Class 12 Biology notes and question bank — NEB Exam
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Explore Class 12 Biology past and model questions by chapter, year, marks and question type.

178 questions found

1
Short2+2Old Question · 2083Solution available

Discuss the advantages and disadvantages of organ transplantation.

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2
Long1+2+2+2+1Old Question · 2083Solution available

Candidiasis also known as moniliasis is an infection which affects immune compromised people. Describe its causative agent, modes of transmission, symptoms and preventive measures. Why is candidiasis common in diabetic patients?

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3
ShortOld Question · 2083Solution available

Identify the given figure and name the parts labeled by A and B.

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4
ShortOld Question · 2083Solution available

A plant species has chromosomes. A mutant plant is found to have chromosomes. Identify the type of chromosomal mutation and, on this basis, differentiate between aneuploidy and euploidy.

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5
ShortOld Question · 2083Solution available

Describe the internal structure of a monocot root with diagrammatic figure.

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6
ShortOld Question · 2083Solution available

Why is part B called mixed gland?

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7
Long1.5+3+3.5Old Question · 2083Solution available

Adrenal glands also known as suprarenals are located above the kidneys and have outer cortex and inner medulla region. Name the different groups of hormones secreted by the different regions of adrenal cortex. Mention specific functions of each. Describe the disorders of hormones secreted by adrenal cortex.

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8
MCQOld Question · 2083Solution available

Which of the following are psychotropic drugs?

A

Opiates

B

Antihistamines

C

Mescaline

D

Bhang

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9
MCQOld Question · 2083Solution available

What is called the process in which the shrinkage of protoplasm of fresh plant cell kept in hypertonic solution?

A

Deplasmolysis

B

Endosmosis

C

Imbibition

D

Plasmolysis

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10
MCQOld Question · 2083Solution available

What is the specific term used for the part of the plant that provides the root system?

A

Propagule

B

Stock

C

Callus

D

Scion

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11
MCQOld Question · 2083Solution available

Tendons connect muscles to bones. Why are they less elastic in nature?

A

They contain more elastin fibres

B

They contain more collagen fibres

C

They contain less collagen fibres

D

They contain more reticular fibres

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12
MCQOld Question · 2083Solution available

Which of the following describes the transmission of an X-linked trait from a father to his grandson through his normal carrier daughter?

A

Co-dominance

B

Maternal inheritance

C

Y-Linked inheritance

D

Criss-cross inheritance

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13
ShortOld Question · 2083Solution available

Label the parts A and B.

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14
MCQOld Question · 2083Solution available

A gardener removes the apical bud of a coffee plant to promote lateral branching. Which hormonal change best explains this effect?

A

Reduced auxins allows lateral buds to grow

B

Increased gibberellin causes stem elongation

C

Increased auxin induces dormancy

D

Increased auxins stimulates lateral buds

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15
MCQOld Question · 2083Solution available

Which of the following tissue of a leaf helps in photosynthesis?

A

Aerenchyma

B

Xylem

C

Mesophyll

D

Sclerenchyma

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16
MCQOld Question · 2083Solution available

Which vaccine is prepared using DNA-recombinant technology and contains only a specific antigen, reducing adverse reactions?

A

BCG

B

OPV

C

Hepatitis B

D

Rabies

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17
MCQOld Question · 2083Solution available

A 17-year old student can read books comfortably but cannot clearly see the letters on black or white board. What could be the defect and its cause?

A

Hypermetropia due to short eyeball

B

Myopia due to increased focal length

C

Myopia due to elongated eyeball

D

Presbyopia due to weak ciliary muscles

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18
MCQOld Question · 2083Solution available

Coronary sinus collects deoxygenated blood from myocardium (muscles) of heart. It drains blood into which chamber?

A

Left atrium

B

Right atrium

C

Left ventricle

D

Right ventricle

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19
MCQOld Question · 2083Solution available

What is the space between the somatic and visceral layer of mesoderm called in the embryonic development of frog?

A

Blastocoel

B

Archenteron

C

Coelom

D

Neurocoel

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20
ShortOld Question · 2083Solution available

What is the function of part A and C?

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