MCQ on Biogeochemical Cycle (Nutrient cycle)

1. The main nitrogen reservoir in the biosphere is  

a) rock

b) ocean

c) organism

d) atmosphere

2. The sedimentary cycle is

a)oxygen

b)nitrogen

c)carbon

d)phosphorus

3. Which is the most common available form of S to plants

a) S

b) SO2

c) SO²₄+

d) H2S

4. Phosphorus cycle in the form of

a)HPO₃^-

b)P2

c) PO₄²-

d) AIPO₃

5. The largest reservoir of phosphorus in the biosphere is the

a)atmosphere

b) rock

c) organism

d) ocean

6. Fixation occur with the help of

 a)symbiotic bacteria

b)with the help of nitrogenise enzyme

c)leguminous nodules

d)all of these

7. Among the following biogeochemical cycles which one does not have losses due to respiration?

a)phosphorus

b)nitrogen

c)sulphur

d)all of these

8. The Phosphorus cycle is unusual in that it is entirely

a)within the aquatic ecosystem

b) within the terrestrial ecosystem

c) gaseous

d) sedimentary

9. Nitrogen is critical elements of the ecosystem because it is

a) labile

b) fixed by microbes

c) abundant in atmosphere

d) essential element

10. Which of the following atoms most often limits the primary productivity of an ecosystem?

a) Carbon

b) Nitrogen

c) Sulphur

d) Phosphorus

Learn more: 

• MCQ on Biogeochemical cycle
• Diagram Quiz on Nitrogen cycle
• MCQ on Nitrogen cycle
• Difference between Energy flow and Nutrient cycling

Answers:

1. d) atmosphere

2. d)phosphorus

3. c) SO²₄+

4. c) PO₄²-

5. b) rock 

6. d)all of these

7. d)all of these

8.d) sedimentary

9.d) essential element

10. d) Phosphorus

Read More

MCQ on Bacteria and Bacteriophage

1. Bacteria whose cells have only a single curve are known

a) vibrio

b) cocci

c) sprilla

d) bacilli

 2. Plasmid

a)replicate independently of the main chromosome

b)often contain antibiotic resistance genes

c)are transferred from one bacterium to another by conjugation

d)all of these

3. Largest among sulphur bacteria are

a) Chlorobium

b) Beggiatoa

c)Thiobacillus

d) Chromatium

4. Infectious proteins

a) Prions

b)Virusoids

c) Virion

d) None of these

5. Provirus is

a)a free DNA

b) an integrated viral genome

c) a free virus

d)a primitive virus

6. Germ theory of disease was putforth by

a)Edward Jenner

b)Weismann

c)Louis Pasteur

d)Robert Koch

7.Bacteria differ from other plants in that they do not have

a)DNA

b)RNA

c)cell wall

d)a well defined nucleus

8. Bacteriophage kill

a) viruses

b) bacteria

c) viruses and bacteria

d) none of these

9. Mesosome in a bacteria cell is?

a) plasmid

b) plasma membrane infolding for respiration

c) connection between two adjacent cells

d) none of these

10. The wall of bacteria consists of

a) Cellulose

b) N acetyl glucosamine

c) N acetyl muramic acid

d) both b and c

Learn more:

• MCQ on Bacteria
• MCQ on Bacteriophage

Answer:

1.a) vibrio

2. d) all of these

3. b) Beggiatoa

4. a) Prions

5. b) an integrated viral genome

6. b) Weismann

7. d) a well defined nucleus

8. b) bacteria

9. a) plasmid

10. d) both b and c

Read More

2018 NEET UG Biology Questions and Answers (81-90)

81. Select the incorrect match :
(1) Submetacentric – L-shaped chromosomes chromosomes
(2) Allosomes – Sex chromosomes
(3) Lampbrush – Diplotene bivalents chromosomes
(4) Polytene chromosomes – Oocytes of amphibians

Answer (4 )

82. Which of the following terms describe human dentition?
(1) Pleurodont, Monophyodont, Homodont
(2) Thecodont, Diphyodont, Heterodont
(3) Thecodont, Diphyodont, Homodont
(4) Pleurodont, Diphyodont, Heterodont

Answer ( 2 )

83. Which of the following events does not occur in rough endoplasmic reticulum?
(1) Cleavage of signal peptide
(2) Protein glycosylation
(3) Protein folding
(4) Phospholipid synthesis

Answer ( 4 )

84. Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
(1) Plastidome
(2) Polyhedral bodies
(3) Polysome
(4) Nucleosome

Answer (3)

85. In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?
(1) Ringworm disease
(2) Ascariasis
(3) Elephantiasis
(4) Amoebiasis

Answer (3)

86. Which of the following is not an autoimmune disease?
(1) Alzheimer's disease
(2) Rheumatoid arthritis
(3) Psoriasis
(4) Vitiligo                                                                                                     Answer (1)

87. Among the following sets of examples for divergent evolution, select the incorrect option :
(1) Brain of bat, man and cheetah
(2) Heart of bat, man and cheetah
(3) Forelimbs of man, bat and cheetah
(4) Eye of octopus, bat and man                                                                   Answer (4)

88. Conversion of milk to curd improves its nutritional value by increasing the amount of
(1) Vitamin B12
(2) Vitamin A
(3) Vitamin D

(4) Vitamin E 

                                                                                                                        Answer (1)

89. The similarity of bone structure in the forelimbs of many vertebrates is an example of
(1) Convergent evolution
(2) Analogy
(3) Homology
(4) Adaptive radiation
Answer ( 3 )

90. Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance
(1) b, d and e (2) a, b and c (3) b, c and e (4) a, c and e

Answer ( 2 )

Read More

NEET Biology Questions and Answers 2018 (71-80)

71. AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
(1) ACCUAUGCGAU (2) UGGTUTCGCAT
(3) AGGUAUCGCAU (4) UCCAUAGCGUA

Answer (3) AGGUAUCGCAU 

72. Match the items given in Column I with those in Column II and select the correct option given below :
Column I                                                    Column II
a. Proliferative Phase                i. Breakdown ofendometriallining
b. Secretory Phase                    ii. Follicular Phase
c. Menstruation                         iii. Luteal Phase
      a b c
(1) ii iii i
(2) i iii ii
(3) iii ii i
(4) iii i ii

Answer (1) ii -a iii-b i-c

73. Match the items given in Column I with those in Column II and select the correct option given below :
Column I                                  Column II
a. Glycosuria                    i. Accumulation of uric acid in joints
b. Gout                            ii. Mass of crystallized salts within the kidney
c. Renal calculi               iii. Inflammation in glomeruli
d. Glomerular                 iv. Presence of nephritis glucose in urine
       a b c d
(1) ii iii i iv
(2) i ii iii iv
(3) iii ii iv i
(4) iv i ii iii

Answer (4) iv -a i-b ii-c iii-d

74. Match the items given in Column I with those in Column II and select the correct option given below:
Column I                             Column II
(Function)               (Part of Excretorysystem)
a. Ultrafiltration               i. Henle's loop
b. Concentration of urine ii. Ureter
c. Transport of urine        iii. Urinary bladder
d. Storage of urine           iv. Malpighian corpuscle

                                           v. Proximal   convoluted tubule
      a b c d
(1) v iv i ii
(2) iv i ii iii
(3) iv v ii iii
(4) v iv i iii

Answer ( 2 ) iv-a i-b ii-c iii-d

75. Which of the following gastric cells indirectly help in erythropoiesis?
(1) Goblet cells
(2) Mucous cells
(3) Chief cells
(4) Parietal cells

Answer(4) Parietal cells

76. Match the items given in Column I with those in Column II and select the correct option given below :
Column I             Column II
a. Fibrinogen  (i) Osmotic balance
b. Globulin     (ii) Blood clotting
c. Albumin     (iii) Defence mechanism

         a b c
(1) (i) (iii) (ii)
(2) (i) (ii) (iii)
(3) (iii) (ii) (i)
(4) (ii) (iii) (i)

Answer (4)

77. Which of the following is an occupational respiratory disorder?
(1) Botulism (2) Silicosis (3) Anthracis (4) Emphysema

Answer (2)Silicosis

78. Calcium is important in skeletal muscle contraction because it
(1) Detaches the myosin head from the actin filament.
(2) Activates the myosin ATPase by binding to it.
(3) Binds to troponin to remove the masking of active sites on actin for myosin.
(4) Prevents the formation of bonds between the myosin cross bridges and the actin
filament.

Answer (3) Binds to troponin to remove the masking of active sites on actin for myosin.

79. Nissl bodies are mainly composed of
(1) Nucleic acids and SER
(2) DNA and RNA
(3) Proteins and lipids
(4) Free ribosomes and RER

Answer (4) Free ribosomes and RER

80. Which of these statements is incorrect?
(1) Glycolysis operates as long as it is supplied with NAD that can pick up
hydrogen atoms
(2) Glycolysis occurs in cytosol
(3) Enzymes of TCA cycle are present in mitochondrial matrix
(4) Oxidative phosphorylation takes place in outer mitochondrial membrane

Answer (4) Oxidative phosphorylation takes place in outer mitochondrial membrane

Read More

2018 NEET Biology Questions (61-70)

61. Which of the following animals does not undergo metamorphosis?
(1) Moth (2) Tunicate (3) Earthworm (4) Starfish

Answer ( 3 )Earthworm 

62. Which of the following organisms are known as chief producers in the oceans?
(1) Cyanobacteria (2) Diatoms (3) Dinoflagellates (4) Euglenoids

Answer ( 2 ) Diatoms 

63. Which one of the following population interactions is widely used in medical science for the production of antibiotics?
(1) Parasitism (2) Mutualism (3) Commensalism (4) Amensalism

Answer ( 4 )Amensalism

64. All of the following are included in ‘ex-situ conservation’ except
(1) Botanical gardens
(2) Sacred groves
(3) Wildlife safari parks
(4) Seed banks

Answer (2) Sacred groves

65. Match the items given in Column I with those in Column II and select the correct option given below :
Column-I                 Column-II
a. Eutrophication i. UV-B radiation
b. Sanitary landfill ii. Deforestation
c. Snow blindness iii. Nutrient enrichment
d. Jhum cultivation iv. Waste disposal
      a b c d
(1) iii iv i ii
(2) i iii iv ii
(3) ii i iii iv
(4) i ii iv iii

Answer ( 1 )

66. In a growing population of a country,
(1) reproductive and pre-reproductive individuals are equal in number.
(2) reproductive individuals are less than the post-reproductive individuals.
(3) pre-reproductive individuals are more than the reproductive individuals.
(4) pre-reproductive individuals are less than the reproductive individuals.

Answer ( 3 )pre-reproductive individuals are more than the reproductive individuals.

67. Which part of poppy plant is used to obtain the drug “Smack”?
(1) Roots (2) Latex (3) Flowers (4) Leaves

Answer ( 2 )Latex

68. All of the following are part of an operon except
(1) an enhancer
(2) structural genes
(3) an operator
(4) a promoter

Answer (1)an enhancer

69. A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
(1) Only grandchildren
(2) Only sons
(3) Only daughters
(4) Both sons and daughters

Answer (4) Both sons and daughters

70. According to Hugo de Vries, the mechanism of evolution is
(1) Phenotypic variations
(2) Saltation
(3) Multiple step mutations
(4) Minor mutations

Answer (2)Saltation

Read More