The correct sequence of the formation of pollen grains is -
(A) Sporogenous tissue
(B) Formation of microspore
(C) Microspore tetrad formed by meiotic divisions
(D) Pollen grains develop from microspores
Choose the correct answer from the options given below

Read the given passage carefully and answer the questions
Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Sustained high fever (39° to 40°C), weakness, stomach pain, constipation, headache and loss of appetite are some of the common symptoms of this disease. Typhoid fever could be confirmed by Widal test. Plasmodium enters the human body as sporozoites. The parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Cannabinoids are a group of chemicals, which interact with cannabinoid receptors present principally in the brain. Generally taken by inhalation and oral ingestion, these are known for their effects on cardiovascular system of the body.
Widal test is used to diagnose

Identify, which is not the recently extinct species?

Arrange the given steps involved in Polymerase Chain Reaction.
(A) Annealing
(B) Extension
(C) Denaturation
(D) Amplification
Choose the correct answer from the options given below:

In some organisms, male has ZZ chromosomes and female has ZW chromosomes. This type of sex-determination is found in:

Match List I with List II

LIST I	LIST II
A. Heroin	I. Atropa belladona
B. Marijuana	II. Erythroxylum coca
C. Cocaine	III. Cannabis sativa
D. Hallucinogenic properties	IV. Papaver somniferum

Choose the correct answer from the options given below:

The Evil Quartet' of biodiversity loss is -

The value of \(\sin ^{-1}\left(\frac{8}{17}\right)+\sin ^{-1}\left(\frac{3}{5}\right)\) is :

Observe the given figures and answer the question

The conditions created by Miller in his experiment were:

The value of \(x\) for which the matrix \(A = \begin{bmatrix} 1 & -2 & 3 \\ 1 & 2 & 1 \\ x & 2 & -3 \end{bmatrix}\) is singular is:

(A) f(x) = |x| is continuous function on R (the set of real numbers)
(B) f(x) = [x] is continuous function on R
(C) f(x) = sin x is continuous function on R
(D) f(x) = tanx is continuous function on R
(E) f(x) = sinx + cosx is continuous function on R

Arrange the given steps involved in gel electrophoresis used for separation of DNA fragments?
(A) Exposure to UV light
(B) Staining with ethidium bromide
(C) Movement of DNA fragments towards anode
(D) Elution
Choose the correct answer from the options given below:

Which of the following reactions are involved in preparation of aldehydes?
(A) Gatterman-Koch reaction
(B) Etard Reaction
(C) Stephen Reaction
(D) Rosenmund Reaction
Choose the correct answer from the options given below: