Find the 12th Class Fsc Part 2 Short Questions Online Preparation Biology

Question # 1

Write about cleavage and discoidal cleavage.

Ans 1: The series of mitotic divisions after fertilization of egg is called cleavage.Process of cell division is confined to the small disc of protoplasm laying on the surface of yolk at animal pole.This type of cleavage is called discoidal cleavage.

Question # 2

What are different metabolic wastes in humans?

Ans 1: Following are the metabolic wastes.
1. Urea
2. Uric acid
3. Bilirubin
4. Creatinine
5. Xanthine
6. Hypoxanthine

Question # 3

Two Normal parents have an albino child.What is the probability that their next child will also be an albino?

Ans 1: 3 of their sons will be normal and one will be albino that is the ratio is
Normal : Albino
3 1

Question # 4

Differentiate between neurula and neurocoel.

Ans 1: Neurula: In the embryo of 24 hrs the neural folds are clearly visible,at this stage embryo is called neurula.
Ans 2: Neurocoel: In the chick development with the formation of neural tube,there is formation of central nervous system and the cavity enclosed is called neurocoel.

Question # 5

What is hypophosphatemic rickets?

Ans 1: It is an X linked dominant trait.It is rare hereditary disease.it does not result from vitamin D deficiency but its cause is a genetic communication failure at molecular level.The genes encoding bone proteins never receive vitamin D message to function.

Question # 6

Define gene pool.

Ans 1: The total aggregate of genes present in a population is called gene pool or whole genetic information present in a population is called gene pool.

Question # 7

What are three sets of microtubules which originate from each pair of centriole during mitosis?

Ans 1: Three sets microtubules originate from centrioles are asteral microtubules radiate outward and from aster while other two sets of microtubules compose the spindle i.e the kinetochore microtubules and polar microtubules.

Question # 8

What is role of progestrone in pregnancy?

Ans 1: The end or complete stop of menstrual cycle is called menopause. After menopause female can't produce any more ovum or egg & can't give birth to any child.

Question # 9

Differentiate between autosome and sex chromosomes.

Ans 1: Autosome chromosomes: Chromosomes which do not contain genes for sex determination or chromosomes other than sex chromosomes are called autosomes.
Ans 2: Sex chromosomes: Chromosomes which play role in sex determination are called sex chromosomes.

Question # 10

What is parasitism?

Ans 1: Process in which a parasite lives in living organisms and cause some harm to its host is called parasitism or relationship between host and parasite is called parasitism.

Question # 11

What are restriction enzymes?Who first isolated them?

Ans 1: These are natural enzymes of bacteria which they use for their own protection against viruses. The restriction viruses cut down the viral DNA,but does not harm to the bacterial chromosome.In 1970,Hamilton'O smith isolated the first restriction enzyme.

Question # 12

Characterize digitigrades animals.

Ans 1: Animals which walk on the tips of their digits only are called digitigrades.They run faster than plantigrade animals.In these animals first digit usually reduces or completely lost as in rabbit, rodents.

Question # 13

What is primitive streak?

Ans 1: In the chick the mesodermal cells do not invaginate but migrate medially and caudally from both sides and create a mid line thickening called primitive streak.

Question # 14

What are metabolic defects and give two example?

Ans 1: Bones are malformed and one organ or its part is missing or it may be repeated.

Question # 15

What is the difference between savanna and prairies?

Ans 1: Prairies:Grass land ecosystem present in temperate climate is called prairies.Grass land without woody trees is also known as Prairies.
Ans 2: Savanna:Grass land ecosystem with woody plants is called Savanna.

Question # 16

Differentiate between conservative and dispersive replication of DNA.

Ans 1: Conservative Replication: Conservative replication stated that the parental strands would remain intact and generate DNA copies consisting of entirely new molecules.
Ans 2: Dispersive Replication: Dispersive model states that parental DNA would become completely dispersed and that each strand of all the daughter molecules would become mixture of old and new DNA.

Question # 17

Differentiate between population and gene pool.

Ans 1: Population: Member of same species living in an area at the same time at same place is called population.
Ans 2: Gene pool: Total aggregate of genes present in a population at any one time is called gene pool.

Question # 18

Differentiate between ureotelic and uricotelic animals.

Ans 1: Ureotelic Animals: Animals which excrete urea are called ureotelic e.g sharks.
Ans 2: Uricotelic Animals: Animals which excrete uric acid are called Uricotelic.e.g Birds, insects.

Question # 19

Define Biodiversity.

Ans 1: The variety of organisms present in an area is called biodiversity.

Question # 20

Name any two parts of hind limb.

Ans 1: Ilium and ischium.

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12 Class Fsc Part 2 Short Questions Online Preparation Biology

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