MCQOPTIONS
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MCQOPTIONS
This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Most hazardous metal pollutant of automobile exhausts is |
| A. | mercury |
| B. | cadmium |
| C. | lead |
| D. | copper |
| Answer» D. copper | |
| 2. |
Food chain in which microorganisms breakdown the food formed by primary producersis |
| A. | parasitic food chain |
| B. | detritus food chain |
| C. | consumer food chain |
| D. | predator food chain |
| Answer» C. consumer food chain | |
| 3. |
Which one is true? |
| A. | commensalism when none of the interacting populations affect each other |
| B. | symbiosis when the interaction is useful to both the populations |
| C. | symbiosis when neither populations affects each other |
| D. | commensalism when the interaction is useful to both the populations |
| Answer» C. symbiosis when neither populations affects each other | |
| 4. |
Deep black soil is productive due to high proportion of |
| A. | sand and zinc |
| B. | gravel and calcium |
| C. | clay and humus |
| D. | silt and earthworm |
| Answer» D. silt and earthworm | |
| 5. |
Domestic waste constitutes |
| A. | nonbiodegradable pollution |
| B. | biodegradable pollution |
| C. | effluents |
| D. | air pollution |
| Answer» B. biodegradable pollution | |
| 6. |
Pyramid of numbers in a grassland/tree ecosystem |
| A. | always inverted |
| B. | always upright |
| C. | both (a) and (b) |
| D. | spindle-shaped. |
| Answer» C. both (a) and (b) | |
| 7. |
Deforestation will decrease |
| A. | soil erosion |
| B. | soil fertility |
| C. | land slides |
| D. | rainfall. |
| Answer» E. | |
| 8. |
Major aerosol pollutant in jet plane emission is |
| A. | sulphur dioxide |
| B. | carbon monoxide |
| C. | methane |
| D. | fluorocarbon |
| Answer» E. | |
| 9. |
The relation between algae and fungi in lichen is |
| A. | symbiosis |
| B. | parasitism |
| C. | commenalism |
| D. | protocooperation |
| Answer» B. parasitism | |
| 10. |
Soil conservation is |
| A. | conversion of sterile soil into fertile one |
| B. | aeration of soil |
| C. | erosion of soil |
| D. | protection against loss. |
| Answer» E. | |
| 11. |
Green house effect is warming due to |
| A. | infra-red rays reaching earth |
| B. | moisture layer in atmosphere |
| C. | increase in temperature due to increase in carbon dioxide concentration of atmosphere |
| D. | ozone layer of atmosphere |
| Answer» D. ozone layer of atmosphere | |
| 12. |
in an ecosystem, which one shows one-way passage |
| A. | free energy |
| B. | carbon |
| C. | nitrogen |
| D. | potassium |
| Answer» B. carbon | |
| 13. |
What is true of ecosystem? |
| A. | primary consumers are least dependent upon producers |
| B. | primary consumers out-number producers |
| C. | producers are more than primary consumers |
| D. | secondary consumers are the largest and most powerful |
| Answer» D. secondary consumers are the largest and most powerful | |
| 14. |
Which organisms externally digest dead organic matter and then absorb the nutrients? |
| A. | saprotrophs |
| B. | autotrophs |
| C. | heterotrophs |
| D. | detritivores |
| Answer» B. autotrophs | |
| 15. |
What term refers to a community and its abiotic environment? |
| A. | biosphere |
| B. | ecosystem |
| C. | habitat |
| D. | niche |
| Answer» C. habitat | |
| 16. |
Which process has the GREATEST effect in determining which members of a population are most likely to survive until reproductive age? |
| A. | natural selection |
| B. | evolution |
| C. | hybridization |
| D. | meiosis |
| Answer» B. evolution | |
| 17. |
According to Darwin's theory of evolution, what causes the struggle for survival in populations? |
| A. | Overproduction of offspring |
| B. | Natural selection |
| C. | Favorable heritable variations |
| D. | Competition between the fittest individuals in the population |
| Answer» B. Natural selection | |
| 18. |
Why has evolution resulted in antibiotic resistance in bacteria? |
| A. | Bacteria have learnt how to neutralize effects of antibiotics and pass that onto their offsprings |
| B. | Bacteria change their metabolism to cope with the presence of antibiotics. |
| C. | Bacteria resistant to the antibiotic survive to pass on this characteristic to their offspring. |
| D. | Not completing a course of antibiotics allows resistant bacteria to develop. |
| Answer» D. Not completing a course of antibiotics allows resistant bacteria to develop. | |
| 19. |
What is natural selection? |
| A. | The mechanism that leads to increasing variation within a population. |
| B. | The cumulative change in the heritable characteristics of a population. |
| C. | The mechanism that increases the chance of certain individuals reproducing. |
| D. | The mechanism that explains why populations produce more offspring than the environment can support. |
| Answer» D. The mechanism that explains why populations produce more offspring than the environment can support. | |
| 20. |
Classification in biology involves putting organisms that share characteristics together in groups. In which type of group do the organisms share the MOST characteristics? |
| A. | Genus |
| B. | Class |
| C. | Family |
| D. | Order |
| Answer» B. Class | |
| 21. |
The scientific names of two organisms are "Lathyrus palustris" and "Angelica palustris". What is the relationship between these organisms? |
| A. | They are both different species and different genera |
| B. | They both belong to the same genus but they are different species |
| C. | They both belong to the same species but different genera |
| D. | They both belong to the same species and the same genus |
| Answer» B. They both belong to the same genus but they are different species | |
| 22. |
What statement can be made about members of the same order? |
| A. | They can all interbreed successfully. |
| B. | They all belong to the same family |
| C. | They all belong to the same genus |
| D. | They all belong to the same class |
| Answer» E. | |
| 23. |
All are the characteristics of reptilia except |
| A. | Amniotic eggs. |
| B. | Cutaneous respiration |
| C. | Dry skin. |
| D. | Scales. |
| Answer» C. Dry skin. | |
| 24. |
Sponges posses flagellum in |
| A. | Amoebocytes. |
| B. | Choanocytes. |
| C. | Epithelial cells. |
| D. | All of the above. |
| Answer» C. Epithelial cells. | |
| 25. |
In Platyhelminthes, the main function of the flame cell is |
| A. | Reproduction |
| B. | Excretion. |
| C. | Osmoregulation. |
| D. | None of the above. |
| Answer» C. Osmoregulation. | |
| 26. |
The photoreceptor which is common in the regulation of biological clock in plants, molds, and flies |
| A. | Cryptochrome. |
| B. | Phytochrome. |
| C. | carotenoid. |
| D. | All of the above. |
| Answer» B. Phytochrome. | |
| 27. |
Which of the following mating system is common in mammals |
| A. | Polygamy. |
| B. | Polyandry. |
| C. | Polygyny. |
| D. | Monogamy. |
| Answer» D. Monogamy. | |
| 28. |
Which of the following gymnosperm have similar vascular tissue system |
| A. | Conifers. |
| B. | Gnetophytes. |
| C. | Cycads. |
| D. | None of the above. |
| Answer» C. Cycads. | |
| 29. |
The first events in the evolution of eukaryotic |
| A. | Chloroplast and endosymbiosis evolution. |
| B. | Mitochondria and endosymbiosis |
| C. | Compartmentalisation and nucleus formation. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 30. |
In which of the following taxonomic group contain species that have similar characteristics as a result of convergent evolution? |
| A. | Polyphyletic |
| B. | Monophyletic |
| C. | Cladistic |
| D. | None of the above. |
| Answer» B. Monophyletic | |
| 31. |
Which of the following do not contribute to the genomic diversity among various species |
| A. | Gene duplication. |
| B. | Lateral gene transfer. |
| C. | Gene transcription. |
| D. | Chromosomal mutation. |
| Answer» D. Chromosomal mutation. | |
| 32. |
Which of the following is not the character of arthropods |
| A. | Closed circulatory system. |
| B. | Jointed appendages. |
| C. | Segmented ganglia. |
| D. | External segmentation. |
| Answer» B. Jointed appendages. | |
| 33. |
Which of the following phylum is closely related to the Phylum Chordata? |
| A. | Echinodermata. |
| B. | Mollusca. |
| C. | Platyhelminthes. |
| D. | All of the above. |
| Answer» B. Mollusca. | |
| 34. |
Which of the following is used to define the behavior that occurs as a result of experience? |
| A. | Imprinting. |
| B. | Habituation. |
| C. | Misperception. |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 35. |
High parental care in animal is associated with the |
| A. | Iteroparity. |
| B. | Large number of offspring. |
| C. | Semelparity. |
| D. | Large size of offspring. |
| Answer» B. Large number of offspring. | |
| 36. |
When unrelated group of organism develops similar adaptive phenotype called adaptive convergence. This leads to the |
| A. | Change in gene frequency. |
| B. | Territoriality. |
| C. | Parallel evolution |
| D. | Formation of homologous structure |
| Answer» D. Formation of homologous structure | |
| 37. |
DNA sequence analysis suggests that the eukaryotic mitochondrial DNA originated from the |
| A. | Algae. |
| B. | Fungi. |
| C. | Protista. |
| D. | Bacteria. |
| Answer» E. | |
| 38. |
Which of the following is called the age of reptilian |
| A. | Permian period. |
| B. | Cenozoic era. |
| C. | Mesozoic era. |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 39. |
Two species live in the same geographical area but reproduce at the different time is known as |
| A. | Reproductive isolation. |
| B. | Mechanical isolation. |
| C. | Temporal isolation. |
| D. | Behavioral isolation. |
| Answer» D. Behavioral isolation. | |
| 40. |
eathers of birds is a modified form of reptilian scale.This modification of reptilian scale to feathers of birds is the example of |
| A. | Allometric growth |
| B. | Preadaptation |
| C. | Hybrid breakdown |
| D. | Paedomorphogenesis |
| Answer» C. Hybrid breakdown | |
| 41. |
Brassica juncea can be used as the phytoremediation agent for the removal of ___________ from the soil. |
| A. | Nickel |
| B. | Cadmium |
| C. | Lead |
| D. | Arsenic |
| Answer» D. Arsenic | |
| 42. |
Which of the following is a micronutrient in plants? |
| A. | Ca |
| B. | Mg |
| C. | Mn |
| D. | S |
| Answer» D. S | |
| 43. |
In an ecological interaction, the commensalism can be represented as: |
| A. | + – |
| B. | – + |
| C. | + 0 |
| D. | – 0 |
| Answer» D. – 0 | |
| 44. |
Which of the following is an example for link species? |
| A. | Clownfish |
| B. | Cuscuta |
| C. | Mycorrhiza |
| D. | Lichen |
| Answer» D. Lichen | |
| 45. |
A species in Tropical Rainforest which acts as a Key-stone species: |
| A. | Dalbergia |
| B. | Ficus |
| C. | Santalum |
| D. | Nepenthes |
| Answer» C. Santalum | |
| 46. |
Two biodiversity hot-spots in India are |
| A. | Eastern Himalayas and Western Ghats |
| B. | Western Himalayas and Western Ghats |
| C. | Eastern Himalayas and Eastern Ghats |
| D. | Western Himalayas and Eastern Ghats |
| Answer» B. Western Himalayas and Western Ghats | |
| 47. |
The ratio between regional and local species diversity is measured as: |
| A. | Alpha diversity |
| B. | Beta diversity |
| C. | Gamma diversity |
| D. | Delta diversity |
| Answer» C. Gamma diversity | |
| 48. |
Methemoglobinemia is caused by the drinking of water contaminated with: |
| A. | Phosphate |
| B. | Mercury |
| C. | Cadmium |
| D. | Nitrate |
| Answer» E. | |
| 49. |
Pneumatophores are characteristic of: |
| A. | Alpine plants |
| B. | Mangrove plants |
| C. | Desert plants |
| D. | Aquatic plants |
| Answer» C. Desert plants | |
| 50. |
Which of the following is NOT an adaptation of xerophytic plants? |
| A. | The presence of palisade like tissue in stem |
| B. | The presence of thick cuticle |
| C. | CAM cycle for photosynthesis |
| D. | Large leaves if present |
| Answer» E. | |