Outline salient features of carbon cycling in an ecosystem
Write important features of a sedimentary cycle in an ecosystem.
Give an account of energy flow in an ecosystem.
Define decomposition and describe the processes and products of decomposition.
What is primary productivity? Give brief description of factors that affect primary
productivity.
Define ecological pyramids and describe with examples, pyramids of number and
biomass.
Describe the components of an ecosystem
Difference Between Primary and secondary productivity
Difference Between Litter and detritus
Deference between Food chain and Food web
Difference Between Upright and inverted pyramid
difference Between (b) Production and decomposition
Difference Between Grazing food chain and detritus food chain
At a telephone enquiry system the number of phone calls regarding relevant enquiry follow Poisson distribution with a average of 5 phone calls during 10minute time intervals. The probability that there is at the most one phone call during a 10minute time period is?
Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is?
A pair of fair dice is thrown independently three times. The probability of getting a score of exactly 9 twice is?
Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is
A problem in mathematics is given to three students A, B, C and their respective probability of solving the problem is 1/2, 1/3 and 1/4. Probability that the problem is solved is?
List any three important characteristics of a population and explain
Select the statement which explains best parasitism.
(a) One organism is benefited.
(b) Both the organisms are benefited.
(c) One organism is benefited, other is not affected.
(d) One organism is benefited, other is affected.
With the help of suitable diagram describe the logistic population growth curve.
Define the following terms and give one example for each:
(a) Commensalism
(b) Parasitism
(c) Camouflage
(d) Mutualism
(e) Interspecific competition
Define population and community
Give an example for:
(a) An endothermic animal
(b) An ectothermic animal
(c) An organism of benthic zone
Define decomposition and describe the processes and products of decomposition.
Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals.
Distinguish between the following:
(a) Hibernation and Aestivation
(b) Ectotherms and Endotherms
What is the ecological principle behind the biological control method of managing with
pest insects
An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?
Name important defence mechanisms in plants against herbivory.
If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population?
List the attributes that populations but not individuals possess.
Most living organisms cannot survive at temperature above 45°C°. How are some microbes able to live in habitats with temperatures exceeding 100°C?
Define phenotypic adaptation. Give one example.
If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not?
How is diapause different from hibernation?
The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group15 of the periodic table is due to
Which one of the following groupings represents a collection of isoelectronic species?
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?
The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is
Which one of the following ions has the highest value of ionic radius?
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
Which among the following factors is the most important in making fluorine the strongest oxidising agent?
Lattice energy of an ionic compound depends upon
According to the periodic law of elements, the variation in properties of elements is related to their
Which is the correct order of atomic sizes?
(At. Nos. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)
The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be
Equimolal solutions in the same solvent have
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?
Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is