Structural Organisation in Plants and Animals
Structural Organization in Animals
In which one of the following preparations are you likely to come across cell junctions most frequently
Read the following statement and select the correct option
Statement 1 : Urinary bladder is lined by transitional epithelium
Statement 2 : Transitional epithelium keeps the size of bladder constant at all time.
Which part of the alimentary canal of earthworm (in the given figure) helps in grinding the soil particles ?
Mark the odd one in each series:
(a) Areolar tissue, blood, neuron, tendon
(b) RBC, WBC, platelets, cartilage
(c) Exocrine, endocrine, salivary gland, ligament
(d) Maxilla, mandible, labrum, antennae
(e) Protonema, mesothorax, metathorax, coxa
Given below are four statement (i) - (iv) each with two blanks. Select the option which correctly fills up the blanks in any two of these statements
(i) The columnar epithelium is composed of 1 and slender cells. Their 2 are located at the base
(ii) Collagen fibres provide 3 and elastin fibres provide 4 and elasticity to the tissue
(iii) Adipose tissue is a 5 type of connective tissue located mainly beneath 6
(iv) Tendons attach 7 to bones and ligaments attach 8 to bones.
Assertion : Stomach and intestine of our body has columnar epithelium
Reason : Columnar epithelium helps is secretion and absorption.
Which of the following statements about cell junctions are correct ?
(i) All the cells of the epithelium are held together with little intercellular materials
(ii) In almost all animal tissues specialised junctions provide both structural and functional link between their individual cells
(iii) Tight junctions prevent substances from leaking across a tissue
(iv) Adhering junctions provide cementing to keep neighbouring cells together
(v) Gap junction provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.