CBSE Class 11 / NEET/ PMT - Biology - Ch 7 - Animal Tissues - Part 1 (Very Short Question and Answers) (#cbseNotes)

Animal Tissues (Part-1)

Very Short Q & A 

Q1: Define tissue?

Answer: A group of cells similar in structure, function and origin.


Q2: Can cells in a tissue be dissimilar in structure or function?

Answer: Yes the tissue cells can be dissimilar in structure and function but they are always similar in origin.


Q3: Who coined the word 'animal tissue'?

Answer: Bichat

😇 Note:
Marie François Xavier Bichat, a french anatomist. He is also known as father of histology. Unfortunately he died very young at the age of 30.

Q4: In how many types complex animal tissues are divided into?

Answer: Four Types.
⑴ Epithelial,
⑵ Connective,
⑶ Muscular and
⑷ Neural.


Q5: What is study of tissue called?

Answer: Histology (also called Microscopic anatomy).


Q6: Who is called father of microscopic anatomy?

Answer: Marcello Malpighi


Q7: What is the origin of epithelial tissue?

Answer: Ectoderm, endoderm, mesoderm


Q8: What do words 'Epi' and 'Thelio' mean in epithelium? 

Answer: Epi – Upon  and Thelio – grows
A tissue which grows upon another tissue is called Epithelium.


Q9: Are epithelial tissues vascularized?

Answer: No

😇 Vacularized meaning:
Provide (a tissue or structure) with vessels, especially blood vessels. Thus epithelial  cells depend for their nutrients on underlying connective tissue.

Q10: Name the three important functions of epithelial tissues?

Answer: Protection, secretion, absorption


Q11: Name the intercellular junctions present in epithelial cells.

Answer: Mainly seven types,
① Tight junctions (Zonula occludens)
② Interdigitations
③ Intercellular Bridge
④ Gap Junctions
⑤ Intermediate Junctions
⑥ Desmosomes
⑦ Hemidesmosomes


Q12: Give three examples of specialised functional structures of epithelial tissues.

Answer:
① Microvilli
② Cillia
③ Steriocilia



Q14: Based on number of layers of cells, name the two major groups epithelial tissues are divided into?

Answer:
① Simple epithelia - based on cell shape
② Compound epithelia - based on stretching ability



Q15: Name the types of simple epithelium tissues?

Answer: Simple epithelium is further divided into five types. These are
(i) Squamous,
(ii) Cuboidal,
(iii) Columnar
(iv) Ciliated
(v) Pseudostratified


Q16: Which epithelium is also called pavement epithelium?

Answer: Simple squamous


Q17: Are simple squamous epithelium unilayered or multilayered?

Answer: Unilayered


Q18: Which type of epithelia are found in the following?

⑴ Secretory unit of salivary glands, sebaceous gland
⑵ Bowman's capsule
⑶ Pancreatic duct
⑷ Inner lining of cheeks
⑸ Bile Duct
⑹ Nails
⑺ Alveoli of lungs
⑻ Stomach Fallopian Tube
⑼ Urinary Bladder
⑽ Inner lining of blood vessels and lymph vessels
⑾ Epidermis of skin


Answer:

⑴ Secretory unit of salivary glands, sebaceous gland - Stratified cubical
⑵ Bowman's capsule - Simple squamous
⑶ Pancreatic duct - Simple Cuboidal Epithelium
⑷ Inner lining of cheeks - Stratified squamous
⑸ Bile Duct - Simple Columnar epithelium
⑹ Nails - Startified Squamous
⑺ Alveoli of lungs - Simple squamous
⑻ Stomach - Gladndular columnar epithelium
⑼ Urinary Bladder - Transitional epithelium
⑽ Inner lining of blood vessels and lymph vessels - Simple squamous
⑾ Epidermis of skin - Startified Squamous


Q19: Where do we find Ciliated Columnar epithelium?

Answer: Fallopian Tube


Q20: What are the main functions of compound epithelia?

Answer: Protection against chemical and mechanical stresses. (limited role in secretion and absorption)


Q21: What do gap junctions perform?

Answer: Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.


Q22: Single layer of tall, narrow cells; vertically oriented; ciliated in some organs; may possess goblet cells; present in Inner lining of stomach, intestines, gallbladder; main functions are Absorption and secretion. Identify the epithelial tissue?


Answer: Simple Columnar Epithelium


Q23: Name the two kinds of stratified squamous epithelia?

Answer: keratinized and nonkera-tinized


Q24: Name the epithelia present in the lining of respiratory tract which help moving mucus from the lungs toward the throat.

Answer: Ciliated epithelium