The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia, which are joined by paired longitudinal connectives along the ventral side.
(a) How many ganglia are present in the (i) thorax and (ii) abdomen, respectively?
(b) A cockroach can survive for as long as one week, even if its head is severed from the body. Give reason.
(c) What represents the brain in a cockroach? Name the parts/organs to which it supplies nerves.

In the figure, some parts of alimentary canal of a cockroach are shown. Name the organs (A), (B) and (C). State the function of each of these organs.

 

The diagram given below depicts the mouth parts of a cockroach. Answer the questions that follow:

(a) What type of mouth parts does a cockroach possess?
(b) Identify and name the part that acts as
(i) lower lip
(ii) upper lip
(iii) tongue
(c) Name the mouth part that is used for grinding and incising.

The body of a cockroach is segmented and divisible into three regions - head, thorax and abdomen. The entire body is covered by an exoskeleton made of chitin.
(a) Write the scientific name of the common species of cockroach.
(b) How many segments are there in each of the following?
(I) Head,
(ii) Thorax,
(iii) Abdomen
(c) What name is given to the hardened plates of the exoskeleton of each segment? How are they joined to each other?

Three types of muscle tissue are shown in the picture given above.
(a) Identify the type of muscle tissue A, Band C.
(b) Mention one location or site in a human body, where each of them is present.

The diagrammatic representation of a type of loose connective tissue is given above. Answer the following questions based on that.
(a) Identify the type of connective tissue.
(b) Identify and name the three types of cells present in it.
(c) Mention two functions of the cells

Connective tissues are the most abundant and widely distributed tissues in the body of complex animals. They range from loose connective tissues to specialized types.
(a) Why are connective tissues named so?
(b) Name two types of loose connective tissues.
(c) Why is blood called a fluid connective tissue?

Unicellular and multicellular glands are shown in the figure given above. Answer the following questions.
(a) Name the types of epithelial cells that become specialised for secretion.
(b) Give an example each, of unicellular and multicellular glands in our body.
(c) Name the types of glands based on the mode of pouring their secretion

In nearly all animal tissues, specialised junctions provide both structural and functional links between the individual cells of the tissue. Three types of cell junctions are found in the epithelium and other tissues.
Name the three types of cell junctions and mention one function of each of them.