A lake with nutrients is called:

A. Trophic
B. Eutrophic
C. Oligotrophic
D. Euphotic

Percentage of water left in the soil when a plant wilts is known as:

A. Turgidity
B. Wilting coefficient
C. Field capacity
D. Water retaining power of the soil

Plants die from prolonged water logging because:

A. Soil nutrients become very dilute
B. Root respiration stops
C. Nutrients leach down due to excessive water
D. Cell sap in plant becomes too dilute

Which one of the following pairs is mismatched?

A. Savanna – Acacia trees
B. Prairie – Epiphytes
C. Coniferous forest – Evergreen trees
D. Tundra – Permafrost

Relative to shoots, the roots can be very massive in plants of:

A. Deserts
B. Lakes and ponds
C. Mixed temperate forests
D. Mixed tropical forests

Mycorrhiza is the phenomenon of:

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

The grasslands do not possess the horizon layers:

A. A00
B. A1
C. Both (a) & (b)
D. A00 and A1

In western Himalayas, the Betula trees usually occur in:

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

At which latitude, heat grain through insolation approximately equals heat loss through terrestrial radiation?

A. 42 1/2? North and South
B. 22 1/2? North and South
C. 60? North and South
D. 40? North and South

Which of the following plants does not show predation?

A. Darlingtonia
B. Viscum
C. Both (a) & (b)
D. Cephalotus