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What is incorrect regarding Periplaneta americana?
Blood [hemolymph has no RBC or pigment]. Oxygen is delivered by system of tubes.
NCERT Page 113
The type of caartilage present in the epiglottis, pinna and tip of the nose is:
Factual
Dense irregular connective tissue is present in:
Page 103, XI NCERT
The most abundant and widely distributed tissue in the bodies of complex animals is:
Page 102, XI NCERT
The function of the gap junction is to
A gap junction may nexus or macula communicans. These are specialised intercellular connection between a multitude of animal cell-types. They directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.
Which one of the following animals has two separate circulatory pathways?
The circulatory system in which two distinct and separate circulatory pathways for blood flow are involved, is called double circulatory system (also, double-loop circulatory system). It occurs in mammals and birds whale is a mammal so it shows above characteristic.
The terga sterna and pleura of cockroach body are joined by
NCERT, PAGE NO 111
STRUCTURAL ORGANISATION IN ANIMALS
7.4.1 Morphology
Choose the corectly matched pair.
Areolar tissue is a loose connective tissue, and provide flexibility and cushioning. Adipose tissue is also loose connective tissue while, the tendon is a dense connective tissue, which connect the muscles with the bone. Cartilage is composed of specialsed connective tissue called chondrocytes that produce a large amount of extracellular matrix composed of collagen fibre.
Which of the following is correctly states as it happens in the common cockroach?
In cockroach, mandibles are a pair of hard, strong, large, dark coloured triangular, structures which move in horizontal motion and crush food between them. Gizzard or proventriculus has an outer layer of thick circular muscles and thick inner cuticle forming six highly chitinous plate called teeth. The gizzard acts as the grinding chamber and helps in grinding the food particles.
The kind of epithelium which forms the inner walls of blood vessels is
Simple squamous eepithelium consists of only one layer of flat, scale like cells usually polygonal cells, which are closely fitted together like the tiles of a mosaic. It is also known as pavement epithelium. It forms lining of blood vessels, lymph vessels, heart, peritoneum, pleura, Bowman's capsule etc.
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