Question

B) State if the following statements are True or False. Correct the false statement:
1. Centrosome occurs in animal cells 2. Goitre is endemic in sub-Himalayan regions of India.
3. Contamination means entry of germs by insect bite.
4. The anus is surrounded by circular muscles.
5. The sclerenchyma consists of actively dividing cells .​

Answer 1

Answer:

1. True
2. True
3. False
4. True
5. False

Explanation:

1. centrosome occurs in animal ccells - Centrioles occur in the centrosomes. The centrosome is a cellular organelle which is the main microtubule organizing centre in an animal cell which also regulates the process of cell-cycle. They are made up of two centrioles which are right angled to each other and is composed of a protein known as tubulin.
2. The sub-Himalayan zone of India is considered an iodine deficiency disorders (IDD) belt. Assam is located in this belt; high prevalence of goitre and cretinism was documented from the state (Agarwal & Agarwal, 1983; Indian Coun- cil of Medical Research, 1989; Patowari, 1993).
3. The statement is false. Contamination means the entry of germs into drinking water or edible foods. The statement is true.
4. The internal anal sphincter is a thickened extension of the circular smooth muscle layer surrounding the colon and is generally considered responsible for maintaining approximately 70% of resting tone, ensuring that the anal canal is closed at rest.
5. The sclerenchyma consists of dead cells. They are long, narrow cells which have become dead.