Daily NEET MCQ- February 26, 2022 - NEET MCQ

It is well recognized that the primary immunoglobulin (Ig) of the newborn is the maternal IgG as this is the only IgG to cross the placental barrier. On the other hand, it is IgM which is synthesized by the newborn in the early postnatal period followed by IgA and IgG.

Babies are born with low levels of IgA. Then, as the weeks and months go on, a baby's immune system makes more IgA and the levels slowly rise. But, when a baby breastfeeds during this early period of life, he gets high levels of IgA from breast milk. Therefore, breast milk IgA is absorbed by the infant's small intestine for up to 6 months of life.

Hence, the correct option is (D).

Option (A) is correct because Juxtaglomerular cells of kidney secrete erythropoietin hormone which stimulates R.B.C. formation. 

Alpha cells of pancreas produce hormone glucagon. 

The cells of rostral adenohypophysis synthesizes hormones of anterior lobe of pituitary. 

The cells of bone marrow are responsible for formation of formed elements. 

Hence, the correct option is (A).

Light travels at different speeds in a different medium. The bending or refraction of light occurs due to the change in the speed of light as it passes from one medium to another. Other statements are not true regarding the refraction of light.

Since the C-F bond length will be shorter than the C-Cl bond length due to the smaller size of F atom, it will require more energy to break the C-F bond, hence the enthalpy value of C-Cl bond will be lower than that of C-F bond.

Colour blindness is a X-linked recessive disorder. In it, the affected individual has is not able to distinguish colour especially read and green. X-lined disorders are inherent disorders due to mutation in the X chromosome which causes the phenotype to be always expressed in male and in female only in homozygous condition. The daughter will receive one X chromosome from the father (the chromosome with colour blindness gene) and other X (normal chromosome) from mother. Therefore, all daughters born will be carriers.

The son will receive Y chromosome from the father and a X chromosome from the mother. Thus, all sons will be normal.

Hence, the correct option is (A).

A local population adapted genetically to its particular environment is called ecotype. There may be several ecotypes of the same organism which show variation amongst them.

Hence, the correct option is (B).

If the magnification of the mirror is one, then it is a plane mirror. If magnification is more than one, the mirror is concave. If magnification is less than one, then the mirror is convex. So the X required in this question is a concave mirror.

As the critical angle for diamond – oil interface is greater than that for the diamond – air interface, the shining of diamond reduces when it is dipped in transparent oil.

3-Bromopropene has 3 C atoms in the parent chain with a double bond at C-1 and Br at C-3. This means that Br is attached to the C which is next to the C-C double bond, hence it is an allylic halide.

The IUPAC name of Isobutyl chloride is 1-Chloro-2-methylpropane, which means the parent chain consists of 3 carbon atoms with an alkyl group at C-2 and a halogen at C-1.