In humans, the fertilization takes place at -

Arrange the following events of the menstrual cycle in the correct
sequence:
(A) The rising level of FSH stimulates the growth of the ovarian follicle and
secretion of estrogen.
(B) The corpus luteum secretes progesterone to maintain the endometrium.
(C) The rapid secretion of LH leads to the rupturing of the Graafian follicle.
(D) The release of unfertilized secondary oocyte leads to the menstrual
cycle.
Choose the correct answer from the options given below:

Amoebiasis in humans is caused by

In RNAi, the genes are silenced by the formation of:

Identify the correct statements regarding EcoRI:
(A) It cuts DNA between A and T when GAATTC palindrome is present in the DNA
(B) It produces blunt ends in the fragments
(C) The blunt ends facilitates the action of the enzyme
(D) It cuts DNA between G and A when GAATTC sequence is present in the DNA
(E) GAATTC is the palindrome recognized by EcoRI
Choose the correct answer from the options given below : Only

Identify the gene which is not effective against cotton boll worms?

Match List - I with List - II.

LIST I	LIST II
A. Law of independent assortment	I. 9:3:3:1
B. Incomplete dominance	II. 3:1
C. Law of dominance	III. AB blood group
D. Co-dominance	IV. Flower colour in Snapdragon

Choose the correct answer from the options given below:

Identify the correct properties of magnetic field lines.
(A) Magnetic field lines are directed from the south pole to the north pole outside the
magnet.
(B) The magnetic field lines never intersect each other.
(C) Magnetic lines always form a closed and continuous curve.
(D) If magnetic field lines are parallel, then the magnetic field must be uniform throughout.
Choose the correct answer from the options given below :

A long wire with a small current element of length 1 cm is placed at the origin and carries a current of 10 A along the x-axis. The magnitude of the magnetic field, due to the element, on the y-axis at a distance \( r = 0.5 \, m \) from it, would be

Consider the region bounded by the lines \(y-1=x, x=-2, x=3\) and \(x\)-axis. Then,
(A) The area of the bounded region is given by \(\int_{-2}^3(x+1) d x\)
(B) The numerical value of the area is \(\frac{15}{2}\) sq. units
(C) The numerical value of the area is 8 sq . units
(D) The numerical value of the area is \(\frac{17}{2}\) sq. units
Choose the correct answer from the options given below:

When benzene diazonium chloride is treated with halogen acid in the presence of copper powder, the reaction is referred to as

In the cyanide extraction process of silver the oxidising and reducing agents used are:

Read the passage carefully and answer the Questions
Haloalkanes undergo nucelophilic substitution reactions owing to the polarity of CX bond. The nucleophile reacts with the haloalkane on the carbon possessing a partial positive charge holding the halogen atom. The halogen atom X is replaced by a nucleophile. Depending on the kinetics and mode of bond breaking, the mechanism can be either SN1 or SN2 reaction. The rate of SN1 reaction is governed by the stability of carbocation and in SN2 reaction, the rate of reaction is governed by steric factor. Chirality is the main factor in both SN1and SN2. In SN1 reaction, the chirality of alkyl halide is accompanied by racemization of the product, while in SN2 reaction, the product is characterized by inversion of configuration. The structure of alkyl halide and the nature of the solvent also governs the mechanism of the substitution.
What is meant by the term racemic mixture?