Question Discussion & Solution

Elements of diagram are moving in clockwise direction and 1 dot is added in each step.

The complete diagram is as follows,

final is used to apply restrictions on class, method, and variable. final is a keyword.

finally is used to place important code, it will be executed whether an exception is handled or not.

System is a class. finalize and main are methods.

Hence, “8” will come in the place of question mark. 

Concept-

Vestigial organs are the organs that once were useful in an animal's body millions of years ago, but now they are useless or very close to useless.

Key Points Human heart-

• The human heart is not vestigial as at present times it has its own functions in the human body.
• The human heart is an organ that pumps blood throughout the body.
• Heart pumps the blood through the vessels of the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
• The tissues of the body need a constant supply of nutrition in order to be active which is performed by blood.

Additional Information Wisdom teeth

• Wisdom teeth are no longer totally necessary. Today, humans cook food to soften it, and we can cut and crush it with utensils.So at this time they are vestigial.
• Early humans needed to chew coarse, hearty foods, they required a broader jaw.
• Wisdom teeth grew in to give them more chewing power for this purpose.

Nictitating membrane of eye

• In humans, the nictitating membrane is the pink lump in the inner corner of the eyes which is known as the caruncula lacrimalis.
• In this structure, the remaining of the nictitating membrane are permanently folded into that corner and no longer functional.So it is vestigial.

Vermiform appendix

• The human appendix may be considered as a vestigial organ as it has been proved that the removal of the organ after infancy does not create any harm.
• Its function is to digest cellulose.

The correct answer is option 4, i.e Carbon.

• Carbon forms the maximum number of compounds in the periodic table.
• Since carbon has the property of tetra valency and catenation so they can form a maximum number of compounds.
• Carbon exists in several allotropic forms. Graphite and diamond are examples of allotropes of carbon that have different properties.
• The atomic number of carbon= 6. It lies in the 14th group in the periodic table.