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

Question # 1

Differentiate between homogametic and heterogametic organism.

Ans 1: Homogametic organism: When an organism produce all the gametes of same type it is called homogametic.
Ans 2: Heterogametic organism:If an organism produce gametes of different type it is called heterogametic.

Question # 2

Define Desertification.

Ans 1: Conversion of cultivated or fertile soil into barren land or into desert form is called desertification.

Question # 3

Write practical application of apical dominance.

Ans 1: It can be used to produce smooth woody stem.
It is also used to increase the storage life of potato from 1 to 3 years.

Question # 4

What are the causes of herniation? Discuss.

Ans 1: Sever or sudden physical trauma to spines may result in herniation.The herniated disc usually involves the rupture of annulus fibrosus followed by protrusion of the spongy nucleus pulposus.

Question # 5

Differentiate between endangered and threatened species.

Ans 1: Endangered Species: Species which are near to extinct are called endangered species.
Ans 2: Threatened Species: The species which become endangered in near future are called threatened species.

Question # 6

State Law of independent assortment.

Ans 1: When two contrasting pairs of traits are followed in the same cross,their alleles are assorted independently into gametes.

Question # 7

What events occur in anaphase of mitosis?

Ans 1: During anaphase of mitosis spindle contract and centromere divides and two sets chromosomes are formed.Each set of chromosomes moves toward opposite poles.So that each pole receive one set of chromosomes.

Question # 8

What are jumping genes?

Ans 1: Jumping genes do not reside peacefully on their loci; they keep on hopping on different loci on the same chromosomes or other chromosomes.

Question # 9

Write down the treatment of cancer through gene therapy.

Ans 1: In cancer gene therapy patient is given genes which make either healthy cell more tolerant to chemotherapy or male tumor more vulnerable to it.Once the bone marrow stem cells were protected it was possible to increase the level of chemotherapy to kill the cancer cells

Question # 10

Differentiate between Sanger's method and Maxam-Gilbert method of gene sequencing.

Ans 1: Sanger's method: In Sanger's method dideoxyribo nucleoside triphosphates are used to terminate DNA synthesis at different sites.
Ans 2: Maxam-Gilbert method: In Maxam Gilbert method DNA threads are chemically cut into pieces of different size.

Question # 11

What types of animal life is found in tundra?

Ans 1: Standing pools provides habitat for mosquitoes.There may be ducks and geese.The tundra vegetation supports lemmings,which are eaten by wolves,snowy,owls,arctic foxes and even grizzly bears.

Question # 12

Write down the events of metaphase of mitosis.

Ans 1: The Kinetochore fibers of spindles attach to the kinetochore region (specialized area in centromere) of chromosomes and align them at the equator of the spindle forming equatorial plate or metaphase plate.

Question # 13

Where codon and anticodon are situated?

Ans 1: Codon are situated on mRNA(messenger RNA) while anticodon are situated on tRNA(transfer RNA).

Question # 14

What is monochromacy?

Ans 1: Monochromacy means only one colour can be perceived by the colour blind person.Monochromacy is true colour blindness.

Question # 15

Write down two methods for solving disputed paternity.

Ans 1: Two methods for solving disputed paternity is as follows:
Ans 2: i) Polymerase chair reaction (PCR)
ii) Restriction fragment length polymorphism (RELP).

Question # 16

What are meissner's corpuscles?

Ans 1: Meissner's corpuscles (encapsulated endings) which lie in papillae which extend into the ridges of the finger tips.The corpuscles consists of spiral and much twisted endings,each of which ends in knob.These are touch receptors.

Question # 17

Differentiate identical twins and triplets.

Ans 1: Identical twins: If new born organisms are the product of mitosis and they have same genetic makeup, they are called identical twins.
Ans 2: Identical Triplets: In some cases, more than one egg are produced by the female and all eggs are independently fertilized two or more zygote. These zygote develops into new offspring, but with different genetic combination. such twins or triplets are called fraternal twins or triplets. They are produced sexually.

Question # 18

Give the name of hormones which are involved in epinasty and hyponasty.

Ans 1: Epinasty is due to auxins and hyponasty is due to gibberellins.

Question # 19

What is reflex action?

Ans 1: Reflex action is a type of involuntary action.The direction of stimulus is from receptors to sensory neuron to associative neuron and then through motor neuron to the effectors.

Question # 20

Characterize profundal zone of fresh water lakes.

Ans 1: Here light is insufficient to support photosynthesis.This area is mainly nourished by detritus. Decomposers and detritus feeders such as snails and certain insect larvae,bacteria,fungi and fishes inhabit it.

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12 Class Fsc Part 2 Short Questions Online Preparation Biology

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