Grassland Ecosystems (Savanna, Steppes, Prairies)

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.In which of the following regions are the temperate grasslands known as 'Pampas' found?

   • A.North America
   • B.South America (Argentina)✓ Correct Answer
   • C.South Africa
   • D.Australia

   Explanation: According to NCERT Geography, temperate grasslands are named differently across continents: Prairies in North America, Pampas in South America (Argentina), Velds in South Africa, Downs in Australia, and Steppes in Eurasia.

2. Q2.Which of the following soils is typical of Temperate Grasslands (Prairies/Steppes), characterized by a deep, dark, and highly fertile organic layer?

   • A.Laterite soil
   • B.Chernozem (Mollisols)✓ Correct Answer
   • C.Podzols
   • D.Desert soils

   Explanation: Chernozem (black earth) or Mollisols are typical of temperate grasslands. They have a rich accumulation of organic matter due to the decomposition of grass roots over centuries, making them some of the most fertile agricultural soils in the world ('granaries of the world').

3. Q3.Tropical grasslands (Savannas) are characterized by which of the following vegetative combinations?

   • A.Continuous dense forest canopy
   • B.Open grass plains with widely scattered drought-resistant trees✓ Correct Answer
   • C.Only short mosses and lichens with no grass
   • D.Coniferous pine forests with understory shrubs

   Explanation: As per NCERT Geography, Savanna biomes (Tropical grasslands) represent a transition zone between tropical forests and deserts. They feature extensive grass cover with scattered, fire-resistant trees like Acacia and Baobab.

4. Q4.Why is the Savanna grassland biome often referred to as the 'Big Game Country'?

   • A.Because it hosts massive international sports events.
   • B.Due to the abundance and diversity of large wild herbivores and carnivores.✓ Correct Answer
   • C.Because the grass grows into large geometric shapes.
   • D.Due to the absence of animal life.

   Explanation: Savannas support the world's greatest abundance and diversity of large mammals (such as zebras, wildebeests, giraffes, elephants, lions, and cheetahs). Historically, this attracted hunters of large animals, giving it the name 'Big Game Country' (NCERT Geography).

5. Q5.Which morphological adaptation allows grasses in semi-arid grasslands to rapidly regrow after being grazed or burned by fire?

   • A.Thick woody bark
   • B.Presence of intercalary meristems and underground rhizomes✓ Correct Answer
   • C.Fleshy water-storing leaves
   • D.Broad canopy structure

   Explanation: NCERT Class 11 Biology Chapter 6 explains that grasses possess intercalary meristems near their nodes/bases, which remain undamaged near the ground. This, along with underground rhizomes, allows them to regenerate quickly after grazing, mowing, or fires.

6. Q6.Which of the following adaptations is characteristic of animals living in open, treeless temperate grasslands?

   • A.Prehensile tails for climbing
   • B.Burrowing behavior and fast running speeds (cursorial adaptation)✓ Correct Answer
   • C.Thick blubber layers under the skin
   • D.Bright warning coloration only

   Explanation: Because temperate grasslands are open and lack trees for hiding, animals have adapted by either burrowing underground (like prairie dogs and rodents) for safety, or by developing high running speeds (like pronghorns and bison) to escape predators.

7. Q7.In India, the high-altitude alpine grasslands of the Himalayas are locally known as:

   • A.Bugyals✓ Correct Answer
   • B.Sholas
   • C.Terai
   • D.Banni

   Explanation: In the Himalayan regions, especially in Uttarakhand, alpine meadows located above the tree line (3000m to 4000m) are locally referred to as 'Bugyals'. They serve as summer grazing grounds for pastoralists.

8. Q8.What role does fire play in maintaining a grassland ecosystem?

   • A.It destroys the grass roots permanently.
   • B.It prevents ecological succession by stopping the encroachment of woody trees and shrubs.✓ Correct Answer
   • C.It increases soil moisture content.
   • D.It eliminates all animal species.

   Explanation: Fire is a key ecological factor in grasslands. It clears dead biomass and kills woody tree saplings before they can grow and shade out the grasses. Without periodic fires, many grasslands would naturally undergo ecological succession and transition into forests.

9. Q9.The Acacia tree, common in the African Savanna, has developed which adaptation to survive grazing by giraffes?

   • A.Shedding bark continuously
   • B.Long, sharp thorns and chemical defenses like bitter tannins✓ Correct Answer
   • C.Fleshy water-filled stems
   • D.Bright red flowers

   Explanation: Acacia trees protect themselves from herbivores by growing long, sharp thorns. When browsed, they also release high levels of tannins into their leaves, which taste bitter and can be toxic to herbivores if eaten in large amounts.

10. Q10.Which of the following describes the 'Sholas' found in the Southern Western Ghats of India?

    • A.Thick thorn scrub deserts
    • B.Montane wet temperate forests interspersed with rolling grasslands✓ Correct Answer
    • C.Saltwater mangrove swamps
    • D.Deciduous sal forests

    Explanation: As per NCERT Class 11 Geography, Sholas are patches of montane wet temperate forests found in the valleys of the Nilgiris, Anaimalai, and Palani hills, separated by vast stretches of undulating grasslands.

11. Q11.The Banni grassland, one of the largest and most famous semi-arid grasslands of India, is located in:

    • A.Uttarakhand
    • B.Kutch, Gujarat✓ Correct Answer
    • C.Western Ghats, Karnataka
    • D.Sundarbans, West Bengal

    Explanation: The Banni Grassland is situated in the Kutch district of Gujarat. It is famous for its unique biodiversity, pastoral communities (Maldharis), and highly drought-resistant grass species.

12. Q12.In a typical grassland food web, which of the following is considered a primary consumer?

    • A.Acacia tree
    • B.Grasshopper✓ Correct Answer
    • C.Frog
    • D.Hawk

    Explanation: Acacia is a producer (T1). Grasshoppers eat grasses directly, making them herbivores/primary consumers (T2). Frogs (T3) and hawks (T4/T5) are carnivores (NCERT Chapter 14).

13. Q13.Which wind-adapted pollination method is dominant among grasses in open grassland ecosystems?

    • A.Entomophily (Insect pollination)
    • B.Anemophily (Wind pollination)✓ Correct Answer
    • C.Hydrophily (Water pollination)
    • D.Zoophily (Animal pollination)

    Explanation: NCERT Class 12 Biology, Chapter 2 (Sexual Reproduction in Flowering Plants) states that wind pollination (anemophily) is quite common in grasses. Because grasslands are open and windy, grasses produce large quantities of light, non-sticky pollen carried by wind.

14. Q14.Savanna trees like the Adansonia (Baobab) have swollen trunks that serve which ecological function?

    • A.Attracting birds for nesting
    • B.Storing large amounts of water to survive long dry seasons✓ Correct Answer
    • C.Excreting toxic minerals
    • D.Increasing rate of transpiration

    Explanation: The Baobab tree is adapted to the semi-arid savanna. It stores thousands of liters of water in its soft, spongy swollen trunk during the wet season, which it uses during the long dry months to prevent dehydration.

15. Q15.A major factor that prevents grasslands from naturally turning into desert biomes is:

    • A.Extremely low temperatures
    • B.Receiving intermediate annual rainfall (25 cm to 75 cm)✓ Correct Answer
    • C.High canopy cover of trees
    • D.Lack of solar radiation

    Explanation: Grasslands occur in regions where rainfall is intermediate (25-75 cm/year). This is more than what deserts receive (typically <25 cm) but less than what is required for forest growth (>75-100 cm).

16. Q16.The massive root systems of grasses in temperate grasslands serve which of the following ecological purposes?

    • A.They make the soil loose and susceptible to erosion.
    • B.They bind the soil, preventing wind and water erosion, and absorb deep soil moisture.✓ Correct Answer
    • C.They actively release toxic chemicals to prevent animal grazing.
    • D.They reduce carbon storage in soil.

    Explanation: Grass root networks are extremely dense and fibrous. They bind the topsoil, protecting it from being blown away by strong winds or washed away by rain. They also tap into deeper soil layers for water during dry seasons.

17. Q17.Which of the following is a primary threat to grassland biomes globally?

    • A.Complete lack of animal grazing
    • B.Conversion into intensive agricultural croplands due to high soil fertility✓ Correct Answer
    • C.Excessive volcanic activity
    • D.Reforestation programs

    Explanation: Because temperate grasslands have extremely fertile Chernozem soils, they are highly sought after for farming. Large areas of Prairies and Steppes have been plowed and converted into vast wheat and corn belts, leading to habitat loss.

18. Q18.In India, wet grasslands interspersed with swamps in the foothills of the Himalayas are known as:

    • A.Bugyals
    • B.Terai-Duar grasslands✓ Correct Answer
    • C.Sholas
    • D.Deccan grasslands

    Explanation: The Terai-Duar grasslands occur in the floodplains at the base of the Himalayas (Northern India, Nepal, Bhutan). They feature tall elephant grasses and swamps, supporting endangered species like the One-horned Rhinoceros and Bengal Tiger.

19. Q19.The overgrazing of grasslands by livestock leads to which of the following environmental issues?

    • A.Increased forest cover
    • B.Soil compaction, vegetation loss, and desertification✓ Correct Answer
    • C.Increased soil nitrogen levels directly
    • D.Extinction of decomposers only

    Explanation: Overgrazing strips the vegetation cover, exposes the soil to erosion, and livestock hooves compact the soil (reducing water infiltration). This degradation process can lead to desertification in semi-arid regions.

20. Q20.Which of the following grazing mammals is highly typical of the North American Prairies and was historically saved from near extinction?

    • A.Wildebeest
    • B.American Bison✓ Correct Answer
    • C.Kangaroo
    • D.Reindeer

    Explanation: The American Bison is a keystone species of the North American Prairies. Millions once roamed the plains, playing a key role in maintaining grass diversity, before being hunted to near extinction in the 19th century and later conserved.