Plant Pathology - Study Mode

[#811] Erwinia amylovora enters host tissue through
Correct Answer

(B) Nectaries

Explanation

Solution: Erwinia amylovora enters host tissue through Nectaries. Erwinia amylovora is the causative agent of fire blight, a devastating necrotic disease affecting apple, pear, and other rosaceous plants. Entry of the bacterium into plants can occur via flower blossoms or actively growing young shoots or through wounds. The infected flowers remain attached to the cluster base even as it dies, allowing for infection to spread to other flowers on the same cluster.

[#812] Enzymes taking part in glycolysis are present in
Correct Answer

(B) Cytoplasm

Explanation

Solution: Enzymes taking part in glycolysis are present in Cytoplasm. Glycolytic enzymes are located in the sarcoplasm and are associated with the sarcoplasmic reticulum. They convert glucose-6-phosphate and nicotinamide adenine dinucleotides (NAD + ) to pyruvate and NADH by producing two molecules of ATP. The enzymes of several major metabolic pathways are located within the cytoplasm, for example, glycolysis and fatty acid synthesis.

[#813] Organic compound invariably contain
Correct Answer

(A) Carbon

Explanation

Solution: Organic compound invariably contains Carbon. Organic compounds are generally chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The organic compound L-isoleucine molecule presents some features typical of organic compounds: carbon-carbon, carbon-hydrogen, as well as covalent bonds from carbon to oxygen and nitrogen.

[#814] Which one of the following fungicides is not systemic in nature
Correct Answer

(B) Thiram

Explanation

Solution: Thiram fungicides are not systemic. A SYSTEMIC fungicide may be defined as a fungicidal compound that is readily translocated as such in the plant, rendering the tissues penetrated toxic to fungi. Thiram is the simplest thiuram disulfide and the oxidized dimer of dimethyldithiocarbamate. It is used as a fungicide, ectoparasiticide to prevent fungal diseases in seeds and crops and similarly as an animal repellent to protect fruit trees and ornamentals from damage by rabbits, rodents and deer.

[#815] Which fungicide is used against Oomycetes class of fungi?
Correct Answer

(B) Metalaxyl

Explanation

Solution: Metalaxyl fungicide is used against Oomycetes class of fungi. Metalaxyl is a systemic fungicide used to control plant diseases caused by Oomycete fungi. Its formulations include granules, wettable powders, dust, and emulsifiable concentrates. Application may be by foliar or soil incorporation, surface spraying (broadcast or band), drenching and seed treatment.