Monohar Pandey Solutions for Exercise 2: Exercise 2

The $\mathrm{year} 2011$ has been marked by the livestock disease named

Assertion (A) If somebody stops taking green vegetables he will suffer from night blindness.
Reason (R) He will suffer from vitamin-A deficiency.
Select the correct answer from the code given below.

Study the following statements
$1.$ Oral pills of birth control prevent ovulation.
$2.$The Gestation period in humans is 9 months.
$3.$ A Surgical procedure in which a small portion of sperm duct is removed and cut end is ligated in male is called vasectomy.
Which of the statements given above are correct?

Consider the following statements about Progeria
$1.$ Progeria is a genetic disease associated with fast aging.
$2.$ Progeric patients never live beyond their early twenties.
$3.$ It happens due to point mutation replacing cytosine with thymine.
Which of the statements given above is/are correct?

Which of the following professionals are more likely to run the risk of a permanent change in their cell's DNA?
$1.$Researchers using carbon 14 isotope
$2.$ X-ray technician
$3.$Coal miner
$4.$ Dyer and painter

Study the following statements-
$1.$Vitamin C was the first vitamin to be produced by a fermentation process using Acetobacter.
$2.$Vitamin B$-12$ is produced by Propionic bacterium and Pseudomonas.
Which of the statements above is/are correct?

Match the following columns.
List I                              List II
A. Neomycin    $1.$ Streptomyces fradiae
B. Terramycin   $2.$ Penicillium notatum
C. Viridin         $3.$ Streptomyces rimosus
D. Penicillin     $4.$Gliocladium virens
Codes

Vitamin $B_{12}$ deficiency causes pernicious anemia. Animals cannot synthesize vitamin $B_{12}$ . Humans must obtain all their vitamin $B_{12}$ from their diet. The complexing metal ion in vitamin$B_{23}$  is :