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Agriculture & Forestry Past Paper MCQs
Agriculture & Forestry 2025 MCQs
1 / 20
The solar radiation that bounces back in the atmosphere is mostly:
Infrared radiation constitutes the majority of reflected solar energy (Earth's albedo). Gamma (A), alpha (B), and X-rays (C) are either absorbed or minimally reflected.
2 / 20
Nitrogen is absorbed by plant roots in the form of:
Plants primarily absorb nitrogen as nitrate (NO₃⁻) or ammonium (NH₄⁺). NO₂ (B) and N₂O (C) are toxic or gaseous forms.
3 / 20
In 1992 - 93, the great decline in cotton production was due to the attack of:
The Cotton Leaf Curl Virus (CLCuV) epidemic devastated Pakistan’s cotton crop in the early 1990s, transmitted by whiteflies.
4 / 20
Sex nucleus which fuses with another in sexual reproduction is known as:
Gametes (sperm/egg) fuse during fertilization. Spores (C) are asexual reproductive units.
5 / 20
Inbreeding leads towards depression in productivity in:
Cross-pollinated crops (e.g., maize) suffer inbreeding depression due to increased homozygosity. Self-pollinated crops (A) are naturally inbred.
6 / 20
As per principles of crop rotation, pulses should be included in rotation to:
Pulses fix atmospheric nitrogen via rhizobia, enhancing soil fertility (C). While (A) and (D) are benefits, (C) is the agronomic principle.
7 / 20
Nipping in chickpea is a practice used to:
Nipping (removing apical buds) reduces height (B), prevents lodging (A), and promotes branching (C) for higher yields.
8 / 20
The country that leads as highest in wheat productivity in the world is:
China leads in total wheat production, though smaller nations (e.g., Netherlands) may have higher yield per hectare.
9 / 20
Raising of only one crop in a year when there is a seasonal supply of water is called:
Mono-cropping cultivates a single crop annually, typical in arid regions with limited water. Monoculture (B) refers to repeated single-crop planting.
10 / 20
National climate change policy was prepared in:
Pakistan’s National Climate Change Policy was approved in 2012 to address vulnerabilities like water scarcity and extreme weather.
11 / 20
Conversion of the organic form of an element into an inorganic form is termed as:
Mineralization decomposes organic matter (e.g., proteins) into inorganic ions (e.g., NH₄⁺). Immobilization (B) is the reverse process.
12 / 20
About 80% of the phosphorus transported from soil to root surface is through:
Phosphorus moves via diffusion (slow movement along concentration gradients). Root interception (B) accounts for minimal uptake.
13 / 20
In gel electrophoresis, DNA is separated on the basis of:
DNA fragments migrate through a gel matrix based on molecular size (smaller fragments travel farther). Charge (A) is uniform (negative phosphate backbone).
14 / 20
Range area refers to a large semi - arid area having vegetation suitable for:
Range areas are grasslands/shrublands managed for livestock grazing (B). While they provide fuel (A) and shade (D), their primary purpose is forage.
15 / 20
Neem tree is used for:
The neem tree (Azadirachta indica) is renowned for its medicinal properties. Its leaves, bark, and seeds contain compounds like azadirachtin, which have antifungal, antibacterial, and antiviral effects. While neem wood (A) is durable, it is secondary to its medicinal uses.
16 / 20
Crossing of a hybrid individual with any one of its parents is called:
A backcross involves crossing a hybrid (F1) with a parent to reinforce desired traits. Test crosses (C) determine genotype purity.
17 / 20
Which of the following is not an essential plant nutrient?
Cadmium (D) is a toxic heavy metal. Molybdenum (A), copper (B), and chloride (C) are micronutrients.
18 / 20
Genome D of wheat is most probably contributed by:
Hexaploid wheat (Triticum aestivum, AABBDD) derives its D genome from the wild grass Triticum tauschii (syn. Aegilops tauschii). T. aestivum (A) is the resulting hybrid, not the donor.
19 / 20
A structure for diverting the flow of water in a river is called:
A dyke (or levee) is an embankment built to divert or control river flow. Gully plugs (B) prevent erosion, dams (C) store water, and sunken dams (D) are subsurface barriers.
20 / 20
Crop plants that protect the soil surface from erosion are called:
Cover crops (e.g., clover) reduce erosion by shielding soil. Nurse crops (A) assist seedlings; trap crops (C) lure pests.
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