Exoskeleton of arthropods is composed of :
(A)Glucosamine
(B)Cutin
(C)Cellulose

(D)Chitin

DNA polymorphism forms the basis of :
(A)Translation
(B)Genetic mapping
(C)DNA finger printing

(D)Both genetic mapping and DNA finger printing

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to : (a) secretion of secondary metabolities and their deposition in the lumen of vessels. (b) deposition of organic compounds like tannins and resins in the central layers of stem. (c) deposition of suberin and aromatic substances in the outer layer of stem. (d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. (e) presence of parenchyma cells, functionally active xylem elements and essential oils. Choose the correct answer from the options given below:
(A)
(b) and
(d) Only

(B)
(a) and
(b) Only
(C)
(c) and
(d) Only
(D)
(d) and
(e) Only

Which of the following is not observed during apoplastic pathway?
(A)Apoplast is continuous and does not provide any barrier to water movement.
(B)Movement of water occurs through intercellular spaces and wall of the cells.
(C)The movement does not involve crossing of cell membrane

(D)The movement is aided by cytoplasmic streaming

Given below are two statements: Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance Statement II : Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height In the light of the above statements, choose the correct answer from the options given below:
(A)Statement I is incorrect but Statement II is correct

(B)Both Statement I and Statement II are correct
(C)Both Statement I and Statement II are incorrect
(D)Statement I is correct but Statement II is incorrect

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants :
(A)Cytokinin
(B) `` ABA ``
(C)Gibberellin

(D)Ethylene

While explaining interspecific interaction of population, `` (+) `` sign is assigned for beneficial interaction, `` (-) `` sign is assigned for detrimental interaction and `` (0) `` for neutral interaction. Which of the following interactions can be assigned `` (+) `` for one species and `` (-) `` for another species involved in the interaction?
(A)Competition

(B)Predation
(C)Amensalism
(D)Commensalism

If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:
(A)Bioinformatics

(B)Sequence annotation
(C)Gene mapping
(D)Expressed sequence tags

Which of the following occurs due to the presence of autosome linked dominant trait?
(A)Thalessemia
(B)Sickle cell anaemia

(C)Myotonic dystrophy
(D)Haemophilia

Which one of the following will accelerate phosphorus cycle?
(A)Rain fall and storms
(B)Burning of fossil fuels
(C)Volcanic activity

(D)Weathering of rocks

Read the following statements on lipids and find out correct set of statements : (a) Lecithin found in the plasma membrane is a glycolipid (b) Saturated fatty acids possess one or more `` c = c `` bonds (c) Gingely oil has lower melting point, hence remains as oil in winter (d) Lipids are generally insoluble in water but soluble in some organic solvents (e) When fatty acid is esterified with glycerol, monoglycerides are formed Choose the correct answer from the options given below:
(A)
(a),
(b) and
(d) only
(B)
(a),
(b) and
(c) only
(C)
(a),
(d) and
(e) only

(D)
(c),
(d) and
(e) only

Which part of the fruit, labelled in the given figure makes it a false fruit?
(A) `` D \rightarrow `` Seed
(B) `` A \rightarrow `` Mesocarp
(C) `` B \rightarrow `` Endocarp

(D) `` C \rightarrow `` Thalamus

In the following palindromic base sequences of DNA, which one can be cut easily by particular restriction enzyme?
(A)5' G T A T T C3' ; 3' CATA A G5'
(B)5' GATACT3'; 3' CTATGA 5'

(C)5' GAATTC3'; 3' CT T A A G 5'
(D)5'CTCAGT3'; 3' GAGTCA 5'

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R). Assertion (A) : Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome. Reason (R): Closely located genes assort independently. In the light of the above statements, choose the correct answer from the options given below:
(A)(A) is not correct but (R) is correct
(B)Both (A) and (R) are correct and (R) is the correct explanation of (A)
(C)Both (A) and (R) are correct but ( R ) is not the correct explanation of (A)

(D)(A) is correct but ( R ) is not correct

The entire fleet of buses in Delhi were converted to `` CNG `` from diesel. In reference to this, which one of the following statements is false?
(A)It can not be adulterated like diesel
(B)CNG burns more efficiently than diesel

(C)The same diesel engine is used in CNG buses making the cost of conversion low
(D)It is cheaper than diesel