Which layer of microsporangium provides nutrition to the developing pollen grains?

Recombinant DNA technology involves the following steps in a specific sequence.
(A) Culture of the host cell
(B) Extraction of desired product
(C) Isolation of desired DNA fragments
(D) Transformation of the recombinant DNA into the host cell
Arrange these sequences correctly and choose the correct answer from the options given below:

Read the following passage carefully and answer the given questions.
The B-lymphocytes produce an army of proteins in response to pathogens. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur. The primary lymphoid organs are bone marrow and thymus. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. Heroin commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum.
Which one of the followings drug does not reduce the symptoms of allergy quickly?

Identify the contraceptive measure which can not be practiced by human females:

In which type of RNA, methyl guanosine triphosphate capping is added to 5'-end ?

In malignant tumor, the cells proliferate, grow very rapidly and move to other parts of body to form new tumors. This property is called:

Observe the illustration and answer the following question:

Which of the following is TRUE for spermatogenesis and oogenesis?
A. Spermatogenesis starts at puberty
B. Oogenesis starts at puberty
C. Two sperms are formed from one primary spermatocyte
D. One ovum is formed from one primary oocyte
Choose the most appropriate answer from the options given below:

Match List-I with List-II

List-I (Name of Compound)	List-II (Application)
(A) Neutral Ferric Chloride	(I) Anaesthetic
(B) Methanol	(II) Detection of Phenolic group
(C) Diethylether	(III) Wood Spirit
(D) Acetylsalicylic acid	(IV) Analgesic

Choose the correct answer from the options given below:

The rate constant of a reaction increases from \(0.02 \mathrm{~s}^{-1}\) to \(0.04 \mathrm{~s}^{-1}\) when the temperature is raised from 500 K to 600 K.
The activation energy \(\left(E_a\right)\) of the reaction is
(Given: \(\log _{10} 2=0.3010\) )

Match List - I with List - II.

List - I	List - II
(A) Diamagnetic solid	(I) \(CrO _2\)
(B) Ferromagnetic solid	(II) \(Fe _3 O _4\)
(C) Antiferromagnetic	(III) NaCl
(D) Ferrimagnetic solid	(IV) MnO

Choose the correct answer from the options given below :

Arrange the steps involved in creating pest-resistant transgenic plants using RNA interference (RNAi).
(A) Binding of complementary RNAs to form double-stranded RNA (dsRNA).
(B) Formation of sense and antisense RNA in the host cells.
(C) Silencing of specific mRNA of the nematode.
(D) Introduction of nematode-specific genes into the host plant using Agrobacterium vectors.
Choose the correct answer from the options given below:

Match List I with List II.

LIST I	LIST II
A. Lungs of the planet	I. Bali tiger
B. Invasive species	II. Taxol
C. Anti cancer drug	III. Amazon rain forests
D. Extinct species	IV. Parthenium

Choose the correct answer from the options given below:

When dilute aqueous solution of \(\text{KI}\) (excess) is added to \(\text{AgNO}_3\) solution, the charge on the \(\text{AgI}\) colloidal, particles formed will be :