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
To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is
6.02 × 10^20 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is
If liquids A and B form an ideal solution, the
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was
In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking Kf for water as 1.85, the freezing point of the solution will be nearest to
Freezing point of an aqueous solution is (–0.186)°C. Elevation of boiling point of the same solution is K b = 0.512°C, K f = 1.86°C, find the
increase in boiling point.
An organic liquid with sweet smell and b.pt 78°C contains C, H and O. On heating with conc. H2SO4 gives a gaseous product (B) of empirical formula (CH2)n. Compound (B) decolourises bromine water and alk. KMnO4. (B) also reacts with one mole of H2 in presence of Ni. What are (A) and (B)?
Sulphanilic acid although has acidic as well as basic group, it is soluble in alkali but insoluble in mineral acid
Although both polymers are prepared by free radical processes, poly (vinyl chloride) is amorphous and poly (vinylidene chloride) (saran) is highly crystallilne. How do you account for the different? (vinylidene chloride is 1,1- dichloroethene).
Treatment of (+)– glucose with HIO4 gives results that confirm its aldohexose structure. What product should be formed, and how much HIO4 should be consumed?
Consult internet and find out how to make orally active protein pharmaceutical. What is the major problem to be encountered?
Does our blood have proteases and nucleases
Find out from internet what is golden rice.
Can you suggest a method to remove oil (hydrocarbon) from seeds based on your understanding of rDNA technology and chemistry of oil?
Diagrammatically represent the experimental steps in cloning and expressing an human
gene (say the gene for growth hormone) into a bacterium like E. coli ?
Diagrammatically represent the experimental steps in cloning and expressing an human
What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.
What are Cry proteins? Name an organism that produces it. How has man exploited this
protein to his benefit?
Compare and contrast the advantages and disadvantages of production of genetically modified crops.