Plant Pathology - Study Mode

[#401] Tea rust is caused by
Correct Answer

(D) Algae

Explanation

Solution: Tea rust is caused by Algae. 'Red rust' caused by Cephaleuros parasiticus Karst is the most important and lone algal disease of tea. The regular incidence of this disease and its effect on the growth and vigour as well as the yield potential of tea called for investigation into the phenology and appropriate remedy of this disease.

[#402] When half the leaves are removed randomly, transpiration will show
Correct Answer

(A) Lower magnitude but higher flux

Explanation

Solution: When half the leaves are removed randomly, transpiration will show lower magnitude but higher flux. Less number of leaves offers less opportunity for transpiration, therefore the rate of transpiration will be lower on magnitude but flux is higher. Transpiration (T) is the flux of water vapour and latent energy returned to the atmosphere by vascular plants, mainly through the stomatal pores on their foliage and concurrent with photosynthesis.

[#403] Sperm and egg nuclei fuse due to
Correct Answer

(D) Attraction of their protoplasts

Explanation

Solution: Sperm and egg nuclei fuse due to attraction of their protoplasts. The two gametes i.e., sperm released by pollen tube and egg move in opposite direction by an unknown mechanism but most probably by streaming currents of cytoplasm i.e., due to attraction of their protoplasts. The nucleus of one male gamete fuses with the egg nucleus and the phenomenon is called fertilization.

[#404] In 2005, which pathological scientist got Borlaug award
Correct Answer

(D) S. Nagarajan

Explanation

Solution: In 2005, S. Nagarajan, pathological scientist got Borlaug award. The Borlaug Award is an award recognition conferred by a fertilizer company, Coromandel International, for outstanding Indian scientists for their research and contributions in the field of agriculture and environment. Nagarajan, who is internationally respected as a wheat pathologist, has been recognized with the Borlaug award of the Coromandel Fertilizers (2004 - 2005) for his contribution to the advancement of the wheat program, pathology of wheat rusts and its elimination, and as an educator.

[#405] A major use of embryo culture is in
Correct Answer

(B) Overcoming hybridisation barriers

Explanation

Solution: A major use of embryo culture is in overcoming hybridization barriers. Embryo culture is a technique for cultivating an embryo under aseptic conditions on a nutrient medium. It is performed with mature embryos and helps mainly in shortening the period of germination by overcoming seed dormancy and any barriers to overcoming hybridization.