Plant Pathology - Study Mode
[#526] Select the nematode(s) which act as vectors of plant viruses
Correct Answer
(D) All of these
Explanation
Solution: Xiphinema index, Longidorus, and Trichodorus are the nematodes that act as vectors of plant viruses. The only known nematode vectors are in the genera Xiphinema and Longidorus. Tobraviruses are straight tubular particles with two size ranges, 180 - 210 nm and 45 - 115 nm. Trichodorus and Paratrichodorus are vectors. Nematodes acquire viruses by feeding on infected plants and transmitting them during subsequent feeding on non-infected plants.
[#527] Which type of spores of Puccinia graminis tritici infect the barberry plant
Correct Answer
(D) Basidiospores
Explanation
Solution: Basidiospores type of spores of Puccinia graminis tritici infects the barberry plant. Graminis tritici, the fungus causing stem rust of wheat, the haploid basidiospores can infect barberry but not wheat, and the haploid mycelium can grow only in barberry. There the fungus produces structures called pycnia, and sexual reproduction occurs with cross-fertilization between two different mating types of pycnia. Then the fertilized fungus grows down through the barberry leaf.
[#528] Which is a wrong combination?
Correct Answer
(D) Na-Protein
Explanation
Solution: Here, N 2 -Amino acid, Fe-Cytochrome, and Mg-Chlorophyll are the correct combinations, whereas, Na-Protein is the wrong combination. Sodium is not essential for the synthesis of protein. Nitrogen is one of the main body components, required for protein synthesis and production of several nitrogenous compounds such as hormones, neurotransmitters, and components of antioxidant defense. Protein combining or protein complementing is a dietary theory for protein nutrition that purports to optimize the biological value of protein intake.
[#529] Fertilisers containing free acid should be packed in
Correct Answer
(A) HDEP bags
Explanation
Solution: Fertilizers containing free acids should be packed in HDEP bags. As these are water-resistant with poor air permeability, safe, and resistant to chemicals. HDPE is High-density polyethylene, these are plastic bags are undoubtedly the most common in the world. The chemical composition of HDPE features long chains of straight molecules that are very linear from start to finish, HDPE polymers have minimal branching.
[#530] Nitrogen is applied in splits to
Correct Answer
(A) Increase its efficiencly
Explanation
Solution: Nitrogen is applied in splits to Increase its efficiency. Splitting Nitrogen into two applications allows the plant to utilize the N quicker and more efficiently. A split nitrogen application allows you to hold back a significant portion of nitrogen until the plant is ready to utilize it. By reducing the amount of Nitrogen simply sitting in the soil, you prevent the potential for loss.