Question

Puccinia graminis tritici causes
A. Yellow rust
B. White rust
C. Black rust
D. Brown rust

Answer 1

Puccinia graminis causes rust parasites that need two disconnected host plants, for example, wheat and barberry, to finish their life cycle. It is a huge sort that is some of the time isolated into four genera and comprises heteroecious parasitic organisms having 2-celled teliospores whose pedicels do not gelatinize.

Complete answer:
Wheat leaf rust is a parasitic illness that influences wheat, grain, and rye stems, leaves, and grains. In mild zones, it is ruinous on winter wheat because the microorganism overwinters. Diseases can pave the way to 20% yield misfortune, which is exacerbated by biting the dust leaves, which prepare the parasite. The microorganism is a Puccinia rust organism. Puccinia graminis causes "stem or black rust"
Plants do not normally show evident sickness side effects until 7 to 15 days after contamination when the oval pustules (uredinia) of fine, block red urediniospores get through the epidermis. Infinitesimally, these red spores are covered with fine spines.
The pustules might be bountiful and delivered on both leaf surfaces and stems of grass. Later in the season, pustules (telia) of black teliospores start to show up in contaminated grass species. Minutely, teliospores are two-celled and thick-walled.

Hence, the correct answer is option (C).

Additional information:
Yellow rust is a parasitic illness that transforms the harvest's leaves into a yellowish tone and stops the photosynthesis movement, which inevitably could bring about a drop in wheat crop profitability. It is brought about by P. striiformis.
White rust is an infection in plants brought about by the oomycete Albugo candida or one of its nearby family members. Plants helpless to this infection, for the most part, incorporate individuals from the Brassica family.
P. triticina causes "leaf or brown rust". This rust sickness happens in any place wheat, grain, and other oat crops are developed.

Note: On leaf sheaths and glumes, pustules burst the epidermis, giving a battered appearance. Towards the finish of the developing season, black telia are delivered. Thus, stem rust is otherwise called 'black rust'. The telia are solidly appended to the plant tissue. The site of contamination is a noticeable indication of the illness. Puccinia graminis is the causal operator of stem rust. In most rust organisms, just the teliospores are adjusted to endure separation from a living host plant for an excess of a couple of months under field conditions.