All Free Forestry MCQs with Answers

• A. Hekistotherms
• B. Megatherms
• C. Microtherms
• D. Mesotherms

Explanation: Hekistotherms are plants adapted to very cold conditions and are therefore associated with alpine vegetation.

• A. Desiccation
• B. Thermal death
• C. Chilling
• D. Freezing

Explanation: Chilling injury occurs when a plant adapted to warm conditions is exposed to low, non-freezing temperatures.

• A. Tropical zone
• B. Sub-tropical zone
• C. Temperate zone
• D. Alpine zone

Explanation: In the western Himalayas, Betula, especially Betula utilis, forms high-elevation birch woodland near the upper tree line and into the…

• A. Low K+ concentration and high O.P
• B. High K+ concentration and low O.P
• C. Low K+ concentration and low O.P
• D. High K+ concentration and high O.P

Explanation: Heliophytes tolerate intense light by maintaining a relatively high osmotic pressure, while their potassium concentration is comparatively…

• A. High Temperature
• B. Low temperature
• C. Temperature below freezing
• D. Temperature above 45 degree C

Explanation: Exposure of germinating seeds to a required period of low temperature induces vernalization, which promotes flowering in many plants.

• A. Pore size
• B. Soil organisms
• C. All of these
• D. Type of roots

Explanation: Soil-air composition depends on how easily gases move through pore spaces, on microbial and other organismal respiration, and on root…

• A. Percentage of reflected light by a surface
• B. Percentage of solar absorption
• C. Turbidity of solar radiations
• D. Amount of light absorbed by forests

Explanation: Albedo is the fraction or percentage of incoming solar radiation reflected by a surface.

• A. Lodging
• B. Salt spray
• C. Erosion
• D. Injuries

Explanation: Plants growing near seashores commonly develop adaptations such as thick leaves, salt exclusion, or salt excretion to withstand salt…

• A. 1-2%
• B. 3-5%
• C. 5-10%
• D. 20-30%

Explanation: Forest canopies generally reflect only a small fraction of incoming solar radiation, with albedo commonly approximated at about 5–10%.

• A. Sciophytes
• B. None of these
• C. Helophytes
• D. Chasmophytes

Explanation: Chasmophytes are plants specialized for growing in rock fissures or crevices.

• A. Epilimnion
• B. Hypolimnion
• C. Metalimnion
• D. Thermocline

Explanation: The hypolimnion is the deep, cold water layer beneath the thermocline, where temperature is relatively uniform and no marked gradient…

• A. 40 meters
• B. 400 meters
• C. 200 meters
• D. 5 meters

Explanation: Ultraviolet radiation can penetrate clear seawater to roughly 200 metres, although penetration varies with water clarity and wavelength.

• A. Heliophytes
• B. Chasmophytes
• C. Chersophytes
• D. Sciophytes

Explanation: Facultative heliophytes can tolerate or grow under reduced light and are therefore associated with shade-tolerant, sciophytic behaviour.

• A. Twisted leaves
• B. Horizontally oriented leaves
• C. Dropping leaves
• D. Vertically oriented leaves

Explanation: Heliophytes are adapted to strong sunlight, and their leaves are commonly held vertically or obliquely to reduce excessive midday…

• A. Clements
• B. Raunkiaer
• C. Odum
• D. Warming

Explanation: Raunkiaer classified plant groups by temperature into categories such as megatherms, mesotherms and microtherms.

• A. About 1%
• B. 0.35%
• C. 0.90%
• D. 3%

Explanation: Argon makes up approximately 0.9% of the atmosphere, commonly given as about 0.93% by volume.

• A. 14%
• B. 3 - 5%
• C. 7 - 8%
• D. About 1%

Explanation: Only about 1% of incoming solar energy is converted into stored chemical energy by plants because photosynthetically active radiation is…

• A. Reaction wood formation
• B. Absence of secondary growth
• C. Absence of tylosis
• D. All of these

Explanation: Reaction wood develops in response to mechanical stress, including strong, persistent wind, and helps the stem maintain or regain its…

• A. Social and antagonistic
• B. Social and reciprocal
• C. Nutritive and antagonistic
• D. Nutritive and reciprocal

Explanation: Fungal and bacterial parasitism involves obtaining nourishment from the host while harming it, so the relationship is nutritive and…

• A. Above 32′
• B. In the hydrosphere
• C. Between 32′ - 64′ from soil level
• D. At the soil surface

Explanation: Air density is greatest at the soil surface because atmospheric pressure is highest there due to the weight of the overlying air.