Plant Pathology - Study Mode

[#451] Pigments of PS I occurs in
Correct Answer

(B) Stromal thylakoids and nonappressed parts of granal thylakoids

Explanation

Solution: Pigments of PS I occurs in Stromal thylakoids and non appressed parts of granal thylakoids. Photosystem I and photosystem II are the two multi-protein complexes that contain the pigments necessary to harvest photons and use light energy to catalyze the primary photosynthetic endergonic reactions producing high-energy compounds. The PSI is located in the stroma lamella of the thylakoid while the PSII is in the stacked grana domain.

[#452] Nutrient uptake by crops is fastest during
Correct Answer

(C) Active growth

Explanation

Solution: Nutrient uptake by crops is fastest during Active growth. Nutrient uptake by roots accounts for nearly all nutrient uptake under natural and cultivated conditions, but foliar uptake is important under some circumstances. Nutrients are taken up by roots mainly as inorganic ions from the soil solution. The rate of uptake depends primarily on the concentration in the soil solution immediately adjacent to the root. Soil water content is important because it affects root growth and nutrient transport to the root surface in both the water flux created by transpiration and the diffusive flux towards or away from the root.

[#453] Which of the following nutrient elements is responsible for the die back of citrus?
Correct Answer

(B) Cu

Explanation

Solution: Cu is the nutrient element that is responsible for the dieback of citrus. Citrus dieback, also known as 'chlorosis' or neglectosis is not a specific disease but a syndrome expressing many disorders in the plant that leads to a decline in productivity, reduced productive life, and poor fruit quality. Copper-deficient plants show dark green and enlarged leaves. Sterns are more slender than normal and appear flat and angular. Limbs die back and gumming may occur under new bark or on fruits.

[#454] Development of sporophyte from gametophytic tissue without fusion of gametes is
Correct Answer

(B) Apogamy

Explanation

Solution: Development of sporophyte from gametophytic tissue without fusion of gametes is Apogamy. Apogamy is the development of sporophytes directly from gametophytic tissue without the fusion of gametes. Apogamy is a related term that has had various meanings over time. In plants with independent gametophytes (notably ferns), the term is still used interchangeably with "apomixis", and both refer to the formation of sporophytes by parthenogenesis of gametophyte cells.

[#455] Dinocap (methyl heptyl dinitrophenyl crotonate) is sold in market as
Correct Answer

(D) Karathane

Explanation

Solution: Dinocap (methyl heptyl dinitrophenyl crotonate) is sold in the market as Karathane. KARATHANE is the best Contact powdery mildewicide and is significantly better at controlling powdery mildew infestation on woody parts of the crops/plants. It is especially effective for the control of Powdery Mildew and certain Mites on Roses, Ornamentals and Flowers. Karathane is a wettable powder and should be mixed with water at the rate of 1 teaspoonful per Rallon.