All Free Agriculture MCQs with Answers
Every Agriculture question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
2,315 questions · page 85 of 116
- A. Fungi
- B. Bacteria
- C. Virus
- D. None of the above
Explanation: Fungi lack chlorophyll and therefore cannot manufacture food by photosynthesis; they obtain nutrients from organic matter or living hosts.
Correct answer: Fungi- A. Amino acid
- B. Valine
- C. Auxins
- D. Cytokmins
Explanation: 2,4-D is a synthetic auxin, or auxin-like herbicide, that causes uncontrolled growth in susceptible broadleaf weeds.
Correct answer: Auxins- A. 10-20%
- B. 5-15%
- C. 20-50%
- D. 20-60%
Explanation: Weed competition in rice can cause substantial yield loss, commonly reported within the broad range of about 20 to 60%, depending on weed…
Correct answer: 20-60%- A. Saprophytes
- B. Parasites
- C. Obligatory parasites
- D. Bacteria
Explanation: Saprophytes obtain nutrients from dead and decaying organic matter rather than producing their own food.
Correct answer: Saprophytes- A. Pest and insect management
- B. Weed and pest management
- C. Disease and pest management
- D. non of these
Explanation: Allelochemicals released by plants can suppress the germination or growth of weeds and may also affect certain pests, making them useful…
Correct answer: Weed and pest management- A. Soil management
- B. non of these
- C. Water management
- D. Weed management
Explanation: Allelopathy is especially useful in integrated weed management because crop residues or root exudates can naturally inhibit weed…
Correct answer: Weed management- A. Both a and b
- B. weed seed
- C. Crop seeds
- D. non of these
Explanation: Annual ryegrass can release root-associated allelochemicals that inhibit the germination and early growth of both crop and weed seeds.
Correct answer: Both a and b1688. Effects of allelopathic compound in the life cycle of plants cause inhibition of________________?
- A. Seed deterioration
- B. seed germination
- C. Seed swelling
- D. non of these
Explanation: A common effect of allelochemicals is inhibition of seed germination, often followed by reduced seedling growth.
Correct answer: seed germination- A. Bacterial disease
- B. Fungal disease
- C. Viral disease
Explanation: Cotton root rot is caused by the soil-borne fungus Phymatotrichopsis omnivora, so it is a fungal disease.
Correct answer: Fungal disease- A. Allelopathy
- B. Allergy
- C. Parasitism
- D. Antagorusm
Explanation: Allelopathy is the chemical inhibition or stimulation of one plant by substances released by another living plant.
Correct answer: Allelopathy- A. Virus
- B. Bacteria
- C. Fungi
- D. non of these
Explanation: Bt cotton contains a gene from the soil bacterium Bacillus thuringiensis, which produces Cry proteins toxic to certain bollworm larvae.
Correct answer: Bacteria- A. Cotton leaf cover virus
- B. cotton leaf cotton virus
- C. cotton leaf curl virus
- D. cotton leaf complete virus
Explanation: CLCV expands to cotton leaf curl virus, a major virus disease of cotton transmitted mainly by the whitefly Bemisia tabaci.
Correct answer: cotton leaf curl virus- A. Defoliant
- B. Aerosol
- C. Persistence
- D. Desiccant
Explanation: Persistence is the ability of a pesticide to remain active on or in the treated material for a period, usually because it has low…
Correct answer: Persistence1694. The concentration of a toxicant that kills 50% of the exposed organism is called_________________?
- A. LD75
- B. LD50
- C. None of the Above
- D. LC50
Explanation: LC50 means the lethal concentration that kills 50% of an exposed population.
Correct answer: LC50- A. Poison
- B. Poisonous material
- C. None of the Above
- D. Both of them
Explanation: A toxicant is a poisonous material or substance capable of producing harmful effects in an organism.
Correct answer: Poisonous material- A. Adjuvant
- B. Adhesive
- C. Carrier
- D. Agitation
Explanation: A carrier is the inert material used to dilute and distribute a pesticide’s active ingredient, such as water, dust or an oil-based…
Correct answer: Carrier- A. Bait
- B. Acute poisoning
- C. Chronic poisoning
- D. Defoliant
Explanation: A defoliant causes leaves to drop from a plant, either by accelerating leaf abscission or damaging foliage.
Correct answer: Defoliant- A. Vitamin K
- B. Atropine
- C. Diazepam
- D. Earbiturate
Explanation: Vitamin K restores the production of clotting factors disrupted by anticoagulant rodenticides and is therefore their specific antidote.
Correct answer: Vitamin K- A. None of the Above
- B. Diazepam
- C. Earbiturates
- D. Atropine
Explanation: Atropine blocks excessive muscarinic stimulation caused by organophosphate and carbamate poisoning, relieving signs such as salivation…
Correct answer: Atropine- A. Formulation
- B. Dose
- C. Active ingredient
- D. Inert ingredient
Explanation: A formulation is the usable pesticide product made by combining the active ingredient with inert substances such as carriers, solvents or…
Correct answer: Formulation