Read the passage and answer the question given below.
When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins, antibodies are produced in the host body. This type of immunity is called active immunity. Active immunity is slow and takes time to give its full effective response. Injecting the microbes deliberately during immunisation or infectious organisms gaining access into body during natural infection induce active immunity. When antibodies are directly given to protect the body against foreign agents, it is called passive immunity.
colostrum secreted by mother during initial stage of lactation provides passive immunity as it is rich in.

During allergic reactions, which of the followings are secreted?
(A) Histamines
(B) Interferons
(C) Serotonin
(D) Pyrogens
Choose the correct answer from the options given below:

The function of the tapetum is:

Identify the correct statements for pollen grains
(A) Pollen grain represents male gametophyte.
(B) Pollen grain is a haploid unicellular body.
(C) The hard exine of the pollen is made up of sporopollenin.
(D) The intine of the pollen is composed of oxidative polymers of
carotenoids or carotenoid esters.
Choose the correct answer from the options given below:

Medical termination of pregnancy (MTP) is considered relatively safe -

Arrange the following steps of Polymerase Chain Reaction in proper sequence.
(A) Amplification of DNA
(B) Annealing of primer
(C) Extension of primer
(D) Denaturation of ds DNA
Choose the correct answer from the options given below:

Air bubbles are sparged into bioreactor tanks. The role of these bubbles is to:

Which of the following happens when a ray of light enters into a water filled glass beaker from air?

A function \(f: R \rightarrow\{x \in R:-1< x<1\}\) is defined as \(f(x)=\frac{x}{1+|x|}\), then \(f\) is :

The function \(f(x)=2 \log _e(x-2)-x^2+4 x+1,(x>2)\) is increasing on the interval :

H-bond does not exist in:

If \(\vec{a}=\hat{i}+\hat{j}+\hat{k}, \vec{b}=\hat{j}-\hat{k}\) and \(\vec{c}=\hat{i}+\hat{j}+\hat{k}\) such that \(\vec{r} \times \vec{b}=\vec{c} \times \vec{b}\) and \(\vec{r} \cdot \vec{a}=0\), then \(\vec{r}\) is :

Organic compounds derived from NH3 by replacing one or more H-atoms with alkyl or aryl groups will form primary, secondary and tertiary amines. The common methods which include their preparations are reduction of nitro group, amide group and nitrile group, Gabriel phthalimide synthesis and ammonolysis of alkyl halides. Amines are basic in nature due to the presence of a lone pair of electrons on the nitrogen atom. Important chemical properties of amines include acylation, alkylation and their interaction with nitrous acid. There are various tests which can distinguish different types of amines from each other, for e.g. carbylamine test, Hinsberg's test, coupling reaction etc. Another important class of compounds which can be derived from primary amines is azo compounds. These compounds are intensely colored and widely used as dyes in textile, leather and food industries.
Correctly predict the final product and the type of reaction for the following reaction:
\(C _6 H _5- N _2^{+} Cl ^{-}+ C _6 H _5- OH \xrightarrow{ HO ^{-}}\)?