1. Which of the following is an adaptation of desert plants to conserve water?
a) Large leaves
b) Thick cuticle
c) Bright flowers
d) Shallow roots
Answer: b) Thick cuticle
2. Which structure in desert plants helps reduce water loss?
a) Large stomata
b) Small, waxy leaves
c) Broad leaves
d) Flowers with high water content
Answer: b) Small, waxy leaves
3. Why do some desert plants have deep roots?
a) To absorb more sunlight
b) To find water from deep underground
c) To store food
d) To increase air circulation
Answer: b) To find water from deep underground
4. Which plant feature helps in reducing transpiration in desert plants?
a) Chloroplasts
b) Stomatal closure
c) Large leaves
d) Increased leaf surface area
Answer: b) Stomatal closure
5. What is the main adaptation of plants in the tundra to survive cold temperatures?
a) Large, broad leaves
b) Thick bark
c) Small leaves or no leaves
d) Extensive root system
Answer: c) Small leaves or no leaves
6. Why do some plants in arctic regions grow close to the ground?
a) To prevent water loss
b) To avoid strong winds and freezing temperatures
c) To access more sunlight
d) To avoid predators
Answer: b) To avoid strong winds and freezing temperatures
7. What is the purpose of succulent leaves in desert plants?
a) To store food
b) To trap more sunlight
c) To store water
d) To help in reproduction
Answer: c) To store water
8. Which of the following is an adaptation of mangrove plants to survive in saline water?
a) Ability to float on water
b) Salt excretion through glands
c) Small leaves with thick cuticles
d) Large, deep roots
Answer: b) Salt excretion through glands
9. How do desert plants protect themselves from herbivores?
a) By producing toxic chemicals
b) By growing flowers only during the night
c) By having smooth stems
d) By growing in clusters
Answer: a) By producing toxic chemicals
10. What is the primary function of the thick bark of certain trees in cold climates?
a) To store water
b) To protect against cold temperatures
c) To trap sunlight
d) To deter herbivores
Answer: b) To protect against cold temperatures
11. Why do some plants in the desert have reflective surfaces?
a) To attract pollinators
b) To reflect sunlight and reduce heat absorption
c) To store water
d) To avoid herbivores
Answer: b) To reflect sunlight and reduce heat absorption
12. What is the function of the thick, waxy coating on cactus stems?
a) To store water
b) To absorb sunlight
c) To prevent water loss
d) To protect against herbivores
Answer: c) To prevent water loss
13. How do plants in the desert reduce their metabolic activity?
a) By closing stomata at night
b) By entering dormancy during extreme heat
c) By reducing leaf size
d) By absorbing moisture from the air
Answer: b) By entering dormancy during extreme heat
14. Which adaptation helps plants in the rainforest survive during the wet season?
a) Large, waxy leaves
b) Epiphytic growth
c) Thick cuticles
d) Small leaf size
Answer: b) Epiphytic growth
15. What helps plants survive in extreme heat during the day in the desert?
a) Large leaf surface area
b) Transpiration
c) Nocturnal photosynthesis
d) Cactus spines
Answer: c) Nocturnal photosynthesis
16. How do alpine plants survive freezing conditions?
a) By producing antifreeze proteins
b) By growing under the snow
c) By growing rapidly during short summers
d) By growing long, flexible stems
Answer: a) By producing antifreeze proteins
17. Which of the following helps desert plants avoid herbivores?
a) Toxic leaves
b) Bright-colored flowers
c) Deep roots
d) Wide leaves
Answer: a) Toxic leaves
18. What type of root system helps desert plants survive dry conditions?
a) Shallow, wide root systems
b) Deep, extensive root systems
c) Adventitious roots
d) Fibrous roots
Answer: b) Deep, extensive root systems
19. Why do some desert plants have spines instead of leaves?
a) To increase water absorption
b) To reduce the surface area for transpiration
c) To attract pollinators
d) To store food
Answer: b) To reduce the surface area for transpiration
20. What is the primary function of the deep root systems in plants living in arid environments?
a) To anchor the plant
b) To store water
c) To search for underground water
d) To avoid herbivores
Answer: c) To search for underground water
21. Which of the following is a survival mechanism for plants in saline habitats like salt marshes?
a) Floating seeds
b) Salt filtration through roots
c) Ability to grow in full sunlight
d) Small, waxy leaves
Answer: b) Salt filtration through roots
22. What adaptation allows tundra plants to survive in cold, dry conditions?
a) Small, round leaves
b) Large leaves to absorb sunlight
c) High chlorophyll concentration
d) Thick waxy coating on leaves
Answer: a) Small, round leaves
23. How do plants in the desert avoid excessive water loss?
a) By having long roots
b) By having nocturnal transpiration
c) By closing stomata during the day
d) By having deep leaves
Answer: c) By closing stomata during the day
24. How do carnivorous plants like the Venus flytrap adapt to nutrient-poor soil?
a) By absorbing nitrogen from the air
b) By using their leaves to capture and digest insects
c) By growing large root systems
d) By reducing transpiration
Answer: b) By using their leaves to capture and digest insects
25. What is an adaptation of plants in the tropical rainforest to deal with excess water?
a) Epiphytic growth
b) Deep roots
c) Water storage in leaves
d) Wide, shallow roots
Answer: a) Epiphytic growth
26. What adaptation do plants in the desert have to survive extreme heat?
a) Large flowers for water storage
b) Photosynthesis at night
c) Thin leaves for transpiration
d) Deep underground stems
Answer: b) Photosynthesis at night
27. What is the role of CAM (Crassulacean Acid Metabolism) in desert plants?
a) To store water in roots
b) To perform photosynthesis at night
c) To open stomata during the day
d) To absorb nitrogen from the air
Answer: b) To perform photosynthesis at night
28. How do some aquatic plants adapt to high salinity in water?
a) By producing salt-excreting glands
b) By growing larger leaves
c) By floating on the surface
d) By having a high water content in leaves
Answer: a) By producing salt-excreting glands
29. What is the function of the air pockets in aquatic plants like water lilies?
a) To help in buoyancy
b) To store water
c) To prevent herbivores
d) To perform photosynthesis underwater
Answer: a) To help in buoyancy
30. Why do some plants in cold environments have hairy leaves?
a) To capture moisture from the air
b) To reflect sunlight
c) To protect against freezing winds
d) To store food
Answer: c) To protect against freezing winds
