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The dataset generation failed because of a cast error
Error code:   DatasetGenerationCastError
Exception:    DatasetGenerationCastError
Message:      An error occurred while generating the dataset

All the data files must have the same columns, but at some point there are 2 new columns ({'section', 'answer'}) and 2 missing columns ({'correct_answer', 'type'}).

This happened while the json dataset builder was generating data using

hf://datasets/A2coder75/QnA_All/answer_key.json (at revision 7b781a09291976d65890a20d590c6c077bd11c04)

Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1831, in _prepare_split_single
                  writer.write_table(table)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/arrow_writer.py", line 644, in write_table
                  pa_table = table_cast(pa_table, self._schema)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/table.py", line 2272, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/table.py", line 2218, in cast_table_to_schema
                  raise CastError(
              datasets.table.CastError: Couldn't cast
              section: string
              question_number: string
              answer: string
              marks: int64
              -- schema metadata --
              pandas: '{"index_columns": [], "column_indexes": [], "columns": [{"name":' + 574
              to
              {'question_number': Value('string'), 'type': Value('string'), 'marks': Value('int64'), 'correct_answer': Value('string')}
              because column names don't match
              
              During handling of the above exception, another exception occurred:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1456, in compute_config_parquet_and_info_response
                  parquet_operations = convert_to_parquet(builder)
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1055, in convert_to_parquet
                  builder.download_and_prepare(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 894, in download_and_prepare
                  self._download_and_prepare(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 970, in _download_and_prepare
                  self._prepare_split(split_generator, **prepare_split_kwargs)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1702, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1833, in _prepare_split_single
                  raise DatasetGenerationCastError.from_cast_error(
              datasets.exceptions.DatasetGenerationCastError: An error occurred while generating the dataset
              
              All the data files must have the same columns, but at some point there are 2 new columns ({'section', 'answer'}) and 2 missing columns ({'correct_answer', 'type'}).
              
              This happened while the json dataset builder was generating data using
              
              hf://datasets/A2coder75/QnA_All/answer_key.json (at revision 7b781a09291976d65890a20d590c6c077bd11c04)
              
              Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)

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question_number
string
type
string
marks
int64
correct_answer
string
1(i)
mcq
1
c
1(ii)
mcq
1
a
1(iii)
mcq
1
d
1(iv)
mcq
1
b
1(v)
mcq
1
b
1(vi)
mcq
1
b
1(vii)
mcq
1
b
1(viii)
mcq
1
a
1(ix)
mcq
1
a
1(x)
mcq
1
c
1(xi)
mcq
1
d
1(xii)
mcq
1
c
1(xiii)
mcq
1
a
1(xiv)
mcq
1
d
1(xv)
mcq
1
c
2(i)(a)
short answer
1
Lysozyme
2(i)(b)
short answer
1
Tomato (plant with trichomes)
2(i)(c)
short answer
1
Glycosuria
2(i)(d)
short answer
1
Histone
2(i)(e)
short answer
1
Grana (thylakoid membranes)
2(ii)(a)
fill in the blank
1
Thromboplastin
2(ii)(b)
fill in the blank
1
Calcium (Ca²⁺)
2(ii)(c)
fill in the blank
1
Thrombin
2(ii)(d)
fill in the blank
1
Vitamin K
2(ii)(e)
fill in the blank
1
Fibrinogen
2(iii)(a)
reorder
1
Conjunctiva → Cornea → Lens → Vitreous humour
2(iii)(b)
reorder
1
Menstrual phase → Follicular phase → Ovulatory phase → Luteal phase
2(iii)(c)
reorder
1
Sperm → Sperm duct → Urethra → Vagina
2(iii)(d)
reorder
1
Grass → Insect → Frog → Snake
2(iii)(e)
reorder
1
Nucleus → Chromatin fibre → Nucleosome → DNA
2(iv)(a)
short answer
1
Middle lamella (rich in pectin; hydrophilic)
2(iv)(b)
short answer
1
Choroid (pigmented layer)
2(iv)(c)
short answer
1
Adrenal cortex (zona glomerulosa)
2(iv)(d)
short answer
1
Chromatid
2(iv)(e)
short answer
1
Hepatic portal vein
2(v)(a)
match the following
1
(a) → 4 (Semicircular canals: maintains dynamic balance)
2(v)(b)
match the following
1
(b) → 2 (Eustachian tube: equalizes air pressure)
2(v)(c)
match the following
1
(c) → 5 (Ear ossicles: vibrate and pass on vibrations)
2(v)(d)
match the following
1
(d) → 3 (Tympanum/eardrum: converts sound waves to vibrations)
2(v)(e)
match the following
1
(e) → 6 (Auditory canal: carries sound waves to tympanum)
3(i)
short answer
1
Aqueous humour
3(ii)
short answer
2
Tap water is hypotonic to marine fish body fluids; by endosmosis water enters the cells, causing swelling and possible bursting.
3(iii)
short answer
2
50% Heterozygous Tongue Roller (Rr) and 50% Non-Tongue Rollers (rr).
3(iv)
short answer
2
ACTH is tropic because it acts on another endocrine gland—the adrenal cortex—to stimulate secretion of corticosteroids.
3(v)(a)
diagram-based
1
C: Cortex; J: Stele (vascular cylinder)
3(v)(b)
diagram-based
2
F is Phloem: living tissue with sieve tubes and companion cells; translocates food bidirectionally.
4(i)
short answer
1
Photosynthesis is the process by which green plants use light energy and chlorophyll to synthesize glucose from CO₂ and water, releasing O₂.
4(ii)
short answer
2
SAN: wall of right atrium near opening of superior vena cava; Cuticle: waxy layer over the epidermis of leaves/stems.
4(iii)
short answer
2
Embryo: early developmental stage up to ~8 weeks; Foetus: later stage after ~8 weeks with recognizable organs/features.
4(iv)
short answer
2
Colour blindness is X‑linked recessive; males (XY) express it with one mutant allele, females require two mutant alleles.
4(v)
diagram
3
Neat labelled L.S. of Malpighian capsule (Bowman’s capsule, glomerulus, afferent/efferent arteriole, PCT).
5(i)
short answer
1
0% (a girl would need two mutant X alleles; mother is normal).
5(ii)
short answer
2
Boiling in water kills cells and makes membranes permeable for decolourization; Variegated plant example: Coleus.
5(iii)
short answer
2
Law of Segregation: the two alleles of a gene separate during gamete formation; each gamete receives only one allele; segregation is random and alleles recombine at fertilization.
5(iv)
short answer
2
Root hairs provide large surface area and thin permeable walls with high osmotic concentration for water absorption.
5(v)(a)
diagram-based
1
Plumule shows positive phototropism (towards light); radicle shows negative phototropism and positive geotropism.
5(v)(b)
short answer
1
Tropic movement is directional growth in response to an external stimulus.
5(v)(c)
short answer
1
Imbibition (water absorption/osmosis) and respiration enable germination.
6(i)
short answer
1
Bleeding: exudation of xylem sap from a cut stem due to root pressure.
6(ii)
short answer
2
Pituitary lies in the sella turcica, attached to the hypothalamus; Posterior lobe secretes ADH (vasopressin) and Oxytocin.
6(iii)
short answer
2
Prophase/Prometaphase of mitosis (nuclear membrane disappears, centrioles move to poles); the next stage is Metaphase.
6(iv)
diagram
2
Neat labelled diagram of Prophase (chromosomes condensing, spindle formation, centriole migration).
6(v)(a)
short answer
1
F₁ phenotype: Tall with Green pods (TtGg).
6(v)(b)
short answer
1
F₂ gametes form in equal proportions: TG, Tg, tG, tg (each 1/4).
6(v)(c)
short answer
1
Dihybrid ratio 9 Tall Green : 3 Tall Yellow : 3 Dwarf Green : 1 Dwarf Yellow.
7(i)
short answer
1
Cobalt chloride paper.
7(ii)
diagram-based
2
Process: Crossing over (recombination) during Prophase I; Significance: creates genetic variation/linkage mapping.
7(iii)
short answer
2
Group O RBCs have neither A nor B antigens, so donor cells do not agglutinate with recipient antibodies (universal donor as packed cells).
7(iv)
short answer
2
Saline is hypertonic; it draws water out of swollen tissues and microbes by exosmosis, reducing inflammation and microbial load.
7(v)
diagram
3
Neat labelled diagram of a turgid root hair cell (cell wall, cell membrane, vacuole with cell sap, nucleus, cytoplasm).
8(i)
short answer
1
High humidity decreases the rate of transpiration.
8(ii)(a)
diagram-based
1
Label ‘1’: Cell wall.
8(ii)(b)
diagram-based
1
Cell ‘P’ was in hypotonic solution; to restore ‘S’ (plasmolysed) place it in hypotonic/distilled water for deplasmolysis.
8(iii)
short answer
2
Hydathodes. Below the ring (girdling), tissues shrink because phloem removal stops downward translocation of food, starving tissues.
8(iv)
short answer
2
Transpiration pull, Cohesion of water molecules, Adhesion to xylem walls (capillarity), Root pressure.
8(v)(a)
short answer
1
Potassium hydroxide (KOH) absorbs CO₂.
8(v)(b)
short answer
2
Experimental leaf (without CO₂) does not turn blue‑black with iodine; control leaf turns blue‑black due to starch.
1(i)
mcq
1
b
1(ii)
mcq
1
a
1(iii)
mcq
1
c
1(iv)
mcq
1
a
1(v)
mcq
1
b
1(vi)
mcq
1
c
1(vii)
mcq
1
d
1(viii)
mcq
1
b
1(ix)
mcq
1
a
1(x)
mcq
1
a
1(xi)
mcq
1
b
1(xii)
mcq
1
a
1(xiii)
mcq
1
c
1(xiv)
mcq
1
d
1(xv)
mcq
1
a
2(i)(a)
long answer
2
C¹⁴ is a radioisotope. Used for carbon dating.
2(i)(b)
long answer
1
Class II lever.
2(ii)(a)
long answer
1
Centripetal
2(ii)(b)
long answer
1
zero
2(iii)
numerical
2
30 N
2(iv)(a)
long answer
1
Mechanical advantage using a block and tackle system of 9 pulleys is 9 whereas the mechanical advantage of a single moveable pulley is 2.
2(iv)(b)
long answer
1
Increase of number of pulley increases mechanical advantage.
2(v)
numerical
2
4:1
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