Arrange the following stages of primary succession in water in correct sequence.
A. Rooted submerged plants
B. Marsh meadows
C. Phytoplanktons
D. Scrubs followed by trees
E. Free floating plants
Choose the correct answer from the options given below:

Which enzyme modified by genetic engineering is used as a 'clot buster'?

Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. 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. 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.
Heroin, commonly called smack is chemically _________ which is a white, odourless, bitter crystalline compound.

Identify the statements which are not true with respect to Heterochromatin.
(A) Loosely packed
(B) Densely packed
(C) Stains light
(D) Transcriptionally active
Choose the correct answer from the options given below :

A novel strategy to prevent infestation of roots of tobacco plant with the nematode Meloidegyne incognitia is :

The formation of pomato is an example of:

Which one of the followings is an indirect measure of the organic matter present in water?

If the order of matrix \(A\) is \(4 \times 3\), order of matrix \(B\) is \(4 \times 5\) and order of matrix \(C\) is \(5 \times 3\), then the order of matrix \((B \cdot C) A^{\prime}\) is :

If the speed of rotation of the armature of a generator is increased, how would it effect (i) The maximum emf produced (ii) The frequency of the emf?

Three bad eggs are mixed with 7 good ones
If two eggs are drawn one by one without replacement
then the probability distribution of the number X of bad eggs drawn is

The condition for observing diffraction from a single slit is that the light wavefront incident on the slit should be

Arrange the correct sequence of steps for gel electrophoresis.
(A). Load this DNA into the agarose gel matrix
(B). Cutting the DNA fragments by using a restriction enzyme
(C). Use ethidium bromide for DNA staining
(D). Separated bands of DNA are cut out from agarose gel
Choose the correct answer from the options given below.

In a concave mirror, an object is placed at a distance \( x \) from the focus and the image is formed at a distance \( y \) from the focus. What is the focal length of the mirror?