Science Class 8 0 To 20

Science Class 8th

1. The use of living organism for human being is called

A. Biochemistry

B. Biotechnology

C. Bioscience

D. Manipulation

2. The ultimate goal of biotechnology

A. To increase the yield of product of living organism

B. To increase living organism

C. To increase human

D. All

3.How biotechnology improve yield of product from living organism

A. Changing there DNA

B. Feed then more

C. By itself

4) Major achievement of biotechnology in pre 20th century

A. Identification of living cell and bacteria

B. discovery of small pox and rabies vaccine

C. Artificial sweeteners

D. DNA and chromosome


5)Major break through of biotechnology in 20th century

A. Pencillin

B. 3D structure of DNA

C. Fabrication of artificial limb and first clone

D. All

6)When first clone of mamal was made

A. 20th century

B. 21st century

C. Pree 21 century

D. None

7)Which mamal was first cloned

A. Sheep

B. Goat

C. Cow

D. Dog

8)First mamal sheep was cloned there name was

A. Sheep

B. Clony

C. Dolly

D. Statement us wrong

9)Major break through of biotechnology in 21st century

A. Vertebrate,invertebrate and bacterial genome

B. Completion of human genome sequence

C. Sequencing of rice genome,invent of bionic leg

D. All

10)Unique property of DNA

A. Replicate itself

B. Make itself larger

C. Does not replicate

D. None

11)During replication DNA makes copies which are

A. Different from parent DNA

B. Same as parent DNA

C. Both above are possible

D. None

12)DNA is

A. Basic heredity unit

B. Responsible for transfer of character

C. Does not transfer character

D. Both A and B

13)DNA has

A. Helical structure

B. Straight

C. Round

D. All possible

14)First step of DNA replication is

A. Unwinding double helical structure

B. Produce new strands

C. The two strand separate

D. Both a and C

15)2nd step of DNA replication is

A. Produce new strands

B. Unwind its strands

C. Two strands separates

D. All

16)Unwinding and separation of two strands occurs in which step of DNA replication

A. 1st

B. 2nd

C. 3rd

17)During replication DNA makes new strands from

A. Nucleotides present in cytoplasm

B. Nucleitide present in nucleus

C. Nucleotide of parent DNA

D. All possible

18.During replication one DNA molecule produce

A. ONE DNA molecule

B. Two

C. Three

D. Fou

19)Each DNA molecule contain how much strands

A. Two

B. Three

C. Four

D. Single

20)Daughter DNA produce as a result of replication have

A. One new strand and one parent

B. Both new

C. Both above are possible

D. All

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