Ecological Plant Groups (Multiple Choice Questions and Answers)

Ecological Plant Groups

Multiple Choice Questions and Answers

1. Heterophyllous plants are found as

(a) free floating hydrophytes

(b) submerged hydrophytes

(c) rooted and floating hydrophytes

(d) halophytes

Answer: (c) rooted and floating hydrophytes

2. Among the following which is not a characteristic of hydrophyte?

(a) abundant air spaces and air chambers

(b) plentiful xylem and sclerenchyma

(c) leaves having stomata only on the upper side or none

(d) poor fruit development

Answer: (b) plentiful xylem and sclerenchyma

3. Hydrophytes have

(a) well developed roots

(b) well developed stomata

(c) less mechanical system as well as feebly developed vascular system

(d) none

Answer: (c) less mechanical system as well as feebly developed vascular system

4. Plants growing near sea shore will usually have xerophytic characters like thick leaves because

(a) there is plenty of water in the soil

(b) there is too high a concentration of salts for the plants to absorb sufficient water from soil

(c) light available to the plants is insufficient

(d) the soil is physically dry

Answer: (b) there is too high a concentration of salts for the plants to absorb sufficient water from soil

5. An aquatic plant with floating leaves have

(a) stomata on both leaf surfaces

(b) stomata on petiole only

(c) stomata on upper surface

(d) stomata on lower surface

Answer: (c) stomata on upper surface

6. Plants such as Pandanus and Rhizophora are examples of

(a) xerophytes

(b) mesophytes

(c) hydrophytes

(d) halophytes

Answer: (d) halophytes

7. In general, a plant most likely to survive in area where temperature is high, relative humidity is low and wind prevalent, would have leaves

(a) large and broad

(b) large intercellular air spaces

(c) reduced palisade tissue

(d) small and narrow

Answer: (d) small and narrow

8. Hydrilla and Vallisneria are examples of

(a) submerged aquatic plants

(b) floating aquatic plants

(c) aquatic plants with floating leaves

(d) amphibious plants with dimorphic leaves

Answer: (a) submerged aquatic plants

 9. Which group of plants has to face physiological dryness?

(a) halophytes

(b) lithophytes

(c) hydrophytes

(d) epiphytes

Answer: (a) halophytes

 10. Desert plants have longer root system because

(a) high temperature of soil encourageous root growth

(b) low temperature at night encourageous root growth

(c) those plants adapted to produce long root system can survive better in a desert

(d) roots grow in search of water

Answer: (c) those plants adapted to produce long root system can survive better in a desert

 11. Which of the following is not the characteristic feature of the anatomy of xerophytes?

(a) spongy parenchyma

(b) well-developed conducting tissue

(c) well developed mechanical tissue

(d) thick cuticle

Answer: (a) spongy parenchyma

 12. In submerged hydrophytes the functional stomata are found

(a) on the upper surface of leaf

(b) on the lower surface of leaf

(c) on both surfaces of leaf

(d) no where

Answer: (d) no where

13. Leaves of desert grasses often roll their leaves to

(a) protect growing apex

(b) reduce respiration

(c) check loss of water by transpiration

(d) none

Answer: (c) check loss of water by transpiration

 14. In which of the following the seed germinates while still attached with the main plant?

(a) Mango

(b) Rhizophora

(c) Screwpine

(d) Coconut


(b) Rhizophora

15. Vivipary is the condition where

(a) seed germinates within the fruit

(b) seeds sprouts out when fruit is still attached to tree

(c) seed germinates inside fruit when it falls down

(d) none of these

Answer: (b) seeds sprouts out when fruit is still attached to tree

16. Swollen spongy petioles are present in

(a) Eichhornia

(b) Pistia

(c) Hydrilla

(d) Laminaria

Answer: (a) Eichhornia

17. Typha is a

(a) submerged hydrophyte

(b) emerged hydrophyte

(c) floating hydrophytes

(d) attached hydrophyte with floating leaves

Answer: (a) submerged hydrophyte

18. The basis of classification of plants into hydrophytes, mesophytes and xerophytes is

(a) availability of water

(b) tolerance to light

(c) tolerance to temperature

(d) tolerance to salinity and rain

Answer: (b) tolerance to light

19. Which of the following individual character can provide relatively better adaptability for plants growing in deserts

(a) well-developed root system

(b) succulent leaves

(c) reduction of leaf surface

(d) thick cuticle

Answer: (b) succulent leaves

20. Among hydrophytes, finely dissected leaves occur in

(a) rooted floating leaved plants

(b) submerged plants

(c) emerged plants

(d) free floating plants

Answer: (a) rooted floating leaved plants

21. What type of leaves are present in Ranunculus aquatilis?

(a) simple entire

(b) homophyllous

(c) heterophyllous

(d) pinnately compound

Answer: (d) pinnately compound

22. Which of the plants is devoid of roots?

(a) Azolla

(b) Ceratophyllum

(c) Hydrilla

(d) Vallisneria

Answer: (c) Hydrilla

23. Presence of water table near soil surface results in

(a) shallow roots

(b) extensive roots

(c) curved roots

(d) long roots

Answer: (d) long roots

24. Feebly developed and soft stem with a large number of air spaces is a characteristic of

(a) lithophytes

(b) halophytes

(c) hydrophytes

(d) xerophytes

Answer: (b) halophytes

25. Presence of mucilage is characteristic of

(a) water storage tissue

(b) insectivorous plants

(c) aerenchyma

(d) mesophytes

Answer: (a) water storage tissue

26. Sunken stomata and multiple epidermal cells found in the leaves of

(a) Zea mays

(b) Nerium

(c) Nelumbium

(d) Acacia

Answer: (c) Nelumbium

27. Sun loving plants are known as

(a) heliophytes

(b) sciophytes

(c) halophytes

(d) xerophytes

Answer: (a) heliophytes

28. Submerged rooted plant amongst the following is

(a) Hydrilla

(b) Vallisneria

(c) Pistia

(d) None

Answer: (b) Vallisneria

29. Halophytes are able to grow in concentrated salt solution because they

(a) accumulate high concentration of KCL

(b) have branched hydrocarbon chains in the phospholipids of cell membranes

(c) possess pigment bacteriorhodopsin

(d) can absorb water against concentration gradient

Answer: (a) accumulate high concentration of KCL

30. Excessive aerenchyma is characteristic of

(a) hydrophytes

(b) xerophytes

(c) mesophytes

(d) heliophytes

Answer: (b) xerophytes

31. In submerged plants, the stomata lie on

(a) upper surface

(b) both surfaces

(c) lower surface

(d) none of these

Answer: (a) upper surface

32. The stem of submerged hydrophytes is soft and weak. This is due to

(a) absence of xylem

(b) absence of stomata

(c) absence of phloem

(d) reduced mechanical tissue and xylem

Answer: (a) absence of xylem

33. Stomata in floating plants are located on

(a) both surfaces of leaf

(b) lower surface of leaves

(c) upper surface of leaves

(d) are absent

Answer: (d) are absent

34. An American plant which has become troublesome waterweed in India is

(a). Typha latifolia

(b). Trapa bispinosa

(c). Cyperus rotundus

(d). Eichhornia crassipes

Answer: (d). Eichhornia crassipes

35. Submerged rooted plant amongst the following is

(a) Hydrilla

(b) Vallisneria

(c) Pistia

(d) None

Answer: (d) None

36. Submerged hydrophytes have well developed

(a) vascular system

(b) aerenchyma

(c) root system

(d) stoma

Answer: (b) aerenchyma

37. Osmotic pressure is maximum in

(a) hydrophytes

(b) halophytes

(c) xerophytes

(d) mesophytes

Answer: (a) hydrophytes

38. Waxy coating on the surface of floating leaves prevents

(a) respiration

(b) photosynthesis

(c) clogging of stomata

(d) transpiration

Answer: (c) clogging of stomata

39. Avicennia, Rhizophora, Atriplex are

(a) xerophytes

(b) halophytes

(c) hydrophytes

(d) mesophytes

Answer: (b) halophytes

40. Praying Mantis is a good example of

(a) camouflage

(b) warning colouration

(c) mullerian mimicry

(d) social insect

Answer: (a) camouflage

41. Characteristics features of netritic zone of sea are

(a) velamen

(b) lenticels

(c) pneumatophore

(d) hydathode

Answer: (c) pneumatophore

42. Pneumatophores occur in

(a) halophytes/mangroves

(b) xerophytes

(c) mesophytes

(d) hydrophytes

Answer: (a) halophytes/mangroves

43. Which of the following is a xerophytic plant in which the stem is modified into a flat green and succulent structure?

(a) Casuarinas

(b) Opuntia

(c) Hydrilla

(d) Acacia

Answer: (b) Opuntia

44. Plants that grow in sandy soil are known as

(a) heliophytes

(b) psammophytes

(c) sciophytes

(d) mesophytes

Answer: (b) psammophytes

45. Free floating hydrophytes amongst the following is

(a) Lemna

(b) Opuntia

(c) Trapa

(d) Hydrilla

Answer: (a) Lemna

46. Calotropis is a

(a) ephemeral annual

(b) succulent

(c) drought resistant

(d) halophyte

Answer: (c) drought resistant

47. Name the plant that has bulbous petiole

(a) Eichhornia

(b) Hydrilla

(c) Marsilea

(d) Pistia

Answer: (a) Eichhornia

48. Heterophylly shown by

(a) Ranunculus

(b) Limnophila

(c) Sagittaria

(d) All the above

Answer: (d) All the above

49. Example of ephemeral annual is

(a) Argemone mexicana

(b) Cassia

(c) Opuntia

(d) All the above

Answer: (d) All the above

50. Cistoliths are present in

(a) Ficus

(b) Casuarina

(c) Calotropis

(d) None

Answer: (a) Ficus