Vocabulary and Synonyms

 Diverse means differing. "Among all of the diverse things in nature" or Among all of the different things in nature". Hence, differing is correct.

Dolorous means expressing or causing pain, grief, or sorrow. It describes something that is sad or painful in nature. 'Sorrowful' is the correct synonym as it directly relates to grief and sadness, which is the core meaning of dolorous. The other options (sullen, dross, navigation) are unrelated - sullen means gloomy or bad-tempered, dross means waste matter, and navigation relates to directing movement.

Dormant means temporarily inactive, asleep, or not currently active but capable of becoming active. 'Inactive' (option C) is the correct answer as it directly captures the state of not being active. While 'Sleeping' (option B) is related, dormant has a broader meaning - it can apply to volcanoes, seeds, diseases, or any inactive state. 'Rapture' means intense pleasure, which is unrelated.

Stubborn means refusing to change opinions, actions, or decisions despite attempts to persuade. 'Rigid' is the correct answer as it captures the inflexibility and unwillingness to bend or change that characterizes stubbornness. Dour means stern or gloomy in manner, random means without pattern, and acquire means to obtain - none of these capture the essence of stubbornness.

Senility refers to the physical and mental decline associated with old age, including weakness, memory loss, and impaired judgment. 'Dotage' (option A) is the correct answer as it specifically means the period of life when someone is old and weak, often implying mental decline. The other options are unrelated - expand means to increase, sensitive means responsive to feelings, and 'None of these' is incorrect.

"Untidy"

 To discount something means to play it down or show little value to it. Hence, disregard is synonymous.

Dowdy describes something or someone that is unfashionable, plain, and lacking in style, often referring to clothes or appearance. 'Untidy' is the closest match among the options as dowdy implies a lack of neatness and style. While not a perfect synonym (dowdy specifically relates to fashion/appearance), it captures the essence better than unrelated words like vary, home, or the catch-all 'None of these'.

Dross refers to waste material, scum, or impurities that form on the surface of molten metal during smelting. More generally, it means anything worthless or trivial. 'Waste matter' is the correct answer as it directly captures the meaning of dross as worthless material. The other options (waiter, blues) are completely unrelated to the concept of waste or impurities.

Duplicity means deceitfulness, double-dealing, or being two-faced - specifically pretending to have one set of beliefs or intentions while actually having another. 'Hypocrisy' is the correct answer as both terms describe deceptive behavior where outward appearance differs from inner reality. Happy and halogen are unrelated words - halogen is actually a chemical element.

Efficient means working well without wasting time, effort, or resources - achieving maximum productivity with minimum waste. 'Effective' is the correct answer as it closely relates to producing desired results. While not identical (effective focuses on results, efficient focuses on the process), it's the best match. Advertise and arrange are unrelated actions.

 Discursive is synonymous to rambling. Something that is discursive is often rambling on and on.

Diva originally meant a distinguished female opera singer, particularly a prima donna. While modern usage sometimes carries connotations of being demanding or temperamental, the primary meaning is still 'opera singer'. 'Opera singer' is the correct answer. The other options (merry, emanate) are unrelated - emanate means to originate or flow out.

Doggerel refers to crude, poorly constructed, or irregular verse that is often comic or trivial in nature. It's poetry lacking artistic merit. 'Poor verse' is the correct answer as it directly captures the essence of doggerel as substandard poetry. The other options (rich person, mad, draw) are completely unrelated to poetry or verse.

Doddering describes someone, typically elderly, who is shaky, unsteady, or trembling in movement due to age or weakness. 'Shaky' is the correct answer as it directly captures the unsteadiness that doddering describes. Shadow and sepoy are unrelated (sepoy was an Indian soldier under British rule), and brilliance is the opposite of weakness.