Select the correct statements with reference to chordates.
\(A\). Presence of a mid-dorsal, solid and double nerve cord.
\(B\). Presence of closed circulatory system.
\(C\). Presence of paired pharyngeal gill slits.
\(D\). Presence of dorsal heart
\(E\). Triploblastic pseudocoelomate animals.
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Identify the part of the seed from the given figure which is destined to form root when the seed germinates.

Placenta and pericarp are both edible portions in

Identify the correct statements about biomolecules.
A. Lipids are generally water soluble.
B. Proteins are polypeptides.
C. Polysaccharides are long chains of sugars.
D. Adenine and guanine are substituted pyrimidines.
E. Almost all enzymes are proteins.
Choose the correct answer from the options given below :

\(DNA\) is not present in

Match the following sexually transmitted diseases (column \(I\)) with their causative agent (column \(II\)) and select the correct option.

Column \(-I\)	Column \(-II\)
\((A)\) Gonorrhoea	\((i)\) HIV
\((B)\) Syphilis	\((ii)\) Neisseria
\((C)\) Genital warts	\((iii)\) Treponema
\((D)\) AIDS	\((iv)\) Human papilloma virus

Pollen tablets are available in the market for

Which of the following is the least likely to be involved in stabilising the three dimensional folding of most proteins?

The current passing through the battery in the given circuit, is :

Compound \(P \left( C _8 H _8 O \right)\) gives a red orange precipitate with 2, 4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, \(P\) gives an aromatic product \(Q\) that produces effervescence on treating with aq. \(NaHCO _3\). Compounds P and Q , respectively, are :

A radioactive nucleus \({ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}\) undergoes spontaneous decay in the sequence \({ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X} \rightarrow {}_{\mathrm{Z}-1}{\mathrm{B}} \rightarrow {}_{\mathrm{Z}-3 }\mathrm{C} \rightarrow {}_{\mathrm{Z}-2} \mathrm{D}\), where \(\mathrm{Z}\) is the atomic number of element \(X.\) The possible decay particles in the sequence are :

Which of the following statements are correct with reference to a transcription unit ?
A. A transcription unit in DNA is defined primarily by three regions : promoter, structural gene and terminator.
B. The promoter is said to be located towards the \(5^{\prime}\)-end of the structural gene.
C. The promoter is a DNA sequence that provides binding site for RNA polymerase.
D. The promoter defines the template and coding strands.
E. The terminator is located towards the \(3^{\prime}\)-end of the coding strand and it defines the end of the process of transcription.
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In a certain planetary system, it is observed that one of the celestial bodies having a surface temperature of \(200 \;K\), emits radiation of maximum intensity near the wavelength \(12\; \mu m\). The surface temperature (in \(K\)) of a nearby star which emits light of maximum intensity at a wavelength  \(\lambda= 4800\;\mathring A\) is