#2161

Which chemical agent is utilized to induce male sterility in maize (Zea mays)?

(a) Gossypium

(b) Helianthus

(c) Potato

(d) Zea mays

Explanation: Mendok is a chemical gametocide used to induce male sterility in maize. Male sterility prevents the production of functional pollen, which is a critical tool in hybrid seed production to facilitate cross-pollination without the need for manual detasseling. By inhibiting pollen development, breeders can ensure that the female parent is fertilized exclusively by the desired male parent, thereby maintaining the purity of the hybrid seed.

#2162

During which developmental phase does the infection of maize by the smut fungus (Ustilago maydis) typically occur?

(a) After flowering

(b) Vegetative stage

(c) Reproductive stage

(d) Before sowing

Explanation: Ustilago maydis, the pathogen responsible for corn smut, infects maize plants primarily during the vegetative growth stage. The fungus invades the meristematic tissues of the host. As the plant develops, the pathogen induces the formation of characteristic tumor-like galls on various aerial parts, including leaves, stems, and ears, which are filled with teliospores. This infection disrupts normal plant development and reduces overall grain yield.

#2163

Which chemical, when applied as a foliar spray at the onset of flower bud development, may enhance drought resistance in peas?

(a) I.A.A.

(b) Chlormequat

(c) Diuron

(d) D.D.T.

Explanation: Chlormequat chloride is a plant growth regulator that acts as an inhibitor of gibberellin biosynthesis. By reducing cell elongation, it promotes sturdier, thicker stems. In various studies, exogenous application of Chlormequat has been shown to improve the water-use efficiency and drought tolerance of certain crops, including peas, by altering plant morphology and physiological responses to water stress during critical growth stages.

#2164

What was the recorded average concentration of atmospheric carbon dioxide as of May 2022?

(a) 421 ppm

(b) 380 ppm

(c) 500 ppm

(d) 305 ppm

Explanation: Scientific monitoring stations, such as the Mauna Loa Observatory, recorded the atmospheric carbon dioxide concentration at approximately 421 parts per million (ppm) in May 2022. This value reflects the ongoing upward trend in greenhouse gas concentrations, which is a primary driver of global warming and associated environmental shifts in agricultural ecosystems.

#2165

Under what circumstances may third parties gain access to an auditor's working papers?

(a) The working papers may be obtained by third parties when they appear to be relevant to issues raised in litigation

(b) The safe custody of working papers is the responsibility of client, if kept at his premises

(c) Working papers must be kept by the audit firm for at least 10 years

(d) Successor auditors may access working papers of predecessor auditors only after client approval

Explanation: Working papers are the property of the auditor and are confidential. However, they may be disclosed to third parties if required by law, such as during legal proceedings where the papers are deemed relevant evidence, or with the explicit authorization of the client.

#2166

What are the various types of audit opinions an auditor may issue in a formal audit report?

(a) Unqualified opinion

(b) Qualified opinion

(c) Adverse opinion

(d) All of the above

Explanation: An auditor's report communicates the results of the audit process. The four primary types of opinions are: an unqualified opinion, which indicates the statements are fair; a qualified opinion, which notes specific exceptions; an adverse opinion, which indicates the statements are materially misstated; and a disclaimer of opinion, which is issued when the auditor cannot obtain sufficient evidence. These options allow the auditor to accurately reflect the state of the financial records.

#2167

What term refers to the specific amounts that individuals may deduct from their income to determine their taxable income, as established by parliament annually?

(a) Production

(b) Budget

(c) Contribution

(d) Sales

Explanation: Personal allowances are set as part of the annual budget process. These allowances reduce the total income subject to taxation. The budget serves as the legislative vehicle through which these fiscal policies and tax thresholds are adjusted and enacted by the government each year.

#2168

Which of the following audit types may be applicable to the banking sector?

(a) Statutory audit

(b) Concurrent audit

(c) Balance sheet audit

(d) All of the above

Explanation: Banks are subject to various types of audits. A statutory audit is required by law, a concurrent audit is a systematic examination of transactions on a continuous basis, and a balance sheet audit focuses on verifying the assets and liabilities reported at the end of the period. All these methods are commonly utilized in banking.

#2169

A diet consisting exclusively of milk, eggs, and bread may lead to a deficiency of which nutrient, potentially causing a specific disease?

(a) Marasmus

(b) Scurvy

(c) Rickets

(d) Night blindness

Explanation: Milk, eggs, and bread are generally poor sources of Vitamin C (ascorbic acid). A prolonged deficiency of Vitamin C leads to scurvy, a condition characterized by weakness, anemia, and gum disease. While the diet might be sufficient in protein and calories, it lacks essential micronutrients found in fresh fruits and vegetables.

#2170

Who is credited with the discovery and reporting of the breakage-fusion-bridge cycle in Zea mays?

(a) Barbara McClintock

(b) Wilhelm Johannsen

(c) None of the above

(d) Thomas Morgan

Explanation: Barbara McClintock, a pioneering geneticist, discovered the breakage-fusion-bridge cycle while studying maize (Zea mays) chromosomes. This cycle explains how chromosomes with broken ends can fuse, replicate, and break again during subsequent cell divisions, leading to genetic instability. Her work on this phenomenon, along with her discovery of transposable elements, fundamentally changed our understanding of genome structure and dynamics.

#2171

When a dominant allele is lost due to a deletion, the recessive allele on the homologous chromosome may be expressed. What is this phenomenon called?

(a) Pseudodominance

(b) Dominance

(c) None of the above

(d) Co-dominance

Explanation: Pseudodominance occurs when a recessive trait is expressed because the dominant allele that would normally mask it has been deleted or inactivated. This is often used in genetic mapping to identify the location of recessive genes on a chromosome.

#2172

Evaluate the following statements regarding aneuploidy: 1. Aneuploidy can result from mitotic nondisjunction leading to chromosome loss. 2. Aneuploidy is generally less viable in diploid organisms compared to polyploids. 3. True aneuploids possess complete genomes plus additional chromosomal fragments. 4. False aneuploids may involve the presence of supernumerary chromosomes.

(a) 1, 2, 3 and 4 are true

(b) Only 1, 2 and 3 are true

(c) Only 2, 3 and 4 are

(d) Only 1 is true

Explanation: Aneuploidy involves an abnormal number of chromosomes. Mitotic errors can cause chromosome loss. Diploids are more sensitive to dosage imbalances than polyploids, which have redundant sets. True aneuploidy involves partial genome changes, while false aneuploidy (or hyperploidy) often involves supernumerary chromosomes like B-chromosomes. All four statements accurately describe the biological mechanisms and viability constraints associated with aneuploid states in various organisms.

#2173

Which internal agents within an organism may influence mutagenic effects?

(a) Mutators

(b) Antimutators

(c) All of the above

(d) Antimutagens

Explanation: Internal biological agents can modulate mutation rates. Mutator genes increase the frequency of mutations, while antimutators and antimutagens act to reduce or repair DNA damage, thereby lowering the mutation rate. All these factors interact within the cellular environment to maintain genomic stability or drive genetic variation.

#2174

Which biological kingdom encompasses eukaryotic organisms that may be unicellular or simple multicellular?

(a) Plantae

(b) Protista

(c) Monera

(d) Fungi

Explanation: The kingdom Protista is a diverse group of eukaryotic organisms that do not fit into the plant, animal, or fungal kingdoms. It includes a wide variety of unicellular and simple multicellular organisms, such as algae, protozoa, and slime molds, which exhibit complex cellular structures.

#2175

To which botanical classification does maize (Zea mays) belong?

(a) Gymnosperms

(b) Dicot

(c) none of these

(d) Monocot

Explanation: Maize is a classic example of a monocotyledonous plant. Monocots are characterized by having a single cotyledon in the seed, parallel leaf venation, and vascular bundles scattered throughout the stem. These features distinguish them from dicotyledonous plants, which typically possess two cotyledons and a net-like leaf venation pattern.

#2176

What was Adolf Mayer's initial hypothesis regarding the transmission of the Tobacco Mosaic Virus?

(a) fungal infection

(b) viral infection

(c) malaria infection

(d) bacterial infection

Explanation: In 1886, Adolf Mayer demonstrated that the tobacco mosaic disease could be transmitted from infected plants to healthy ones by applying sap. At that time, he hypothesized that the disease was caused by a small bacterium, as he could not isolate a visible pathogen using the techniques available. It was later discovered by others that the causative agent was actually a virus, which is much smaller than bacteria.

#2177

In what year did Adolf Mayer describe the mosaic disease of tobacco?

(a) 1850

(b) 1950

(c) 1883

(d) 1900

Explanation: Adolf Mayer, a German agricultural chemist, published his findings on the infectious nature of tobacco mosaic disease in 1883, demonstrating that it could be transmitted from diseased to healthy plants.

#2178

Acid present in acid rain may be__________________?

(a) both A and B

(b) none

(c) H2SO4

(d) HNO3

Explanation: Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.

#2179

Acid present in acid rain may be_________________?

(a) none of the above

(b) HNO3

(c) both A and B

(d) H2SO4

Explanation: Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.

#2180

The density of water may be__________________?

(a) Equal to that of ice

(b) Less than that of ice

(c) Greater than that of ice

(d) All are possible

Explanation: Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.

May 2025 Current Affairs MCQs & Solutions

Which chemical agent is utilized to induce male sterility in maize (Zea mays)?

During which developmental phase does the infection of maize by the smut fungus (Ustilago maydis) typically occur?

Which chemical, when applied as a foliar spray at the onset of flower bud development, may enhance drought resistance in peas?

What was the recorded average concentration of atmospheric carbon dioxide as of May 2022?

Under what circumstances may third parties gain access to an auditor's working papers?

What are the various types of audit opinions an auditor may issue in a formal audit report?

What term refers to the specific amounts that individuals may deduct from their income to determine their taxable income, as established by parliament annually?

Which of the following audit types may be applicable to the banking sector?

A diet consisting exclusively of milk, eggs, and bread may lead to a deficiency of which nutrient, potentially causing a specific disease?

Who is credited with the discovery and reporting of the breakage-fusion-bridge cycle in Zea mays?

When a dominant allele is lost due to a deletion, the recessive allele on the homologous chromosome may be expressed. What is this phenomenon called?

Which internal agents within an organism may influence mutagenic effects?

Which biological kingdom encompasses eukaryotic organisms that may be unicellular or simple multicellular?

To which botanical classification does maize (Zea mays) belong?

What was Adolf Mayer's initial hypothesis regarding the transmission of the Tobacco Mosaic Virus?

In what year did Adolf Mayer describe the mosaic disease of tobacco?

Acid present in acid rain may be__________________?

Acid present in acid rain may be_________________?

The density of water may be__________________?