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

• Mandibles become harder

• Anal cerci develop

• Both fore wings and hind wings develop

• Both fore wings and hind wings develop

2.

The function of the gap junction is to

• performing cementing to keep neighbouring cells together

• facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.

• separate two cells from each other

• separate two cells from each other

The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of 

• ammonia

• potassium urate

• urea

• urea

Pheretima and its close relatives derive nourishment from

• sugarcane roots

• decaying fallen leaves and soil organic matter

• soil insects

• soil insects

Choose the correctly matched pair.

• Tendon - Specialised connective tissue

• Adipose tissue - Dense connective tissue

• Tubular parts of nephrons - Cuboidal epithelium

• Tubular parts of nephrons - Cuboidal epithelium

Compared to those of humans, the erythrocytes in frog are

• without nucleus but with haemoglobin

• nucleated and with haemoglobin

• very much smaller and fewer

• very much smaller and fewer

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

• Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives

• Males bear a pair of short thread like anal styles

• There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

• There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

Given below is the diagrammatic sketch of a certain type of connective tissue. Identify the parts labelled A, B, C and D, and select the right option about them.

• Part A	Part B	Part C	Part D
  Macrophage	Fibroblast	Collagen fibres	Mast cells

• Part A	Part B	Part C	Part D
  Mast cell	Macrophage	Fibroblast	Collagen fibres

• Part A	Part B	Part C	Part D
  Macrophage	Collagen fibres	Fibroblast	Mast cell

• Part A	Part B	Part C	Part D
  Macrophage	Collagen fibres	Fibroblast	Mast cell

The four sketches (A, B, C and D) given below, represent four different types of animal tissues. Which one of these is correctly identified in the options given, along with its correct location and function?

• Tissue	Location	Function
  Glandular epithelium	Intestine	Secretion

• Tissue	Location	Function
  Collagen fibres	Cartilage	Attach skeletal muscles to bones

• Tissue	Location	Function
  Smooth muscle tissue	Heart	Heart contarction

• Tissue	Location	Function
  Smooth muscle tissue	Heart	Heart contarction

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

• Five

• Six

• Eight

• Eight