Karnataka 1st PUC Mid Term Question Paper 2025 Biology

Government of Karnataka
Karnataka Secondary Education Examination Board

Question Papers
Mid Term

TPUCMID-TERM EXAMINATION, OCTOBER- 2025
SUBJECT: BIOLOGY (36)
Time:3 Hours Max. Marks :70
General Instructions:
I. The question paper consists of four parts A, B, C and D.
2. PART-A consists of I & II and Part-D consists of
two parts V and VI
3. All the parts are compulsory.
4. Answers for PART-A, Written in the first two pages of the answer booklets are
for evaluation. only considered

PART-A
Select the correct alternative from the choices given
below: 15x1=15
1) Taxon is
a) group ofrelated species b) any rank in the taxonomic hierarchy
c)basic rank oftaxonomic hierarchy d) category ofrelated species
2) Statement 1-Deuteromycetes are commonly known as
imperfect fungi.
Statement 2- In deuteromycetes both asexual and sexualphases are known
a) Both statements are corect b)Statement 1 is incorrect and statement2is correct
c) Both statement are incorrect d) Statement 1 is correct and statement 2 is incorrect
3) The stage in which sex organs are produced in mosses.
a) Protonema b) Prothallus c) Leafy stage d) both (a) and (c)
4) The association of fungus with roots of higher plants is called
a) mycorrhiza b)adventitious roots c) coralloid roots d) lichens
5) When the mesodermis preset as scattered pouches in between ectoderm and
is said to be
endodermthe condition
a) Pseudocoelom b) coelom c) acoelom d) eucoelom
6) Aschelminthes possesses
a) metaneres on body surface b) water vascular system
c) malphigian tubules ) well defined muscular pharynx
7) Pericarp is
a) inner layer of fruit b) seed coat c) fruit wall d) ovarian chamber
8) Pericycle is present next to
a) cuticle b) endodermis c) epidermis ) pith
9) Statement -1 :In dicot leaf, vascular bundles are surrounded by
cells.
layer ofthick walled bundle sheath
Statement -2:When the bundle sheath cells are turgid the
leafsurface is exposed and when they are
placid, make the leaves curl inwards.
a) Both the statements are true b)Statement l is true and
c) Statement 1 is false and Statement 2 is true d) Both the statements are
Statement 2 is false
10) Statement -1 :In male frogs the ureters false
act as urinogenital duct which opens into
Statement -2: In female frogs the ureters and oviduct cloaca
open separately in the cloaca
a) Statement 1 is right and Statement 2 is wrong
b) Statement 1is wrong and Statement 2 is right
c)Both the statements are wrong
d) Both the statements are right

-2
11) Find the incoIrect statement -
Frogs are beneficial for mankind because
a) they eat insects and protect crop
b) they maintain ecological balance by serving as an important link offood chain and food web
c) they control pollution by purifying water
d) In some countries, the muscular legs of frog are used as food
12) Polysomes are -
a) group ofmitochondria b)chain ofribosomes on mRNA
c) proteins found attached to the cell membrane d) membrane bound vascular structures
13) The correct match is -
a) amyloplast - carbohydrates, elaioplast -oil and fat, aleuroplast - protein
b) amyloplast -protein, elaioplast -carbohydrates, aleuroplast -oil and fat
c) amyloplast - oiland fat,elaioplast -protein, aleuroplast -carbohydrates
d) amyloplast -carbohydrates, elaioplast -protein, aleuroplast -oil and fat
14) Collagen is
a) intercellular ground substance b)fights infectious agents
c) enzyme d) all the above
15) Find the correct match -
a) purines - thymine, cytosine, uracil
pyrimidines-adenine, guanine
b) purines adenine, thymine
pyrimidines - guanine, cytosine, uracil
c)purines - adenine, guanine
pyrimidines - thymine, cytosine, uracil
d) purines - guanine, cytosine, uracil
pyrimidines - adenine, thymine
II Fillin the blanks by choosingtheappropriate word from those given below: 5x1=5
[Phycobiont, systematics, mycobiont, radula, axillary bud, mesosomes]
16) is the branch of biology which deals with different kinds oforganisms, their derivatives
and also realtionship among them.
17) The fungal component ofthe lichens is called
18) is the rasping organ found in the molusca.
19) Leafis characterised by the presence of at its base.
20) are the special structures in bacteria which help in the formation of cell wall, DNA
replication and distribution to daughter cells.
PART-B
Answer any FIVE of the following questions in 3-5 sentences each, wherever applicable:
5x2=10
21) Expand a) ICBN b) ICZN
22) Write the taxonomic categories for wheat in a systematic hierarchical arrangements.
23) Write any four significant impact of heterotrophic bacteria on human affairs.
24) Who discovered viroids ?Mention their composition.
25) Define numerical taxonomy.
26) Tabulate any four differences between chordates and non-chordates.
27) What are open vascular bundles ?Explain the importance of cambium.

-3
PART-C
Answer any FIVE of the following questions in about 40-80 words each, wherever
applicable: 5x3=15
28) Write the characteristic features of euglenoids.
29) Mention the major pigments, stored food and cell wall composition in green algae.
30) Write one example for each ofthe following -
a) cold blooded animal
b) warmblooded animal
c) animal possessing dry and cornified skin.
31) Assign the following to the respective phyla
a) Viper b) Balanoglossus c) Ophiura
32) Write a note on structural diversity and functions of guardcells.
33) Write any three morphological characters offrog.
34) Explain the quaternary structure ofprotein. Give an example.

PART-D
Answer any FOUR of the following questions in about 200-250 words each,wherever
applicable: 4x5-20
35) Write a note with respect to phaeophyceae
a) any two general characters (1)
b) reproduction (3)
c) two examples (1)
36) Write a note on mammals and mention one example for oviparous and viviparous mammals.
37) Draw a neat labelled diagram of T.S. ofdicot stem.
38)Explain the types ofplacentation with one example each.
39) List the floral characters of solanaceae and write the floral fofmula.
40) a) What is the composition of chromatin ? (1)
b) Explain the types of chromosomesbased on the position of centromere. (4)
41) Draw the neat labelled diagrams of
a) mitochondria b) Chloroplast (2+3)
VI Answer any ONE of the following questions in about 200-250 words each, wherever
applicable: lx5=5
42) Explain the structural details of fluid mosaic model ofplasma membrane.
43) Draw aneat labelled diagram ofmale reproductive system of frog.
44) Write any five classes of enzymes and their functions.

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