What external changes are visible after the last moult of a cockroach nymph?

1.  Mandible become harder

2.  Anal cerci develop

3.  Both fore wings and hind wings develop

4.  Labium develops

Select the correct statement from the ones given below with respect to Periplaneta americana.

(1) Nervous system dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives

(2) Males bear a pair of short thread like anal styles

(3) There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

(4) Grinding of food is carried out only by the mouth parts

Which of the following is correctly states as it happens in the common cockroach?

(1) Oxygen is transported by haemoglobin in blood

(2) Nitrogenous excretory product is urea

(3) The food is ground by mandibles and gizzard

(4) malpighian tubules are excretory organs projecting out from the colon

The kind of epithelium which forms the inner walls of blood vessels is 

(1) cuboidal epithelium

(2) columnar epithelium

(3) ciliated columnar epithelium

(4) squamous epithelium

The epithelial tissue present on the inner surface of bronchioles and fallopian tubes is

(1) cuboidal

(2) glandular

(3) Ciliated

(4) squamous

The cell juctions called tight, adhering and gap junctions are found in

(1) muscular tissue

(2) connective tissue

(3) Epithelial tissue

(4) neural tissue

In which one of the following preparations are you likely to come across cell junctions frequently ?

(1) Ciliated epithelium

(2) Thrombocytes

(3) Tendon

(4) Hyaline cartilage

Areolar connective tissue joins :

(1) fat body with muscles

(2) integument with muscles

(3) bones with muscles

(4) bones with bones

The process by which most of the cartilaginous tissue is transformed into bones is

1. endochondral ossification

2. intermembranous ossification

3. calcification

4. none of the above

Adjacent cells are interconnected by 

(1) desmosomes

(2) vacuoles

(3) mitochondria

(4) E.R.