CSIR NET JRF: Zoology MCQs (Practice-Test 27 of 112)

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  1. In which ecosystem is the. Detritus pathway most important in energy movement through trophic levels?

    1. Rain forests

    2. Lakes

    3. Grasslands

    4. Oceans

  2. Removal of the keystone predator from a community will result in

    1. dominance of an alternate predator

    2. general decline in species diversity

    3. increase in prey population densities

    4. decrease in primary productivity

  3. One of the major adaptive features of the desert animals is

    1. production of metabolic water

    2. conservation of metabolic water

    3. reduced metabolic activity

    4. reduced excretion

  4. In India, the lion-tailed Macque is found only in

    1. Bandipur Biosphere. Reserve

    2. Eastern Ghats

    3. Guindy National Park

    4. Western Ghats

  5. The acceptable concept of ecological niche is that it represents the

    1. trophic status of a species in a community

    2. unique microhabitat of a species

    3. sum total of a species use of biotic and abiotic resources of the environment

    4. unique combination of the trophic status and the microhabitat of a species

  6. Consider the following statements in the context of ecosystem

    1. Radiant energy reaching the surface of earth on a dear day Is about 2% ultraviolet, 74% visible light and the rest is infrared.

    2. Visible radiation is least attenuated during its passage through dense cloud cover and water.

    3. Thermal radiation is absorbed by biomass to a greater degree than is solar radiation.

    Which of these statements are correct?

    1. 1 and 2

    2. 2 and 3

    3. 1 and 3

    4. 1, 2 and 3

  7. Hypophysectomized frog can be induced to ovulate by injecting

    1. FSH

    2. LH

    3. FSL and LH

    4. Estrogen and LH

  8. The mammalian sperms achieve fertilizing capacity in the

    1. seminiferous tubules

    2. epididymis

    3. vas deferens

    4. female genital tract

  9. Bidder's organ is

    1. a neurosecretory component of brain in some amphibians

    2. a part of the reproductive system in some amphibians

    3. a scent producing agent for attracting the opposite sex

    4. an endocrine organ

  10. Three pairs of external gills of early larve of a frog are formed from the visceral arches numbering

    1. 1, 2 and 3

    2. 4, 5 and 6

    3. 3, 2 and 4

    4. 3, 4 and 5

  11. Consider the following statements Placenta present in mammals acts as an endocrine tissue and produces

    1. human chorionic gonadotrophin

    2. estrogen

    3. progesterone

    4. testosterone

    Which of these statements are correct?

    1. 1 and 4

    2. 1 and 2

    3. 1, 2 and 3

    4. 2, 3 and 4

  12. Retrogressive metamorphosis occurs in

    1. frog, Herdmania

    2. frog, Necturus

    3. Botryllus, Necturus

    4. Botryllus, Herdmania

  13. In frog, the internal ear develops from

    1. ectoderm

    2. endoderm

    3. mesoderm

    4. chordamesoderm

  14. The process of gastrulation in amphibian embryos starts from the dorsal lip of blastopore by

    1. epiboly

    2. evagination

    3. involution

    4. delamination

  15. Mitotic chromosomes are transcriptionally inactive, because

    1. ribonucieoside triphosphates are sparingly available as they walk over to cytoplasm in the absence of a nuclear membrane

    2. energy needed for transcription is diverted towards spindle-apparatus formation

    3. RNA polymerase, specially its s-factor, gets denatured after getting combined with spindle-forming molecules

    4. Condensed form of chromatin prevents

RNA polymerase from gaining access to DNA

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