Ribs attached to sternum are

MCQ

✓

Answer

Correct option: A.

First seven pairs

a
(a) There are usually $12$ pairs of ribs in human body, first seven pairs of ribs are known as true ribs because these are atteched to sternum.

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Statement I: Protonephridia or flame cells are the excretory structure of Planaria.
Statement II: Nephridia are the tubular excretory structures of earthworm.

Statement I: Juxta glomerular apparatus (JGA) is a sensitive region formed by cellular modifications in the proximal convoluted tubule and afferent arteriole at the location of their content.
Statement II: A fall in GFR can activate the JG cells to release renin.

$R$ - $AIDS$ is caused by $HIV$.

$A$. This disorder was first described by Langdon Down $(1866)$.

$B$. Such an individual has overall masculine development. However, the feminine developement is also expressed.

$C$. The affected individual is short statured.

$D$. Physical, psychomotor and mental development is retarded.

$E$. Such individuals are sterile.

Choose the correct answer from the options given below:

Assertion: In humans, a normal female has sex chromosomes (XX) and male has sex chromosomes as (XY).
Reason: In chicken, sex chromosomes in male are ZZ and in females are ZW.