Competitive Exams: Zoology MCQs (Practice_Test 27 of 112)
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- In which ecosystem is the. Detritus pathway most important in energy movement through trophic levels?
- Rain forests
- Lakes
- Grasslands
- Oceans
- Removal of the keystone predator from a community will result in
- dominance of an alternate predator
- general decline in species diversity
- increase in prey population densities
- decrease in primary productivity
- One of the major adaptive features of the desert animals is
- production of metabolic water
- conservation of metabolic water
- reduced metabolic activity
- reduced excretion
- In India, the lion-tailed Macque is found only in
- Bandipur Biosphere. Reserve
- Eastern Ghats
- Guindy National Park
- Western Ghats
- The acceptable concept of ecological niche is that it represents the
- trophic status of a species in a community
- unique microhabitat of a species
- sum total of a species use of biotic and abiotic resources of the environment
- unique combination of the trophic status and the microhabitat of a species
- Consider the following statements in the context of ecosystem
- Radiant energy reaching the surface of earth on a dear day Is about 2 % ultraviolet, 74 % visible light and the rest is infrared.
- Visible radiation is least attenuated during its passage through dense cloud cover and water.
- Thermal radiation is absorbed by biomass to a greater degree than is solar radiation.
Which of these statements are correct?
- 1 and 2
- 2 and 3
- 1 and 3
- 1,2 and 3
- Hypophysectomized frog can be induced to ovulate by injecting
- FSH
- LH
- FSL and LH
- Estrogen and LH
- The mammalian sperms achieve fertilizing capacity in the
- seminiferous tubules
- epididymis
- vas deferens
- female genital tract
- Bidder՚s organ is
- a neurosecretory component of brain in some amphibians
- a part of the reproductive system in some amphibians
- a scent producing agent for attracting the opposite sex
- an endocrine organ
- Three pairs of external gills of early larve of a frog are formed from the visceral arches numbering
- 1,2 and 3
- 4,5 and 6
- 3,2 and 4
- 3,4 and 5
- Consider the following statements Placenta present in mammals acts as an endocrine tissue and produces
- human chorionic gonadotrophin
- estrogen
- progesterone
- testosterone
Which of these statements are correct?
- 1 and 4
- 1 and 2
- 1,2 and 3
- 2,3 and 4
- Retrogressive metamorphosis occurs in
- frog, Herdmania
- frog, Necturus
- Botryllus, Necturus
- Botryllus, Herdmania
- In frog, the internal ear develops from
- ectoderm
- endoderm
- mesoderm
- chordamesoderm
- The process of gastrulation in amphibian embryos starts from the dorsal lip of blastopore by
- epiboly
- evagination
- involution
- delamination
- Mitotic chromosomes are transcriptionally inactive, because
- ribonucieoside triphosphates are sparingly available as they walk over to cytoplasm in the absence of a nuclear membrane
- energy needed for transcription is diverted towards spindle-apparatus formation
- RNA polymerase, specially its s-factor, gets denatured after getting combined with spindle-forming molecules
- Condensed form of chromatin prevents
RNA polymerase from gaining access to DNA