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51.

Consider the following statements A. Stomata are completely absent in hydrophytes. B. In hydrophytes, vasuclar bundles always have bundle sheaths. C. Proline helps in maintaing osmotic and water potentila in xerophytes. Which of the statements given above is/are correct ?A. A onlyB. B onlyC. Both A and CD. C only

Answer» Correct Answer - D
52.

Near sea store many plants show reduced gorwth due toA. excessive grazingB. high speed windC. desiccationD. salt spray

Answer» Correct Answer - D
53.

The plants growing in deserts to tolerate water stress, haveA. no stomataB. pneumatophoresC. stem modified into leaf-like formD.

Answer» Correct Answer - D
54.

Plants growing in nutrient poor soils that are not very condusive to microflora often becomeA. insectivaorousB. saprotrophicC. chemotrophicD. xerophytes

Answer» Correct Answer - A
55.

Plants growing on rocks are called asA. psychromphytesB. lithophytesC. halophytesD. sciophytes

Answer» Correct Answer - B
56.

Which of the following adaptations is likely to be observed in arid condition ? (i) vertically hanging leaves (ii) presence of salt glands (iii) green fleshy stem (iv) absence of vascular tissue, scarcely developed vascular tissue.A. (i) and (ii)B. (ii) and (iv)C. (i) and (iii)D. (ii) and (iii)

Answer» Correct Answer - C
57.

Submerged hydrophytes have dissected leaves forA. decreasing surface areaB. increasing surface areaC. reducing effect of water currentsD. increasing number of stomata

Answer» Correct Answer - C
58.

July 11 is observed asA. world population dayB. not tobacco dayC. world environmental dayD. world health day

Answer» Correct Answer - A
59.

Plants growing near sea shore will usually have xerophyic characters, like thick leaves becauseA. There is plenty of water in the soilB. The concentration of salts is too high for the plants to absorb sufficient water from the soilC. Light available to the plants is not sufficient.D. The soil is muddy

Answer» Correct Answer - B
60.

The leaves of a tundra plant resmemble the leaves of a plant in aA. Tropical rainforestB. Temperate deciduous forestC. Northern coniferous forestD. Desert

Answer» Correct Answer - D
61.

Which of the following is not true ?A. population tends to grow in geometrical progressionB. J-shaped growth curve has only two phasesC. There are more females than males in IndiaD. Father is biologically respeonsible for the sex of the child.

Answer» Correct Answer - C
62.

Individuals of one kind (species) occupying a particular geographic area at a given time formA. communityB. populationC. speciesD. biome

Answer» Correct Answer - B
63.

A triangular age pyramid hasA. declining populationB. increasing populationC. stable populationD. fluctuating population

Answer» Correct Answer - B
64.

In India, human population has higher number of younger age group due toA. long life span and low birth rateB. short life span and high birth rateC. short life span and low birth rateD. birth rate is equaol to death rate

Answer» Correct Answer - B
Orchids growing on tress is an example of epiphytism (commensalism) . Cuscuta is a taotla stem parasite . Algae and fungi in lichens is an example of mutualism.
65.

The instrument used to meausre wird velocity isA. HydrometerB. AnemometerC. PhotometerD. Potometer

Answer» Correct Answer - B