Thyroid Gland - Hormones and their functions

Thyroid gland is a bilobed, butterfly-shaped organ which is the largest endocrine gland in the body. The medical term for thyroid gland is "glandula thyreoidea". It secretes three hormones: T3 hormone, T4 hormone and Calcitonin. 

• Weight: 20-60 grams
• Size: 2-inches long

Wharton described the Thyroid gland for the first time.

Who was Mendel and why he selected garden pea for breeding experiments?

Gregor Mendel is know as the Father of Genetics who has postulated three Laws of Inheritance - Law of Dominance, Law of Segregation and Law of Independent Assortment.

In this article we will study about:

• Who was Gregor John Mendel - Father of Genetics?
• 7 traits studied by Mendel
• Reasons for selecting garden pea (Pisum sativum) for breeding experiments

ICSE 2018: The diagram given below represents a stage during cell division. [mitosis]

ICSE 2018:

Q. The diagram given below represents a stage during cell division. [5 marks] 

Study the same and answer the questions that follow:

(i) Identify whether it is a plant cell or an animal cell. Give a reason in support of your answer. 

(ii) Name the stage depicted in the diagram. What is unique feature observed in this stage? 

(iii) Name the type of cell division that occurs during: 

1. Replacement of old leaves by new ones. 

2. Formation of gametes. 

(iv)  What is the stage that comes before the stage shown in the diagram?

(v) Draw a neat, labelled diagram of the stage mentioned in (iv) above keeping the chromosome number constant

Solution: