Biology Objective question answer Class 10th Class 12th Latest update Trending Trending news

Biology class 12th solved questions paper:: क्लास 12th क्वेश्चन पेपर सॉल्वड

Biology class 12th solved questions paper:: क्लास 12th क्वेश्चन पेपर सॉल्वड

1. What does operon model represent?

(A) Gene synthesis
(B) Gene expression
(C) Gene regulation
(D) Gene function

Ans:::(C) Gene regulation

2. Thalamus is edible part in which of the following?

(A) Annona
(B) Apple
(C) Orange
(D) All of these

Ans:: (B) Apple

3. DNA is genetic material of?

(B) Bacteriophage
(C) Both (A) and (B)
(D) None of these

Ans:: (B) Bacteriophage

4. Flow of energy in food chain
of an ecosystem is ?

(A) Unidirectional
(B) Bidirectional
(C) Multidirectional
(D) None of these

Ans:::(A) Unidirectional

5. Which of the following is not a biofertilizer?

(A) Azotobacter
(B) Bacillus thuringiensis
(C) Azolla
(D) Clostridium

Ans:: (B) Bacillus thuringiensis

6.Tuberculosis is transmitted by?

(A) Water
(B) Air
(C) Insect
(D) Contact

Ans:: (B) Air

7. Bio-reactors in optimal conditions produce

(A) Product
(B) Organism
(C) Medium
(D) All of these

Ans:: (A) Product

8. Aril is edible in which of the following fruits?

(A) Myristica
(B) Litchi
(C) Annona
(D) All of these

Ans:: (B) Litchi

9. Indicator of SO₂ pollution is

(A) Algae
(B) Lichen
(C) Fungi
(D) All of these

Ans:: (B) Lichen

10. Honey is made by?

(A) male honeybee
(B) Queen honeybee
(C) Worker honeybee
(D) Both ‘A’ and ‘B

Ans:: (C) Worker honeybee

11. Which disease is found in hen?

(A) Cholera
(B) Smut
(C) Both ‘A’ and ‘B’
(D) Ranikhet

Ans:: (D) Ranikhet

12. The flour of Idli and Dosa is made by the use of which microbe?

(A) Bacteria
(B) Lactobacillus
(C) Virus
(D) Yeast

Ans::: (A) Bacteria

13. Agarose is extracted from?

(A) Maize
(B) Sea weeds
(C) Cycas
(D) None of these

Ans:: (B) Sea weeds

14. Operon model was proposed by?

(A) Watson and Crick
(B) Nirenberg
(C) Jacob and Monad
(D) None of them

Ans:::(C) Jacob and Monad

15. Menstrual cycle occurs in

(A) Human
(B) Monkey
(C) Chimpanzee
(D) All of these

Ans:: (D) All of these

16. Binary fission occurs in

(A) Amoeba
(B) Paramecium
(C) Both ‘A’ and ‘B’
(D) None of these

Ans::(C) Both ‘A’ and ‘B’

17. In a DNA molecule, the cytosine is 18%,percentage of adenine will be ?

(A) 64
(B) 36
(C) 85
(D) 32

Ans::: (D) 32

18. Widal test is done to confirm

(A) Malaria
(B) Typhoid
(D) Cancer

Ans:: (B) Typhoid

19. HIV attacks on which of the following cells?

(A) B-cell
(B) T-cell
(C) Epithelial cell
(D) T-helper cell

Ans:::(D) T-helper cell

20. The substances to which an immune response is produced, are called

(A) Allergens
(B) Vaccines
(C) Antibodies
(D) Antigens

Ans:::(D) Antigens

21. Chemical released due to allergy is

(A) Histamine
(B) Serotonin
(C) Both ‘A’ and ‘B’
(D) None of these

Ans:::(C) Both ‘A’ and ‘B’

22. Which one forms endosperm after fusion with male gamete?

(A) Oospores
(B) Antipodals
(C) Synergids
(D) Secondary nucleus

Ans:::(D) Secondary nucleus

23. One gene pair hides the effect of another gene pair. This phenomenon is

(A) Epistasis
(B) Dominance
(C) Mutation
(D) None of these

Ans:::(A) Epistasis

24. A sequence of three bases on rRNA which binds to mRNA codon is

(A) Triplet
(B) Non-sense codon
(C) Anticodon
(D) Termination codon

Ans:: (C) Anticodon

25. The group of Wuchereria bancrofti which causes filaria in human being is ??

(A) Protozoa
(B) Bacteria
(C) Virus
(D) Helminth

Ans:: (D) Helminth

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