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

61
MCQOld Question · 2082Solution available

Which of the following structures in a plant is primarily responsible for regulating transpiration?

A

Xylem

B

Stomata

C

Root hairs

D

Phloem

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62
Short2+2Old Question · 2081Solution available

Explain the basic steps involved in IVF. Mention any two potential risks or complications associated with IVF.

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63
Short1+3Old Question · 2081Solution available

In which cross, the genotypic and phenotypic ratio are same? Explain it with reference to Mirabilis jalapa.

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64
Short4mOld Question · 2081Solution available

Apply your understanding of various processes involved in the ascent of sap in cohesion tension theory for the maximum uptake of water in plants.

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65
MCQOld Question · 2081Solution available

What is the substance sampled during amniocentesis?

A

Placental cells

B

Amniotic fluid

C

Maternal blood

D

Umbilical cord tissue

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66
Short4mOld Question · 2081Solution available

How do organic fertilizers contribute to sustainable agricultural practices compared to chemical fertilizers, and why is prioritizing their use advantageous?

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67
MCQOld Question · 2081Solution available

Show the correct path for the flow of urine.

A

Renal pelvis, ureter, urinary bladder, urethra

B

Renal pelvis, ureter, urethra, urinary bladder

C

Renal pelvis, urinary bladder, urethra, ureter

D

Renal pelvis, urethra, ureter, urinary bladder

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68
MCQOld Question · 2081Solution available

If the person has puffy appearance, moon face, low body temperature and has intolerance to cold, what do you think he is suffering from?

A

Grave's disease

B

Conn's disease

C

Myxoedema

D

Hashimoto's disease

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69
Short1mOld Question · 2081Solution available

Label the parts C and D

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70
MCQOld Question · 2081Solution available

Which is the correct sequence in embryonic development of frog?

A

Morula, blastula, gastrula

B

Blastula, morula, gastrula

C

Morula, gastrula, blastula

D

Blastula, gastrula, morula

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71
Short1mOld Question · 2081Solution available

What is the figure about, and why is it important?

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72
MCQOld Question · 2081Solution available

Which of the following epithelium forms the inner lining of vagina?

A

Columnar

B

Cuboidal

C

Stratified keratinized squamous

D

Stratified non-keratinized squamous

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73
Long2+5+1Old Question · 2081Solution available

Human alimentary canal is a complete tube designed for ingestion, digestion, absorption, assimilation and egestion process. Draw a labelled diagram of human digestive system and explain the parts of alimentary canal. What would happen if the bile duct becomes blocked?

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74
Long2+5+1Old Question · 2081Solution available

Human ear is concerned with hearing and equilibrium. With the help of a labelled diagram, explain the structure of human ear. What would happen if the opening of Eustachian tube becomes blocked?

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75
Short3+1Old Question · 2081Solution available

Draw a labelled diagram of T.S. of a typical dicot stem and mention any two anatomical characteristics of its vascular bundles.

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76
MCQOld Question · 2081Solution available

What is the primary function of the cambium in perennial dicot vascular plants?

A

To produce lateral roots

B

To provide structural support

C

To produce new xylem and phloem

D

To regulate transpiration

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77
Short1mOld Question · 2081Solution available

Label the parts marked as A and B.

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78
MCQOld Question · 2081Solution available

Which of the following genotypes represents monosomy, a type of aneuploidy?

A

B

C

D

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79
MCQOld Question · 2081Solution available

What causes cell elongation in the internodal regions of plants?

A

Indole acetic acid

B

Gibberellins

C

Abscisic acid

D

Cytokinins

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80
Short2mOld Question · 2081Solution available

Mention the function of part C.

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