Which one of the following is a correct statement about dormancy?

Which of the following statements are correct with respect to T.H. Morgan?
(A) His experiment led to discovering the basis for the variation that sexual reproduction produced.
(B) He mapped the position of genes on the chromosomes.
(C) He coined the term linkage.
(D) He crossed yellow-bodied, white-eyed Drosophila females to brown-bodied red-eyed Drosophila males and observed the results contrary to that of Mendel's.
Choose the correct answer from the options given below:

The statements are not true for allergy :
(A) Allergy is due to release of chemicals like histamine and serotonin
(B) Allergens are the subtances which cause allergy
(C) The antibodies produced due to allergens are IgA type
(D) Adrenalin and steroids quickly enhance the symptoms of allergy
Choose the correct answer from the options given below :

Identify the correct sequence of structures formed during spermatogenesis.
(A) Spermatozoa
(B) Secondary spermatocytes
(C) Spermatogonia
(D) Spermatids
Choose the correct answer from the options given below:

Where are IUDs placed in the human female reproductive sytem for contraception?

Read the following passage carefully and answer the given questions.
Immune System in the Body
The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as H2L2. Different types of antibodies are produced in our body. IgA, IgM, IgE, IgG are some of them. 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.
Which one of the following technique is not useful for the detection of cancers of internal organs?

During the process of spermatogenesis, the secondary spermatocytes
undergo ___________ division to produce ___________ spermatids

The magnifying power of a telescope is 6 in normal adjustment. The distance between its two lenses is 35 cm. The focal lengths of objective and eye-piece are, respectively:

The product \(( Y )\) in the following reaction is
\(2 C_6 H_5 CHO \xrightarrow[\text { Hest }]{\text { conc. } NaOH} Y+C_6 H_5 COONa\)

If \(x = at^2, y = 2at\) then \(\frac{d^2y}{dx^2} =\)

The relative order of reactivity of \(1^\circ, 2^\circ, 3^\circ\) alcohol towards dehydration is :

Enthalpy of atomisation of transition elements can be arranged in increasing order as:
A. \(V\)
B. \(Cr\)
C. \(Mn\)
D. \(Fe\)
E. \(Co\)
Choose the correct answer from the options given below:

Magnetic material that moves from stronger to weaker part of magnetic field is: