The first menstruation which begins at puberty is called :

Observe the diagram and answer the following questions:

Which enzyme can form DNA from RNA?

Read the following paragraph and answer the given questions.
Cancer detection is based on biopsy and histopathological studies. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs. Do you know why mother's milk is considered very essential for the new-born infant? The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal. The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Drugs like barbiturates, amphetamines, benzodiazepines, and other similar drugs, that are normally used as medicines to help patients cope with mental illnesses like depression and insomnia, are often abused. Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery.
Which one of the following is not used for detection of cancer?

Which one of the following is not the sacred groves?

Which of the following is always upright in an ecosystem?

The capacity to generate a whole plant from any cell is called:

DNA fingerprinting works on the principle of

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

Statins are produced by the yeast -

The curves \(x=y^2\) and \(x y= K\), cut at right angles if :

Arrange the following stages of oogenesis in order of their occurrence.
(A) Ovum
(B) Oogonia
(C) Primary oocyte
(D) Secondary oocyte
Choose the correct answer from the options given below :

Ex situ conservation include:

If we plot graph for first order reaction involving reactant \(R\), then it will be a straight line if plotted for :