SANT GYANESHWAR MODEL SCHOOL

HALF YEARLY EXAMINATION

SESSION:2024-25
CLASS- XI ::SUBJECT : BIOLOGY
DATE:- 17/09/24 TIME: 3 hrs. M.M.: 70
NAME:- ROLL NO:- INVIGILATOR SIGN.:-
General Instructions:
 All questions are compulsory.
 The question paper has five sections and 33 questions. All questions are compulsory.
 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 labeled diagrams should be drawn.
Section –A
Q.1.Musca domestica is common name of
(a) Housefly
(b) Mosquito
(c) Snail
(d) Ant
Q.2. The largest petal overlaps the lateral ones in _________ aestivation.
(a) Papilionaceous
(b) Valvate
(c) Twisted
(d) Imbricate
Q.3. In which of the following plants stems do not store the food material
(a) Potato
(b) Ginger
(c) onion
(d) Colocasia
Q.4. Stem develops from
(a) Radicle
(b) Cotyledon
(c) mesocarp
(d) Plumule
Q.5. Closed vascular bundles lacks
(a) Pith
(b) Xylem
(c) cambium
(d) Xylem vessels
Q.6. The term Cell was given by-
(a) Leeuwenhoek
(b) Robert hooke
(c) Flemming
(d) Robert Brown
Q.7. The cells of this region are very small, thin-walled and with dense protoplasm. They divide repeatedly.
(a) Region of meristematic
(b) Region of elongation
(c) Root cap
(d) Region of maturation
Q.8. Apocarpous is the term given to
(a) More than one carpel fused together.
(b) More than one carpel which may be free.
(c) One carpel only
 (d) None
Q.9. Actinomorphic is the term used for flowers with
(a) Bilateral symmetry
(b) Radial symmetry
(c) Irregular
(d) Oval
Q.10. Centromere is a constituent of
(a) Ribosome
(b) ER
(c) Chromosome
(d) Mitochondria
Q.11.What is the expansion of ICBN?
(a) International Code for Botanical Nomenclature
(b) International Code for Biological Naming
(c) Indian Code for Biological Naming
(d) International Council for Biodiversity and Nature
Q.12. Which of the following is absent in female frog?
(a) Webbed feet
(b) Copulatory pads
(c) Tympanum
(d) All are present
For question no. 13 to 16 ,two statements are given – one labeled Assertion (A) and the other labeled
Reason® .Select the correct answer to these questions from the codes (a) , (b) , (c) and (d) as given
below .
a)Both assertion and reason are true , and the reason is the correct explanation of the assertion
b)Both assertion and reason are true , and the reason is not the correct explanation of the assertion .
c)Assertion is true and reason is false .
d)Both assertion and reason is false .
Q.13. Assertion: One of the defining property of living organisms is consciousness.
Reason: Human being is the only organism that has self consciousness.
Q.14. Assertion: Organisms are made up of cells.
Reason: Cells are structural unit of living organisms. A cell keeps its chemical composition steady within
its boundary.
Q.15. Assertion : Both words are separately underlined in binomial nomenclature.
Reason: Underlining indicates their Latin origin.
Q.16. Assertion: Botany deals with the study of plants and zoology deals with the study of animals.
Reason : Biology is the study of living beings.
Section -B
Q.17. Which cell organelle is known as a powerhouse of cells & why?
Q.18. What are nuclear pores? State their functions?
Q.19. Draw a well labelled diagram of T.S. of dicot root.
Q.20.How can a male frog be distinguished from a female frog?
OR
Why mango and coconut are called as drupe ?
Q.21.Why lysosome are called as suicide bag of the cell ?
Section -C
Q.22. Provide the scientific terms for the following:
a) The flat and expanded portion of a leaf.
b) An orderly arrangement of leaves on the node.
c) Lateral appendages on either side the leaf.
Q.23. a) What is the scientific name of frog ?
b)Why frog is considered as a cold blooded animal?
c)What do you mean by ureotelic animal?
Q.24. Draw a well-labeled diagram of T.S. of dicot stem .
OR
Draw a well-labeled diagram of T.S. of dicot leaf .
Q.25. Explain venation and it’s type with example.
Q.26. “Both lysosomes & vacuoles are endomembrane structures yet they differ in terms of their functions”
comment.
Q.27. (a)Who discovered Golgi apparatus?
(b)What is the function of Golgi apparatus?
Q.28. Give an account of the alimentary canal of frogs.
Section –D
Question no. 29 and 30 are case based questions .
Q.29. Plastids are found in all plant cells and in euglenoids. These are easily observed under the microscope
as they are large. They bear some specific pigments, thus imparting specific colours to the plants. Plastids
consist of numerous membrane layers embedded in a material called the stroma. They have their own
genome and ribosomes.
(a) The ________ are the colourless plastids of varied shapes and sizes with stored nutrients.
I. Leucoplasts
II. Chloroplasts
III. Chromoplasts
IV. Carotenoids
(b) The __________ store proteins in grains.
I. Amyloplasts
II. Aleuroplasts
III. Elaioplasts
IV. Carotenoid
(c) Which type of plastid stores carbohydrates in potatoes?
I. Amyloplasts
II. Aleuroplasts
III. Elaioplasts
IV. Carotenoid
(d) The space limited by the inner membrane of the chloroplast is called the ______.
I. Matrix
II. Cytoplasm
III. Stroma
IV. Lumen

Q.30. Roots in some plants change their shape and structure and become modified to perform functions other
than absorption and conduction of water and minerals. They are modified for support, storage of food and
respiration. Tap roots of carrot, turnip and adventitious roots of sweet potato, get swollen and store food.
In some plants such as Rhizophora growing in swampy areas, many roots come out of the ground and
grow vertically upwards. Such roots, called pneumatophores, help to get oxygen for respiration.
I. What is the function of roots.
II. What are adventitious roots?
III. Explain root modification and give any two example of root modification?
IV. What is pneumatophores?
Section -E
Q.31. Describe the family Solanaceae.( Characters, floral formula , economic importance, floral diagram)
OR
(a)Describe the ultrastructure of a cilium or flagellum?
(b)Distinguish between prokaryotic & eukaryotic cells?
Q.32. (a) Mention two similarities & two differences between mitochondria & chloroplasts?
(b) Explain the fluid mosaic model of the plasma membrane.
OR
(a) Differentiate between endarch and exarch conditions.
(b) Draw a well-labeled diagram of T.S. of dicot stem.
Q.33. (a) Expand PPLO.
(b) Why are lysosomes called “suicidal bags”?
(c) What is meant by active transport across a cell membrane?