Free Forest Ecology MCQs with Answers

• A. Desert plant
• B. Parasite
• C. Water plant
• D. Terrestrial plant

Explanation: Eichhornia crassipes, commonly called water hyacinth, is a free-floating aquatic plant.

• A. Antagonism
• B. Parasitism
• C. Endemism
• D. Symbiosis

Explanation: Mycorrhiza is a mutually beneficial association between a fungus and plant roots: the fungus improves nutrient and water absorption, while…

• A. Hydrophytes
• B. Submerged hydrophytes
• C. Xerophytes
• D. Mesophytes

Explanation: Submerged hydrophytes generally lack stomata because their entire leaf surface is in contact with water, allowing direct exchange of…

• A. Mesophytes
• B. Xerophytes
• C. Hydrophytes
• D. Heliophytes

Explanation: Hydrophytes develop extensive aerenchyma, air-filled tissue that provides buoyancy and transports oxygen to submerged tissues.

• A. Mineral soil
• B. None of the above
• C. Unweathered material like rock
• D. Litter

Explanation: The A0 horizon is the surface organic layer, made mainly of freshly fallen and partly decomposed litter.

• A. Water lettuce
• B. Hydrilla
• C. Lotus
• D. Chara

Explanation: Chara is a green alga, not an angiosperm. Hydrilla, lotus, and water lettuce are flowering plants and therefore angiosperms.

• A. Sand
• B. Clay
• C. Graved
• D. Loam

Explanation: Clay has very small pores and poor drainage, so water moves through it slowly and waterlogging develops readily.

• A. Physiologically wet
• B. Physically dry
• C. Physiologically dry
• D. None of the above

Explanation: Waterlogged soil may contain abundant water but very little oxygen, so plant roots cannot absorb water normally; this condition is…

• A. Xerophytes
• B. Mesophytes
• C. Halophytes
• D. Hydrophytes

Explanation: Hydrophytes commonly possess water pores or hydathodes, structures associated with the removal or release of excess water.

• A. Thorn forests
• B. Evergreen forests
• C. Deciduous forests
• D. Grasslands

Explanation: Prosopis, Acacia, and Capparis are drought-tolerant, often thorny woody plants typical of tropical thorn forests.

• A. Sibling
• B. Endemic
• C. Allopatric
• D. Sympatric

Explanation: An endemic species is native to and restricted to a particular geographical area.

• A. Sandy
• B. Clayey
• C. Laterite
• D. Alluvial

Explanation: Material deposited by rivers is called alluvium, consisting of transported mixtures of sand, silt and clay.

• A. Edaphotropism
• B. Edaptic factor
• C. Pedogenesis weathering
• D. Edaphic climax

Explanation: Pedogenesis is the process of soil formation and development from parent material through weathering and other soil-forming processes.

• A. To grant mechanical support
• B. To draw water from deeper zones
• C. Due to light factor
• D. None of the above

Explanation: Xerophytes commonly develop deep or extensive root systems to reach water stored in deeper soil layers.

• A. In lakes and streams
• B. In rivers
• C. On polar ice and glaciers
• D. Underground

Explanation: Most of Earth's freshwater is frozen in polar ice caps and glaciers, especially the Antarctic ice sheet and Greenland ice sheet.

• A. Drought escaping
• B. Drought resisting
• C. Drought enduring
• D. None of these

Explanation: Ephemeral xerophytes survive dry periods by completing their life cycle rapidly during brief wet seasons, so they are drought-escaping…

• A. Halophyte
• B. Xerophyte
• C. Mesophyte
• D. Hydrophyte

Explanation: Acacia arabica, now commonly called Vachellia nilotica, is adapted to dry habitats and is therefore classified as a xerophyte.

• A. Saprophytic association between fungus and the roots of seed plants
• B. Parasitic association between fungus and the roots of seed plant
• C. Symbiotic association between fungus and the roots of seed plants
• D. All of the above

Explanation: Mycorrhiza is a generally mutualistic symbiotic association between a fungus and the roots of a seed plant.

• A. Plant community
• B. Environment
• C. Radiation
• D. A species

Explanation: Autecology studies a single species and its relationship with the environment.

• A. Reproductive ecology
• B. Autecology
• C. Synecology
• D. Ecological niche

Explanation: Autecology examines one species throughout its life cycle, including how environmental factors affect it.