HBSE Class 11 Sample Paper 2026 Answers Biology

BSEH MARKING SCHEME

CLASS- XI Biology (Model Paper 2025-26) Code: A

 The answer points given in the marking scheme are not final.

These are suggestive and indicative. If the examinee has given

different, but appropriate answers, then he should be given

appropriate marks.

Q. Part Answers Marks Total

No. no. Marks

1. --- c) citrus canker 1 1

2. --- a) % 1 1

3. --- b) Duodenum 1 1

4. --- c) Plasmodesmata 1 1

5. --- c) ricin 1 1

6. --- a) 2 1 1

7. --- b) 12 1 1

8. --- d) TV 1 1

9. --- d) Neutrophils 1 1

10. --- pteridophytes 1 1

11. --- 46 1 1

12. --- When xylem and phloem within a vascular 1 1

bundle are arranged in an alternate manner

1

BSEH Marking Scheme Class: XI Model Paper (2025-26)

along the different radii, the arrangement is

called radial.

13. --- Four 1 1

14. --- Embryonic 1 1

15. --- ABA or Abscisic acid 1 1

16. --- d) A is false but R is true. 1 1

17. --- a) Both A and R are true, and R is the correct 1 1

explanation of A.

18. --- b) Both A and R are true, and R is not the 1 1

correct explanation of A.

19. Similar Taxon: 1 2

Kingdom-Plantae /

Division-Angiospermae

Different Taxon: ½+½

Species- indica and aestivum/

Genus- Mangifera and Triticum /

Family- Anacardiaceae and Poaceae /

Order – Sapindales and Poales/

Class – Dicotyledonae and Monocotyledonae

Or Or

Felis and Panthera

2

2
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

20. Virus: DNA/RNA and Protein 1 2

Viroid: Only RNA ½

Prions: Only protein ½

21. Number of bones: 22 1
2
Fibrous Joints 1

22. Cutaneous Respiration – Skin ½+½
2
Pulmonary Respiration – Lungs ½+½

23. When stamens are attached to the petals, they 1

are epipetalous.

When stamens are attached to perianth, they 1

are epiphyllous.

Or Or 2

1. Veins provide rigidity to the leaf blade 1

2. Veins act as channels of transport for 1

water, minerals, and food materials.

24. 1. When the bulliform cells in the leaves 1

have absorbed water and are turgid, the

leaf surface is exposed.
2
2. When they are flaccid due to water 1

stress, they make the leaves curl inwards

to minimise water loss.

3
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

25. Oils: Elaioplasts 1

Proteins: Aleuroplasts 1

Or 2

erythrocytes of many mammals 1

sieve tube cells of vascular plants 1

26. Notochord: Absent ½

Segmentation: Absent ½

Coelom: True coelom/present ½
3
Level of organisation: Organ-system level ½

Symmetry: Bilateral ½

Type of development: Indirect ½

27. i) Chondrichthyes / Cartilaginous fish 1

ii) Aves/ Birds 1 3

iii) Arthropoda 1

28. i. Renal calculi: Stone or insoluble mass of ½+½

crystallised salts formed within the kidney

ii. Glomerulonephritis: Inflammation of ½+½

glomeruli of kidney.
3
iii. Uremia: Malfunctioning of kidneys can ½+½

lead to accumulation of urea in blood

Or

i. Ammonotelic: bony fishes/ ½+½

4
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

aquatic amphibians/ aquatic insects

ii. Ureotelic: Mammals/ ½+½

terrestrial amphibians/ marine fishes

iii. Uricotelic: Reptiles/ birds/ land snails ½+½

29. Feature C 3 Plants C 4 Plants

photorespiration Yes No 1

optimum 1
20-25 0 C 30-40 0 C
temperature
3
Phospho 1

primary CO2 glyceric Oxalo acetic

fixation product acid acid (OAA)

(PGA)

30. i. Green algae: Photosynthesis/ food 1

supplements

ii. Brown algae: Hydrocolloids like algin 1

iii. Red algae: Carrageen/ Agar as 1

hydrocolloids
3
Or

The first stage of gametophyte is the

protonema stage.
½+½
It develops directly from a spore.

5
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

The second stage is the leafy stage, which

develops from the secondary protonema.

½+½
Sex organs antheridia and archegonia are

produced at the apex of the leafy shoots.

After fertilisation, the zygote develops into a

sporophyte, consisting of a foot, seta and

capsule.

½+½
The capsule contains spores which give rise to

gametophyte.

31. i) 20 1

ii) Insulin 1

Or

Enables glucose transport into cells
4
iii) Ribulose bisphosphate Carboxylase- 1

Oxygenase (RuBisCO)

iv) Because proteins has 20 different type of 1

monomers repeating ‘n’ number of times.

32. i) inner parts of cerebral hemispheres 1

amygdala ½
4
hippocampus ½

ii) dura mater 1

6
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

iii) Cerebrum 1

Or

Mid brain

33. gastrin ½

secretin ½

cholecystokinin (CCK) ½

gastric inhibitory peptide (GIP) ½

i) Gastrin acts on the gastric glands and

stimulates the secretion of hydrochloric acid

and pepsinogen.

ii) Secretin acts on the exocrine pancreas and Any

stimulates secretion of water and bicarbonate three (1

ions. mark 5

iii) CCK acts on both pancreas and gall each)

bladder and stimulates the secretion of

pancreatic enzymes and bile juice,

respectively.

iv) GIP inhibits gastric secretion and motility.

Or

i) Thyroxine, Thyroid gland ½+½

ii) Insulin, Pancreas ½+½

iii) Anti-diuretic hormone (ADH), Pituitary Gland ½+½

7
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

iv) Growth hormone, Pituitary Gland ½+½

v) Adrenaline, Adrenal gland ½+½

34. ½ mark

for

each

correct

step

5

Or

i. Pyruvate + CoA + NAD+  1

Acetyl Co A + NADH + H++ CO2

ii. Citric Acid + NAD+  1

α-ketoglutaric acid+ NADH + H++ CO2

iii. α-ketoglutaric acid+GDP + NAD+  1

Succinic acid+GTP + NADH + H++ CO2

8
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

iv. Succinic Acid + FAD+  1

Malic acid+ FADH2

v. Malic Acid + NAD+  1

Oxaloacetic acid+ NADH + H+

35. 2½

5
G1 Phase: the cell is metabolically active and ½

continuously grows but does not replicate its

DNA

S Phase: S or synthesis phase marks the period ½

during which DNA synthesis or replication

takes place.

G2 Phase: During the G2 phase, proteins are ½

synthesised in preparation for mitosis while

cell growth continues.

9
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

M Phase: The M Phase represents the phase ½

when the actual cell division or mitosis occurs.

G0 Phase: cells that do not divide further exit ½

G1 phase to enter an inactive stage called

quiescent stage of the cell cycle. Cells in this

stage remain metabolically active but no

longer proliferate

Or

i. Leptotene: ½+½

the chromosomes become gradually visible

under the light microscope and compaction of

chromosomes continues throughout it.

ii. Zygotene: ½+½

During this stage chromosomes start pairing

together and this process of association is

called synapsis.

iii. Pachytene: ½+½

During this stage, the four chromatids of each

bivalent chromosomes becomes distinct and

clearly appears as tetrads and this stage is

characterised by the appearance of

recombination nodules, the sites at which

10
Biology Code: A

BSEH Marking Scheme Class: XI Model Paper (2025-26)

crossing over occurs between non-sister

chromatids of the homologous chromosomes.

iv. Diplotene: ½+½

It is recognised by the dissolution of the

synaptonemal complex and the tendency of

the recombined homologous chromosomes of

the bivalents to separate from each other

except at the sites of crossovers.

v. Diakinesis: ½+½

During this phase the chromosomes are fully

condensed and the meiotic spindle is

assembled to prepare the homologous

chromosomes for separation.

11
Biology Code: A