TestUstad

All Free Forestry MCQs with Answers

Every Forestry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.

1,681 questions · page 21 of 85

401. The organic matter, generally 0.5 - 0.8% to about 75 - 100 cm depth, drops to about 0.3% at ______.

  • A. Lower depths
  • B. Upper depths
  • C. Middle depths
  • D. None of these

Explanation: Organic matter normally decreases with depth because plant residues and roots are concentrated near the surface, so it falls to about 0.3%…

Read the full explanation →
Correct answer: Lower depths

402. The calcium carbonate content which is usually between 6 and 10%, has reached into the deeper layers, forming a zone of lime nodules (Kankar) at about _____ depth:

  • A. 70-100 cm
  • B. 90-120 cm
  • C. 80-110cm
  • D. None of these

Explanation: The described kankar or lime-nodule zone occurs at roughly 90–120 cm depth in these soils.

Read the full explanation →
Correct answer: 90-120 cm

403. Water-logging is a serious problems, with water-table within _____ over the greater part of the area:

  • A. 5m
  • B. 6m
  • C. 7m
  • D. 8m

Explanation: A water table within 5 m of the surface is shallow enough to create widespread waterlogging and restrict root aeration.

Read the full explanation →
Correct answer: 5m

404. The deserts of Pakistan is:

  • A. Siahan
  • B. All of the above
  • C. Thal
  • D. Cholistan
  • E. Thar

Explanation: Siahan, Thar, Thal and Cholistan are all recognized desert regions of Pakistan, although they differ in location and landscape character.

Read the full explanation →
Correct answer: All of the above

405. The bacteria, which reduce nitrates in the soil to gaseous nitrogen, are known as denitrifying bacteria such as:

  • A. Nitromonas
  • B. Nostoc
  • C. Pseudomonas
  • D. Rhizobium

Explanation: Pseudomonas carries out denitrification, converting nitrates into gaseous nitrogen that returns to the atmosphere.

Read the full explanation →
Correct answer: Pseudomonas

406. Removal of top soil by soil erosion result in the loss of soil:

  • A. Nitrites
  • B. Nitric and nitrous acids
  • C. Nitrogen
  • D. Nitrates

Explanation: Erosion removes nutrient-rich topsoil, including soluble nitrate compounds, so the soil loses nitrates along with organic matter and other…

Read the full explanation →
Correct answer: Nitrates

407. The transfer of food energy from the sources in plants through a series of organisms with repeated stages of eating and being eaten is known as:

  • A. Food chain
  • B. Food web
  • C. Food link
  • D. Food way

Explanation: A food chain is a linear sequence in which energy passes from plants or other producers through organisms that eat one another.

Read the full explanation →
Correct answer: Food chain

408. Short and simple food chains are rare in the world and may be found in simple ecosystems like:

  • A. Savanna
  • B. Tundra
  • C. Grassland
  • D. Desert

Explanation: Tundra ecosystems have low plant diversity and limited primary production, so they commonly support short and simple food chains.

Read the full explanation →
Correct answer: Tundra

409. Desertification is:

  • A. Use of the desert for good of mankind
  • B. Control of the desert
  • C. Spread of the desert
  • D. None of these

Explanation: Desertification is the degradation of productive land into desert-like conditions, commonly through drought, vegetation loss and…

Read the full explanation →
Correct answer: Spread of the desert

410. An association between two organisms belonging to different species, which live together for mutual benefit or on partner gets benefit and other, is neither benefited nor harmed is known as:

  • A. Predation
  • B. Parasitism
  • C. None of these
  • D. Symbiosis

Explanation: Symbiosis is a close association between different species and includes mutualism, where both benefit, and commensalism, where one…

Read the full explanation →
Correct answer: Symbiosis

411. Symbiotic association in which both the partners get benefit and neither cansurvive without the other is called:

  • A. Mutualism
  • B. Commensalism
  • C. Parasitism
  • D. None of these

Explanation: Mutualism is an interaction in which both species benefit; when both are dependent on the association for survival, it is often called…

Read the full explanation →
Correct answer: Mutualism

412. A striking example of ______ is that of a ruminant animal such as a cow and the bacteria that live in its gut:

  • A. Parasitism
  • B. Commensalism
  • C. Mutualism
  • D. None of these

Explanation: Gut bacteria help cows digest cellulose and obtain food and shelter in return, so both partners benefit.

Read the full explanation →
Correct answer: Mutualism

413. A symbiotic association between fungus and roots of higher plants is known as:

  • A. Lichen
  • B. None of these
  • C. Mutualism
  • D. Mycorrhiza

Explanation: Mycorrhiza is the association between fungal hyphae and plant roots, in which the fungus commonly receives carbohydrates while improving…

Read the full explanation →
Correct answer: Mycorrhiza

414. An association between a fungus and an alga is known as:

  • A. None of these
  • B. Mycorrhiza
  • C. Mutualism
  • D. Lichen

Explanation: A lichen is a composite association of a fungus with an alga or, in some cases, a cyanobacterium.

Read the full explanation →
Correct answer: Lichen

415. The symbiotic association in which one partner gains benefit without benefiting or harming the other is known as:

  • A. Commensalism
  • B. Lichen
  • C. Mutualism
  • D. None of these

Explanation: Commensalism is a +/0 interaction: one organism gains a benefit while the other is neither helped nor harmed.

Read the full explanation →
Correct answer: Commensalism

416. Barnacles attached to the backs of whales and turtles, get a free ride to better riding places, in an example of:

  • A. Lichen
  • B. Mutualism
  • C. Commensalism
  • D. Mycorrhiza

Explanation: Barnacles benefit by being transported to food-rich locations, while the whale or turtle is generally neither significantly helped nor…

Read the full explanation →
Correct answer: Commensalism

417. The back and forth movements of chemical elements, between organisms and environment along characteristic circular paths and known as:

  • A. None of these
  • B. Ecological cycles
  • C. Chemical cycles
  • D. Biochemical cycles

Explanation: Biochemical cycles describe the circulation of elements such as carbon, nitrogen and phosphorus between organisms and the physical…

Read the full explanation →
Correct answer: Biochemical cycles

418. Which element is vital to plants and animals for the synthesis of proteins and nucleic acies?

  • A. Nitrogen
  • B. Oxygen
  • C. Carbon
  • D. None of these

Explanation: Nitrogen is a structural component of amino acids in proteins and nitrogenous bases in nucleic acids.

Read the full explanation →
Correct answer: Nitrogen

419. The earth's atmosphere contains over _____ % by volume of nitrogen gas:

  • A. 58
  • B. 78
  • C. 68
  • D. None of these

Explanation: Nitrogen makes up approximately 78% of Earth’s atmosphere by volume, mainly as N₂ gas.

Read the full explanation →
Correct answer: 78

420. The transfer of food energy from the source in plants through a series of organism with repeated stages of eating and being eaten is known as:

  • A. Food web
  • B. None of these
  • C. Food cycle
  • D. Food chain

Explanation: A food chain is a linear sequence through which energy passes from plants to successive consumers by eating and being eaten.

Read the full explanation →
Correct answer: Food chain
Start Free Forestry Practice MCQs Test