Which of the following is the correct sequence of trophic levels in a grazing food chain?

An inverted pyramid of biomass can be found in:

The typical angiosperm embryo sac at maturity has:

A DNA fragment contains 18% Thymine (T). The combined content of Cytosine (C) and Guanine in it would be:

Match List-l with List-ll

List-l (Organisms)	List-II (Types of interaction)
(A) Barnacles Balanus and Chathamalus in the intertidal area	(I) Mutualism
(B) Orchid growing on a mango branch	(II) Competition
(C) Plants and herbivores	(III) Predation
(D) Mycorrhiza between fungi and roots of higher plants	(IV) Commensalism

Choose the correct answer from the options given below:

Which of the following does not have direct role in genetic engineering?

Baculoviruses are pathogens that attack:

In order to fabricate n-type semiconductor, the impurity elements used are

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Nearly all the transition elements display typical metallic properties such as high tensile strength, ductility, malleability, high thermal and electrical conductivity and metallic lustre. The transition metals (with the exception of Zn, Cd and Hg) are very hard and have low volatility. Their melting and boiling points are high. They have high enthalpies of atomization. lons of the same charge in a given series show progressive decrease in radius with increasing atomic number. However, the variation within a series is quite small. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number. The net result of the lanthanoid contraction is that the second and the third d series exhibit similar radii (e.g., Zr 160 pm, Hf 159 pm) and have very similar physical and chemical properties. There is an increase in ionisation enthalpy along each series of the transition elements from left to right. The first ionisation enthalpy, in general, increases, but the magnitude of the increase in the second and third ionisation enthalpies for the successive elements, is much higher along a series. One of the notable features of a transition elements is the great variety of oxidation states these may show in their compounds.
Atomic number of Fe, Co, Ni and Cu are 26, 27, 28 and 29 respectively. Which among them is expected to possess the highest value for the second ionization enthalpy?

An aqueous solution of glucose is labelled as 20% w/w. If the density of the solution is 1.2 g/mL the molality of the solution.

Incorrectly functioning globin is characteristic of__________

The electric field at 20 cm from the center of a conducting sphere of radius 2 cm is \( 4.5 \times 10^3 \, \text{N C}^{-1} \). The magnitude of charge on the sphere is:

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The crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. The five d orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ion. However, when this negative field is due to ligands (either anions or the negative ends of dipolar molecules like NH3 and H2O) in a complex, it becomes asymmetrical and the degeneracy of the d orbitals is lifted. It results in splitting of the d orbitals. The pattern of splitting depends upon the nature of the crystal field.
The hybridisation and magnetism of the complexes \(\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}\) and \(\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}\) respectively is: