MCQOPTIONS
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MCQOPTIONS
This section includes 470 Mcqs, each offering curated multiple-choice questions to sharpen your 10th knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The two oviducts in a human female unite into an elastic bag like is known as |
| A. | Vagina |
| B. | Uterus |
| C. | Fallopian tube |
| D. | Cervix |
| Answer» C. Fallopian tube | |
| 402. |
In order to determine focal length of a concave mirror by obtaining the image of distant objecton screen you need to measure the distance between |
| A. | mirror and the screen |
| B. | object & screen |
| C. | mirror & objec |
| D. | mirror & screen also between objectand screen |
| Answer» B. object & screen | |
| 403. |
An object is placed at a distance of 20cm in front of concave mirror of focal length 10cm. Theimage produced is |
| A. | real, inverted & diminished |
| B. | real, inverted & enlarged |
| C. | real inverted & same size |
| D. | virtual, erect and enlarged |
| Answer» D. virtual, erect and enlarged | |
| 404. |
To determine the focal length of a concave mirror by forming image of a distant object, thescreen should be placed |
| A. | in any direction |
| B. | inclined at an angle of 45 |
| C. | at right angle to the plane of the mirror |
| D. | Parallel to the plane of mirror |
| Answer» E. | |
| 405. |
The image formed by a concave mirror is virtual and erect & on the same side of the object.The position of the object is |
| A. | at center of curvature |
| B. | at the principle focus |
| C. | between F and C |
| D. | between P & |
| Answer» E. | |
| 406. |
A spherical mirror to be made from a cut portion of |
| A. | hollow sphere of glass |
| B. | solid sphere of plastic |
| C. | solid sphere of glas |
| D. | hollow sphere of meta |
| Answer» B. solid sphere of plastic | |
| 407. |
Parasympathetic system and sympathetic system are two systems of |
| A. | central nervous system |
| B. | reflexive nervous system |
| C. | autonomic nervous system |
| D. | ventral nervous system |
| Answer» D. ventral nervous system | |
| 408. |
In neuron, cytoplasm and nucleus is located in |
| A. | papillary glands |
| B. | cell body |
| C. | endocrine system |
| D. | nerve impulses |
| Answer» C. endocrine system | |
| 409. |
Considering spinal and cranial nerves, pathway which conducts impulses to effectors from central nervous system is classified as |
| A. | parietal pathways |
| B. | sensory pathways |
| C. | motor pathways |
| D. | temporal pathways |
| Answer» D. temporal pathways | |
| 410. |
Considering lobes of cerebral cortex, lobe which is involved in movement of speech and control skeletal muscles is called |
| A. | occipital lobe |
| B. | temporal lobe |
| C. | parietal lobe |
| D. | frontal lobe |
| Answer» E. | |
| 411. |
In human body, group formed by neurons enclosed in membrane at certain body parts is called |
| A. | benign |
| B. | malign |
| C. | ganglion |
| D. | neuroglial |
| Answer» D. neuroglial | |
| 412. |
Ecosytem is mainly concerned with |
| A. | energy flow and nutrient recycling |
| B. | population |
| C. | community |
| D. | species |
| Answer» C. community | |
| 413. |
Life Sciences |
| A. | All populations experience exponential growth once they reach carrying capacity |
| B. | A population of organisms always grows rapidly once it reaches carrying capacity |
| C. | Limiting factors can influence the number of organisms in a population once it reaches carrying capacity |
| D. | The number of organisms decreases but never increases once it reaches carrying capacity |
| Answer» E. | |
| 414. |
_________ is a density-dependent factor. |
| A. | Competition |
| B. | Temperature |
| C. | Drought |
| D. | Floods |
| Answer» E. | |
| 415. |
Based on the data in the graph, which of these statements is true? |
| A. | Growth of the housefly population begins to increase rapidly about 3/4 of the way through the first year |
| B. | At the beginning of the year, there are no houseflies in the population |
| C. | The population size shows a straight-line increase |
| D. | All of the population will be dead at the end of one year |
| Answer» D. All of the population will be dead at the end of one year | |
| 416. |
Which of these is NOT a characteristic of a rapid life-history organism? |
| A. | rapid period of time until maturation |
| B. | small body size |
| C. | early reproduction age |
| D. | long life span |
| Answer» D. long life span | |
| 417. |
Why have top predators (consumers at the top of the food chain), such as the cheetah and the tiger, always had smaller populations than organisms lower in the food chain? |
| A. | Hunted by humans |
| B. | Low birth rate |
| C. | Limited energy availability |
| D. | None of the above |
| Answer» E. | |
| 418. |
Which process is most capable of slowing global warming? |
| A. | Decomposition |
| B. | Respiration |
| C. | Photosynthesis |
| D. | Chemosynthesis |
| Answer» E. | |
| 419. |
What is the single most important factor contributing to losing or creating endangered species? |
| A. | air pollution |
| B. | clearcut logging |
| C. | habitat loss |
| D. | water pollution |
| Answer» D. water pollution | |
| 420. |
Predators can influence the structure of a community because their removal from the community causes a catastrophic change in the composition and structure of the rest of the community. What are the predators called because of this? |
| A. | Keystone species |
| B. | Oppourtunists |
| C. | Coevolutionists |
| D. | Edge species |
| Answer» E. | |
| 421. |
A population’s role in the community or the resources it uses is called its _____? |
| A. | Trophic structure |
| B. | Niche |
| C. | Community interaction |
| D. | HabitatPractice Test Paper – Environmental Biology 367 |
| Answer» E. | |
| 422. |
This type of biome (habitat) has very long cold winters, short warm summers and typically has acidic soils as a result of the cold temperatures and litter fall. |
| A. | Desert |
| B. | Tundra |
| C. | Taiga (Coniferous forests) |
| D. | Temperate forests |
| Answer» E. | |
| 423. |
What has been the approximate rise in sea level over the past century? |
| A. | 14-16 inches (35-40 cm) |
| B. | 10-12 inches (25-30 cm) |
| C. | 2-4 inches (5-10 cm) |
| D. | 6-8 inches (15-20 cm) |
| Answer» B. 10-12 inches (25-30 cm) | |
| 424. |
Which of these is a large reservoir of nitrogen that is unusable by most organisms? |
| A. | soil |
| B. | ocean |
| C. | atmosphere |
| D. | space |
| Answer» C. atmosphere | |
| 425. |
Predator populations and types of decomposers are biotic environmental factors. Which is an abiotic environmental factor? |
| A. | common flora |
| B. | availability of prey |
| C. | presence of microbes |
| D. | average precipitation |
| Answer» D. average precipitation | |
| 426. |
The greatest amount of food per acre is produced in the . |
| A. | tundra |
| B. | grassland |
| C. | marine biome |
| D. | rain forest |
| Answer» C. marine biome | |
| 427. |
Each organism occupies a particular trophic level in a food chain. Moving from one trophic level to the nex involves an energy loss of about |
| A. | 10% |
| B. | 30% |
| C. | 50% |
| D. | 70% |
| Answer» B. 30% | |
| 428. |
At present, the relationship between human and monkey can be stated as |
| A. | They both have common ancestors |
| B. | Human have evolved from monkey |
| C. | Both have very distinct phylogeny |
| D. | Relationship can not be established |
| Answer» E. | |
| 429. |
For climax which statement is INCORRECT? |
| A. | Number of perennial species increases |
| B. | Dependency on detritious food chain increases |
| C. | Vertical stratification of community increases |
| D. | Exploitation competition is more then normal competition366 CSIR-NET Life Sciences |
| Answer» E. | |
| 430. |
In an pond ecosystem, net productivity by zooplankton is ‘p’ and biomass consumed by small fishes is 'c', then the ratio of c/p is termed as- |
| A. | Assimilation efficiency |
| B. | Net secondary productivity |
| C. | Consumption efficiency |
| D. | Conversion efficiency |
| Answer» D. Conversion efficiency | |
| 431. |
The birds in tropics are generally smaller in size because of- |
| A. | To increase surface area to volume ratio |
| B. | To decrease surface area to volume ratio |
| C. | For easy flight |
| D. | Aestivation |
| Answer» E. | |
| 432. |
Which is correct relationship between habitat disturbance and biodiversity- |
| A. | Areas with no habitat disturbance tends to have high biodiversity |
| B. | Areas with high habitat disturbance tends to have high biodiversity |
| C. | Areas with moderate habitat disturbance tends to have high biodiversity |
| D. | Areas with no habitat disturbance tends to have low biodiversity |
| Answer» D. Areas with no habitat disturbance tends to have low biodiversity | |
| 433. |
When a marine fish is placed in fresh water, it dies becuase- |
| A. | Entry of water and it floats |
| B. | Exit of water and shrinks |
| C. | Deficiency of salts |
| D. | Deficiency of nutrients |
| Answer» E. | |
| 434. |
Rapid nutritional recycling takes place in- |
| A. | Coral |
| B. | Deserts |
| C. | Grasslands |
| D. | Oceans |
| Answer» C. Grasslands | |
| 435. |
Maximum biodiversity occurs at- |
| A. | Tropics |
| B. | Equator |
| C. | Temperate |
| D. | Shooth |
| Answer» D. Shooth | |
| 436. |
Deepest enriched soil with nutrients is present at- |
| A. | Tropical rain forests |
| B. | Dry deciduous forests |
| C. | Grasslands |
| D. | Conifers |
| Answer» E. | |
| 437. |
Soil in naturally growing vegetation is- |
| A. | Acidic due to Bicarbonate in soil |
| B. | Basic due to Bicarbonate in soil |
| C. | Neutral |
| D. | Acidic due to Sulphuric acid |
| Answer» B. Basic due to Bicarbonate in soil | |
| 438. |
Major source of green house gases are- |
| A. | Burning of plants |
| B. | Burning of fossil fuels |
| C. | Respiration |
| D. | Use of LPG |
| Answer» E. | |
| 439. |
Number of individual surviving to reproductive stage is termed as- |
| A. | Fecundity |
| B. | Net reproduction rate |
| C. | Survivorship curve |
| D. | Reproductive Mortality |
| Answer» C. Survivorship curve | |
| 440. |
Net productivity of closed ecosystem is- |
| A. | 0 |
| B. | <0 |
| C. | >0 |
| D. | +1/–1 |
| Answer» D. +1/–1 | |
| 441. |
Profitability of prey for predator lies in its energy content and |
| A. | Prey density |
| B. | Palatability |
| C. | Foraging time |
| D. | prey availability |
| Answer» C. Foraging time | |
| 442. |
The gradual mode of speciation in single lineage in which species diverge in spurts of relatively rapid change which result in increase in species is termed as- |
| A. | Punctuated equilibrium |
| B. | Adaptive radiation |
| C. | Anagenesis |
| D. | Cladogenesis |
| Answer» C. Anagenesis | |
| 443. |
Drosophila shares more its genes with sister (75%) as compare to its daughter (50%) due to- |
| A. | Eusocialbilty |
| B. | Kin selection |
| C. | Haploidy diploidy |
| D. | Parthenogensis |
| Answer» B. Kin selection | |
| 444. |
Total energy available for work at equilibrium is termed as- |
| A. | Free energy |
| B. | Entropy |
| C. | Activation energy |
| D. | Enthalpy |
| Answer» E. | |
| 445. |
In India most of plant flowers during spring or summer because- |
| A. | It is breeding season for butterflies |
| B. | More solar radiation are available |
| C. | Fruit and seed setting must be complete before onset of monsoon |
| D. | Environmental fluctuations are low |
| Answer» E. | |
| 446. |
Among the following which is not an characteristic of r-Selected species- |
| A. | Short maturation time |
| B. | Short life span |
| C. | Small size of offspring’s |
| D. | More then one time offspring producti |
| Answer» B. Short life span | |
| 447. |
Benthic organism of lakes or sea are usually- |
| A. | Producer |
| B. | Herbivores |
| C. | Carnivores |
| D. | Decomposers364 CSIR-NET Life Sciences |
| Answer» C. Carnivores | |
| 448. |
Biological magnification is maximum in human it proves that human is- |
| A. | Top consumer in food chain |
| B. | More susceptible |
| C. | Major Pollutant |
| D. | Most efficient in storage of reserve food |
| Answer» B. More susceptible | |
| 449. |
Exotic weed which proved very harmful for forest and grassland is- |
| A. | Eupatromia |
| B. | Verbenia |
| C. | Eichornia |
| D. | Salvia |
| Answer» E. | |
| 450. |
A non harmful species copies a harmful and tasteless form, the type of mimicry shown is- |
| A. | Bateson |
| B. | Mullerian |
| C. | Darwinian |
| D. | Morganarian |
| Answer» C. Darwinian | |