Which of the following is always upright in an ecosystem?

Match List I with List II.

LIST I	LIST II
A. Dodo	I. Australia
B. Quagga	II. Mauritius
C. Thylacine	III. Africa
D. Stellar's Sea cow	IV. Russia

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Read the following passage carefully and answer the given questions.
Restriction endonuclease on finding its specific recognition sequence, bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar -phosphate backbones. Each restriction endonuclease recognises a specific palindromic nucleotide sequences in the DNA. Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and also lipids. This can be achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus). Now a days the most commonly used matrix is agarose which is a natural polymer extracted from sea weeds. The DNA fragments separate (resolve) according to their size through sieving effect provided by the agarose gel. The first restriction endonuclease-Hind II, whose functioning depended on a specific DNA nucleotide sequence was isolated and characterised five years later. It was found that Hind II always cut DNA molecules at a particular point by recognising a specific sequence of six base pairs. In addition to 'ori', the vector requires a selectable marker, which helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants. Transformation is a procedure through which a piece of DNA is introduced in a host bacterium. Normally, the genes encoding resistance to antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin, etc., are considered useful selectable markers for E. coli.
A natural polymer extracted from sea weeds used in the field of biotechnology is:

Steps of replication of retrovirus (HIV) in the host cell are given below. Arrange the steps in correct sequence.
(A) Viral RNA is introduced in host cell
(B) New viruses with new RNA are produced
(C) Viral DNA is produced by reverse transcription
(D) Viral DNA incorporates into host genome
(E) Virus infects the normal cell
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Which of the following statements are NOT true for biopiracy?
(A) It is the use of bio-resources by multinational companies with proper authorisation by the concerned country
(B) Developing countries are rich in biodiversity
C) Developed countries are rich in traditional knowledge related to bio resources
(D) Biopiracy involves inadequate compensation and benefit sharing between developed and developing countries, while using latter's bioresources by the former
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Amniotic fluid is used to:
(A) Determine the survivability of the foetus
(B) Massive child immunization
(C) Check for pneumonia
(D) Check genetic disorder
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Three cells grouped together at the micropylar end and constitute __________ in the embryo sac.

The area of the region given by \(\left\{(x, y): y \geq x^2, y \leq|x|+2\right\} \backslash-\backslash-\backslash-\backslash-\backslash-\) is

The number of mono bromo structural isomers formed by free radical bromination of isopentane are

Which of the following are fat soluble vitamins :
(A) vit A
(B) vit B
(C) vit D
(D) vit E
(E) vit K
Choose the \textbf{correct} answer from the options given below :

The work function of a photosensitive material is 4.0 eV. The longest wavelength of light that can cause electron emission from the material is (approximately)

Three charges \(+4 q, Q\) and \(q\) are placed along \(x\)-axis at points, \(x=0, I / 2\) and I respectively. The value of Q to make the net force on \(q\) to be zero :

During the process of spermatogenesis, the secondary spermatocytes
undergo ___________ division to produce ___________ spermatids