MCQs on Developmental biology

1.     Stapes bone of middle ear evolved from

a)     Hyomandibular arch

b)    Jaw bone

c)     Ear bone

d)    None of the above

2.     The quadrate bone of reptilian upper jaw evolved into the mammalian  ------ bone of the middle ear & the articular bone of the reptile’s lower jaw has become our ------

a)     Malleus, incus 

b)    Incus, malleus

c)     Incus, articular

d)    None of the above

3.     Piebaldism, is due to dominant mutation in a gene (KIT) on long arm of chromosomes 4. This syndrome include

a)     Fertility, pigmentation

b)    Sterility, dumbness

c)     Anemia, sterility, unpigmented region of the skin & hair, deafness & the absence of nerve that cause peristalsis in the gut

d)    None of above

4.     Abnormalities due to exogenous agents (certain chemicals or viruses, radiation, or hyperthermia) are called disruptions. The agent responsible for these disruptions are called

a)     Teratogens

b)    Inducer

c)     External mutant

d)    All of above

5.     The study of how environmental agents disrupt normal development is called as---

a)     Abnormal developmental biology

b)    Teratology

c)     Both

d)    None

6.     Thalidomide, prescribed as a mild sedative to many pregnant woman, caused an enormous increase in a previously rare syndrome of congenital anomelies. The most noticeable of these anomalies was phocomelia , a condition in which the long bones of the limb are---

a)     Deficient or absent

b)    Highly calcified

c)     Low calcium

d)    a&c

7.     Estrogen hormone can instruct the ----- to make & secrete the yolk proteins, which are then transported through the blood into the enlarging eggs in the ovary

a)     Liver

b)    Spleen

c)     Ovarian duct

d)    Uterus

8.     Gastrulation in the frog begins at a point on the embryo surface roughly 180 degree opposite the point of sperm entry with the formation of a dimple, called the 

a)     Blastopore

b)    Archenteron

c)     Blastocyst

d)    None

9.     During amphibian development the cells that had connected the neural tube to the epidermis become the

a-   Notochord

b-   Neural crest cells

c-   Neural plate

d-   Both b & c

10.  Metamorphosis of amphibian larva is

a)     Progressive

b)    Retrogressive

c)     Neoteny

d)    None

Answer: 1-a, 2-b, 3-c, 4-a, 5-b, 6-a, 7-a, 8-a, 9-b, 10-b

Contributed by: Ms. Nargis K.