphaera leucotricha, which forms a dense white fungal growth (mycelium) on the host tissue and affects: the leaves and buds. Downey mildew: Downy mildew is a disease of foliage, caused by a fungus-like (Oomycete) organism. It is spread from plant to plant by airborne spores.

[#828] J. C. Luthra and his associates developed the solar heat treatment of wheat seeds for the control of
Correct Answer

(B) Loose smut

Explanation

Solution: J. C. Luthra and his associates developed the solar heat treatment of wheat seeds for the control of Loose smut. This treatment is also termed Luthra's solar energy treatment. In this, The seeds are soaked in cold water for 4 hours in the forenoon on a bright summer day followed by spreading and drying the seeds in the hot sun for four hours in the afternoon. It is proved to be very effective against loose smut of wheat and covered smut of barley.

[#829] Sporogenesis is
Correct Answer

(A) Development and formation of spores

Explanation

Solution: Sporogenesis is the development and formation of spores. Sporogenesis is the production of spores. The term is also used to refer to the process of reproduction via spores. Reproductive spores were found to be formed in eukaryotic organisms, such as plants, algae and fungi, during their normal reproductive life cycle. Sporogenesis occurs in reproductive structures termed sporangia. The process involves sporogenous cells undergoing cell division to give rise to spores.

[#830] Double fertilization and triple fusion were discovered by
Correct Answer

(B) Nawaschin and Gruignard

Explanation

Solution: Double fertilization and triple fusion were discovered by Nawaschin and Gruignard. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte with two male gametes (sperm). It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. The pollen grain then takes in moisture and begins to germinate, forming a pollen tube that extends down toward the ovary through the style.