Class 11 Sample Paper 2025 Biology (Mid Term)

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Mid Term Sample Paper 2025-26
-- AGLASEM --

Practice Paper
Session :2025-26
Class – XI
Biology (Code: 044)

Time: 3 hours Maximum Marks: 70

General Instructions :
Read the following instructions very carefully and strictly follow them: -
• All questions are compulsory.
• The question paper has five sections and 33 questions.
• Section–A has 16 questions of 1 mark each.

Section–B has 5 questions of 2 marks each.
Section–C has 7 questions of 3 marks each.
Section–D has 2 case-based questions of 4 marks each and
Section–E has 3 questions of 5 marks each.
There is no overall choice. However, internal choices have been provided in some questions. A student has to
attempt only one of the alternatives in such questions.
Wherever necessary, neat and properly labelled diagrams should be drawn.

Section – A
Q. No. 1 to 12 are multiple choice questions. Only one of the choices is correct. Select and write the
correct choice as well as the answer to these questions.
Q. Question Marks
No

1 Which on of the following belongs to family Anarcardiacea? 1
a) Apple b) Mango c) Grapes d) Banana

2 The number of species that are known and described range between ___________, it refers to 1
biodiversity.
a) 1.7-1.8 b) 1.7-1.9 c) 1.7-1.11 d) 1.7-1.10

3 Marshy bacteria are known as 1
a) Halophiles b) Thermoacidophiles c) Methanogens d) Photosynthetic

4 Green plants had a ____________ cell wall. 1
a) Cellulosic b) Chitin c) Pectin d) Pellicle

5 Complete the following table:
Classes Common Name Major Pigments Stored Food 1
Chlorophyceae A B Starch
C Brown algae Chlorophyll a,c, D
fucoxanthin
Rhodophyceae Red algae E F
A B C D E F
a)

Blue algae Carotenoids Chlorophyceae Glycogen Laminarin Xanthophyll
Mannitol, Chlorophyll a,d,
b) Green algae Chlorophyll a,b Phaeophyceae laminarin phycoerythrin Floridean starch
c) Red algae Chlorophyceae Rhodophyceae Glucose Xanthophyll Starch
d) Brown algae Rhodophyceae Algae Floridean Mannitol Laminarin

Q. Question Marks
No

6 In moss, the capsule helps in : 1
a) Gamete formation b) Spore dispersal c) Fertilization d) Photosynthesis

7 Which animal shows metameric segmentation ? 1
a) Earthworm b) Roundworm c) Snail d) Hydra

8 The arrangement of sepals and petals in floral bud is called :
a) Placentation b) Vernation c) Aestivation d) Phyllotaxy 1

9 Bulliform cells are typically found in
a) Dicot stem b) Monocot root c) Monocot leaf d) Dicot leaf 1

10 Tympanum in frog helps in
a) Respiration b) Hearing c) Excretion d) Digestion 1

11 Which of this is not a distinguishing feature of a male frog ?
a) Narrow abdomen b) Copulatory pad c) Vocal sacs d) Moist ,slippery skin 1

12 Which component of the endomembrane system is responsible for the synthesis of steroidal 1
hormones ?
a) Golgi apparatus
b) Rough Endoplasmic Reticulum
c) Smooth Endoplasmic Reticulum
d) Lysosomes

For Question numbers 13 to 16, two statements are given- one labelled as Assertion (A) and the
other labelled as Reason (R). Answer these questions by selecting the appropriate option given
below:

a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
c) (A) is true, but (R) is False.
d) (B) is false, but (R) is true.

13 Assertion (A): Taxonomic hierarchy includes kingdom, phylum, class, order, family, genus and 1
species.
Reason (R): Each higher category represents a group of organisms with fewer similarities than
those in the lower category.

14 Assertion(A): Aves are the only animals with feathers and bipedal locomotion. 1

Reason (R): Presence of pneumatic bones and air sacs help in efficient respiration during flight.

15 Assertion (A): Trichomes present on the stem may help in reducing water loss. 1

Reason (R) : They reflect sunlight and trap a layer of still air.

16 Assertion (A): The endoplasmic reticulum (ER) helps in both protein and lipid synthesis. 1
Reason (R): Rough ER is associated with ribosomes for protein synthesis, while Smooth ER
synthesizes lipids.

Section – B
Q. Question Marks
No

17 Define nomenclature. Who proposed binomial nomenclature? 2
OR
In taxonomic categories the category family how it is characterized?

18 Draw a labelled diagram of a moss plant (Funaria) showing gametophyte and sporophyte.
OR 2

Show with a diagram the structure of Marchantia thallus with gemma cups.

19 Explain why Chondrichthyes have to swim constantly whereas Osteichthyes not. 2

20 What is called stomatal apparatus? 2

21 How does cutaneous and pulmonary respiration takes place in frog? 2

Section – C
Q. Question Marks
No

22 Describe three modes of nutrition found in Eubacteria with examples. 3

23 Explain the symbiotic associations in Lichens and also name the algal component and fungal 3
component in lichens.

24 i) Differentiate between urochordates and cephalochordates (any two points) 3
ii) State two economic importance of Arthropoda.

i) Identify (a), (b), (c) and (d) the position of floral parts on thalamus.
25 3
ii) State when ovary is said to be superior and inferior.

26 Draw a T.S. of monocot leaf and label bulliform cells. 3

OR

Draw a T.S. of dicot leaf and label upper epidermis, palisade mesophyll, spongy mesophyll, and
vascular bundle.

Q. Question Marks
No

27 Write three salient features of the frog’s circulatory system. 3

28 Match the Column A with Column B: 3

COLUMN A COLUMN B
1. Mitochondria a) Protein synthesis
2. Ribosomes b) Photosynthesis
3. Chloroplast c) ATP generation
4. Lysosome d) Intracellular digestion
5. Robert Hooke e) Cell theory
6. Schleiden and Schwann f) Discovered cell cork

Section – D
Questions Nos 29 and 30 are case-based questions. Each question has sub questions with internal choice in one
sub-question.
Q. Question Marks
No

29 Read the following passage and answer the questions that follows: -
“The heart of frog is the three chambered, consisting of two auricles and one ventricle. The heart 4
is covered by a membrane called pericardium. A triangular structure called sinus venous joins the
right atrium. Blood from the body enters the right atrium and blood from lungs enters the left
atrium. Both the atria pour blood into the single ventricle where mixing of oxygenated and
deoxygenated blood takes place. The ventricle pumps blood into the conus arteriosus, which
carries it to different body parts.”

A) How does sinus venosus receives blood?
B) Write down the function of veins.
OR
Write down the function of arteries.
C) What is called hepatic portal system and renal portal system?

30 Study the sectional view of chloroplast given below and answer the question based on the 4
sectional view:

A) In the diagram of chloroplast, why are thylakoids stacked into grana?
B) How does the structure of chloroplast support its function in photosynthesis?
C) Compare the functions of grana and stroma based on their locations in the diagram.
D) Name the fat soluble pigments in the chloroplasts.
OR
Which part contains circular DNA and 70S ribosomes?

Section – E
Q. Question Marks
No

31
I. Describe the features of the male gametophyte in Pinus.
II. Mention two adaptive features of gymnosperms to survive in cold conditions. 5

OR

I. Differentiate between microphylls and megaphylls with examples.
II. Explain the two stages in moss.
III. Name the alga that is used as food supplement by the space travellers.

32
i) Name the excretory organ of the following phylum:
5
a) Platyhelminthes b) Annelida c) Arthropoda

ii) Write the important role played by radula.
iii) Write down the unique mammalian characteristic.

OR

Compare Annelida, Arthropoda, and Mollusca with respect to body organization.

33 Describe secondary growth in dicot stems with the help of a diagram. 5
OR

Explain the Vascular Tissue System supported by diagrams.

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Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
Half Yearly Sample Papers Class 8 Notes

Class 9 Notes
Important Resources
Class 10 Notes
Periodic Table
Class 11 Notes
Writing Skills / Formats

Maps of India / World Class 12 Notes

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