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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
Which one of the following is not a parasitic adaptation?A. Development of adhesive organsB. Loss of digestive organsC. Loss of reproductive capacityD. Loss of unncessary sense organs. |
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Answer» Correct Answer - C In accordance with their life style parasites evolve special adaptations such as: 1) Loss of unnecessary sense organs. 2) Loss of digestive system. 3) High reproductive capacity. 4) Presence of adhesive organs or suckers to cling on to the host. |
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| 702. |
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association isA. CommensalismB. AmensalismC. EctoparasitismD. Symbiosis |
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Answer» Correct Answer - D A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is symbiosis. |
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| 703. |
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association isA. symbiosisB. commensalismC. ammensalismD. ectoparasitism |
| Answer» Correct Answer - A | |
| 704. |
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association isA. symbiosisB. commensalismC. amensalismD. ectoparasitism |
| Answer» Correct Answer - B | |
| 705. |
Many fresh water animals cannot live for long is sea water and vice versa mainly because ofA. Change in nitrogen levelB. Change in thermal toleranceC. Variation in light intensityD. Osmotic problems |
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Answer» Correct Answer - D Many fresh water animals cannot live for long in sea water and vice versa mainly because of osmotic problems. |
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| 706. |
Give example of each of the following : (a) Batesian mimicry (b) Mullerian mimicry (c) Aggressive mimicry (d) Feigning death mimicry . |
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Answer» (a) Monarch butterfly (model) and Viceroy butterfly (mimetic) . (b) Monarch butterfly (model) and queen butterfly (mimetic ) . (c) Praying mantis . (d) Tenebrinoid beetles . |
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| 707. |
The free-living fungus Tichoderma can be used forA. killing insectsB. biological control of plant diseasesC. controlling butterfly caterpillarsD. producing antibioticss |
| Answer» Correct Answer - A | |
| 708. |
Which of the following shows mimicry ?A. Carausius morosusB. Kalima parolectaC. Mantis religiosaD. All of these |
| Answer» Correct Answer - D | |
| 709. |
Assertion: Leaf butterfly and sick insect show mimicry to dodge their enemies. Reason: Mimicry is a method to acquire body colour blending with the surroundings.A. If both assertion and reason are true and the reason is a correct explanation of the assertion.B. If both assertion and reason are true but reason is not a correct explanation of the assertion.C. If the assertion is true but reason is false.D. If both the assertion and reason are false. |
| Answer» Correct Answer - A | |
| 710. |
Roots play insignificant role in absorption of water inA. PistiaB. PeaC. WheatD. Sunflower |
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Answer» Correct Answer - A Roots play insignificant role in absorption of water in Pistia (a hydrophyte). |
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| 711. |
Comment on the following figure: I, II and III, A, B, C, D, G, P, Q, R, S are species. |
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Answer» Figure I It is a single population and all individuals are of the same species, i.e., a individuals interact among themselves and their environment intraspecific interaction. Figure II It is a community and it contains three populations of species A, B and C. They interact with each other and their environment and is called interspecific interaction. Figure III It is a biome. It contains three communities of which one is in climax and other two are in different stages of development. All three communities are in the same environment and they interact with each other and their environment. |
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| 712. |
An association of individuals of different species living in the same habitat and having functional interactions is :A. Biotic communityB. EcosystemC. PopulationD. Ecological niche |
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Answer» Correct Answer - A An association of individuals of different species living in the same habitat and having functional interactions is biotic community. |
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| 713. |
Comment on the growth curve given below. |
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Answer» The growth curve shown above is logistic growth curve or S-shaped curve. Logistic growth curve is considered more realistic because unlimited resources resources are not available in an ecosystem or in a habitat, where K-stands for carrying capacity. N-indicates population density, which is the number of species of a population per unit area. r-is for intrinsic rate of natural increase. |
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| 714. |
Discuss the various types of positive interactions between species. |
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Answer» The interpecific interaction are of three types positive or benefiicial, negative or antagonistic and last neutral interaction. Some positive interactions are scavenging, commensalism, protocooperation and mutualism. Mutualism This interaction confers benefits on both the interacting species, e.g., (i) Lichens represent an intimate mutualistic relationship between a fungus and photosynthesising algae or cyanobacteria. (ii) The mycorrhizae are associations between fungi and the roots of higher plants. The fungi help the plant in the absorption of essential nutrients from the soil while the plant in turn provides the fungi with energy-yielding carbohydrates. (iii) Plants offer nectar, juicy and nutritious fruits to animals that help pollinate their flowers and disperse their seeds. Commensalism This is the interaction in which one species benefits without affecting the other, e.g., (i) An orchid growing as an epiphyte on a mango branch. (ii) Barnacles growing on the back of a whale. (iii) The cattle egret goraging close to the cattle that stir up and flush out insects from the vegetation. (iv) Sea anemone that has stinging tentacles and the clown fish that lives among them to get protection from predators. Scavenging is the act of feeding by scavenger like bacteria, fungi on the remain of dead animals. Protocooperation in the type of relationship in which both partners mutually obtain benefits. But they associte purely to benefit from each other and can live without each other. |
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| 715. |
Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable example. |
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Answer» A biome can be difine as the large communities of the world and shows that area with similar climate have communities of same type. Climate is the main factor that determine the type of soil which in turn determines the type of vegetation. The type of vegetation and climate together determine the kind of microorganisms and animals. The other determining factors factors are latitude and altitude, intensity and duration of winter and summer days. water mass and topography. The main biome of the world does not show boundary of any country and regional and local variations exist in each biome. e.g., temperate deciduous forest receive an annual precipitation between 75-150 cm and tropical rain forest show a rainfall above 140 cm/yr which may reach upto 400 cm/yr. |
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| 716. |
Give a suitable example for sommensalism. |
| Answer» An interaction between blue whale and the barancle growing on its back is an example of commensalism (interspecific relation) between them. | |
| 717. |
Define ectoparasite and endoparasite and give suitable examples. |
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Answer» Ectoparasite feeds on the external surface of the host organism, e.g., Lice on humans and ticks on dogs. Many marine fish are infested with ectoparasitic copepods. Endoparasites live inside the host body at different sites (liver, kidney,lungs, red blood cells, etc.) . Such as malarial parasites P. vivax, gut parasites, i.e., tapeworm. Their morphological and anatomical features of endoparasites are greatly simplified while emphasising their reproductive potential. |
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| 718. |
Why are coral reefs not found in the regions from West Bengal to Andhra Pradesh but are found in Tamil Nadu and on the east coast of India? |
| Answer» Coral reefs are found in zone with high salt concentration (salinity), optimal temperature and with a less siltation condition which fairly facilitate to colonise corals. In case of high siltation and water flow, coral reef do not colonise. | |
| 719. |
In a pond there are 20 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 28. What is the birth rate?A. 0.28 offspring per lotus per yearB. 0.8 offspring per lotus per yearC. 0.32 offspring per lotus per yearD. 0.4 offspring per lotus per year |
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Answer» Correct Answer - D Rate = `("Change in population")/("Original population")=(28-20)/40` `=8/20 =0.4` offspring epr lotus per year. |
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| 720. |
In a laboratory there are 40 fruitflies last week and during experiment 4 fruitflies died in a week. Calculate the death rate.A. 0.1 individual per fruitfly per yearB. 0.36 individual per fruitfly per weekC. 0.4 individual per fruitfly per weekD. 0.1 individual per fruitfly per week |
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Answer» Correct Answer - D Rate = `("Change in population")/("Original population")=(40-36)/40` `=4/40=0.1` individual per fruitfly per week. |
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| 721. |
If 4 individuals in a laboratory population of 40 fruitflies died during a specified time interval (i.e., a week), the death rate in the population during that period isA. 1B. `0.1`C. `0.01`D. `0.4` |
| Answer» Correct Answer - B | |
| 722. |
The formula for exponential population growth isA. `(dN)/rN=dt`B. `rN/dN=dt`C. `dN/dt=rN`D. `dt/dN=rN` |
| Answer» Correct Answer - C | |
| 723. |
The flower fly resembles a honeybee, but the flower fly has no stings. This is an example ofA. Batesian mimicryB. Mullerian mimicryC. Cryptic colourationD. Interspecific competition |
| Answer» Correct Answer - C | |
| 724. |
The periodic departure and return is known asA. MigrationB. ImmigrationC. EmigrationD. Mutation |
| Answer» Correct Answer - A | |
| 725. |
The age structure of a population is itsA. relative number of individuals at each ageB. number of newborns each yearC. number of young reaching puberty each yearD. relative number of deaths at each age |
| Answer» Correct Answer - A | |
| 726. |
Biggest flower belongs to a plant which isA. Partial root parasiteB. Partial stem parasiteC. Total stem parasiteD. Total root parasite |
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Answer» Correct Answer - D Biggest flower = (Rafflesia) belongs to a plant which is total root parasite. |
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| 727. |
After exponential increase, population becomes stagnant. The growth curve isA. J-ShapedB. S-ShapedC. FluctuatingD. Circular |
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Answer» Correct Answer - B After exponential increases, population becomes stagnant. The grown curve is S-shaped/sigmoid. |
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| 728. |
When an animal group is centered arounda dominant fimale, it is calledA. PatriarchyB. MatriarchyC. SwarmD. Flock |
| Answer» Correct Answer - B | |
| 729. |
A force that acts against maximum population growth isA. Population pressureB. Carrying capacityC. Saturation pointD. Environmental resistance |
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Answer» Correct Answer - D A force that acts against maximum population growth is environmental resistance. |
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| 730. |
When an animal group is centered around a dominant female, it is calledA. patriarchyB. matriarchyC. monarchyD. polyarchy |
| Answer» Correct Answer - B | |
| 731. |
Territory is defended againstA. predatorB. any intruderC. intruder of another speciesD. intruder of same species |
| Answer» Correct Answer - D | |
| 732. |
The growth curve of bacterial population is lab is plotted against time. What will be the shape of graph ?A. SigmoidB. HyperbolicC. Ascending straight lineD. J-shaped |
| Answer» Correct Answer - D | |
| 733. |
Two opposite forces operating in growth and development of every population. One of them has ability to reproduce at a given rate. The opposing force isA. FecundityB. Environmental resistanceC. Biotic controlD. Mortality |
| Answer» Correct Answer - B | |
| 734. |
The increased number and density of species in the region of ecotone is calledA. Edge effectB. Sympatric speciationC. DominanceD. Abundance |
| Answer» Correct Answer - A | |
| 735. |
Select the incorrect statement (w.r.t. Ecological niche)A. It represents functional role and status of a species in the environment .B. It does not represent trophic position of a species.C. No two species can have the same niche if they are found in the same environment.D. It is a component of habitat which is governed by functioning of an organism. |
| Answer» Correct Answer - B | |
| 736. |
Population growth curve is sigmoid, if the growth pattern isA. LogisticB. GeometricC. ExponentialD. Accretionary |
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Answer» Correct Answer - A Population growth is sigmoid, if the growth pattern is logistic. |
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| 737. |
Sigmoid/logistic growth curve is represented byA. dN/dt=rNB. dN/dt=rN(1-N/K)C. Nt=No+B+I-D-ED. dN/dt=1-N/K |
| Answer» Correct Answer - B | |
| 738. |
A boundary between two plant communities of major rank, is calledA. ecotoneB. nicheC. ecotypesD. ecade |
| Answer» Correct Answer - A | |
| 739. |
Ecotone isA. a polluted areaB. the bottom of a lakeC. a zone of transition between two communitiesD. a zone of developing community |
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Answer» Correct Answer - C The adjacent biotic (natural) communities, generally do not posses a fine demarcation edge or line between them. The adjacent of two communities is represented by population of both the communitis, and this transtion zone between two communities is referred as ecotone. Rest of the options do not define ecotone (zone of transition). |
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| 740. |
At the equilibrium stage of sigmoid curve, population sizeA. shows minor fluctuationB. shows slow growthC. remains staticD. declines very slowly |
| Answer» Correct Answer - A | |
| 741. |
Biosphere isA. a component in the ecosystemB. composed of the plants present in the soilC. life in the outer spaceD. composed of all living organisms present on earth which interact with the physical environment |
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Answer» Correct Answer - D Biosphere is composed of all living organisms present on earth which interact with their physical environment. In other words a biosphere or ecosphere term is collectively used for all the ecosystems of world. Ecosphere or biosphere can not be defind by other three options, as they represent only a part of ecosystem. |
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| 742. |
Define Diapause. |
| Answer» It is periodical suspension of activity . | |
| 743. |
Does light factor affect the distribution of organisms? Write a brief note giving suitable examples of either plants or animals. |
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Answer» Plants require sunlight for photosynthesis. Therefore, light is an important factor that affects the distribution of plants. E.g., (i) Many species of small plants (herbs and shrubs) growing in forests are adapted to photosynthesise optimally under very low light conditions so they will be seen distributed in shady areas under tall, canopied trees. (ii) Many plants in the shade will grow vertically to gain access to light These plants will appear to have smaller leafs and smaller than others of the same species of the same age found in conditions with better sunlight. (iii) Large sized trees will be present in areas that get abundant sunlight. (iv) Plants dependent on sunlight to meet their photoperiodic requirements for flowering, will try to be distributed in area, where this requirement is being met for their reproductive success. |
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| 744. |
Competition among the plants in a community is forA. waterB. nutrientsC. sunlightD. All of these |
| Answer» Correct Answer - D | |
| 745. |
Hibernating animals have tissue containing mitochondria with a membrane protein that accelerates elerates transport while blocking the synthesiese of ATP, what is the consequence of thisA. the energy of respiration is converted into heat.B. pyruvate is converted to lactic by anaerobic fermentationC. energy is saved because glycolysis and citric acid cycle are shut downD. hibernating animals can synthesise fat instead of wasting energy on respiration. |
| Answer» Correct Answer - A | |
| 746. |
Define the following terms :(a) Migration (b) Stratosphere (c) Community (d) Biosphere |
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Answer» (a) Migration refers to movement of animal populations from one place to another and their subsequent return to avoid unfavourable climatic conditions . (b) It is the layer of atmospheric that extends between altitudes of about 16-50 kilometers . It has a ozone layer (ozonosphere) between altitude 25-50 kilometers. (c) Groups of organisms belonging to several different species that live together in the same area of habitat and interact through trophic and spatial relationship to form a self-sustained unit is called biotic community . (d) All the ecosystems of the world together form a biosphere. |
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| 747. |
Name one organism for each of the 3 categories of organisms regarding their mode of obtaining food . |
| Answer» Plants, animals , and bacteria and fungi . | |
| 748. |
Give the meaning and examples of epizoic animals . |
| Answer» Animals which live in on other animals without getting food from them (barnacle). | |
| 749. |
How do the genus and community differ ? |
| Answer» Species of a genus have a common ancestry and occur in different geographical regions . Species in a community do not have a common ancestry and inhabit common enviroment . | |
| 750. |
Neutral Day Plants |
| Answer» That are not affected by duration of day length (tomato) . | |