Embryologically, the body of cockroach is formed of 20 segments. What is the number in each region?

1. Head - 6; Thoracic - 3; Abdominal - 11

2. Head - 1; Thoracic - 3; Abdominal - 10

3. Head - 3; Thoracic - 3; Abdominal - 11

4. Head - 0; Thoracic - 3; Abdominal – 10

 

The presence of anal styles distinguishes male cockroaches from females. It is present on :
1. Ninth tergite                
2. Ninth sternite
3. Tenth tergite               
4. Tenth sternite

Seminal vesicles :

1. are a part of reproductive system of male cockroach and are associated with utricular gland

2. are a part of reproductive system of female cockroach and are associated with utricular gland

3. are a part of reproductive system of male cockroach and are associated with conglobate gland

4. are a part of reproductive system of female cockroach and are associated with collaterial gland

Assertion   :       Mast cells in the human body release excessive amounts of inflammatory chemicals which cause allergic reactions.

Reason      :       Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

Assertion   :       Histamine is related with allergic and inflammatory reactions.

Reason      :       Histamine is a vasodilator.

Assertion             :       Specialization of cells is advantageous for the organism.

Reason                :       It increase the operational efficiency of an organism.

Assertion   :     Cartilage (protein matrix) and bone (calcium matrix) are rigid connective tissue.

Reason      :     Blood is connective tissue in which plasma is the matrix.

Assertion   :       Bones possess longitudinal canals called lacunae.

Reason      :       Lacunae carry blood vessels & nerves to the bones.

Assertion   :       Surface of skin is impervious to water.

Reason      :       Surface of skin is covered by stratified cuboidal epithelium.