ODISHA ADARSHA VIDYALAYA SANGATHAN

HALF YEARLY EXAMINATION, 2024-25

General Instructions:
(i) All questions are compulsory.
(ii) The question paper has five sections and 33 questions. All questions are compulsory.
(iii) 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.
(iv) 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.
(v) Wherever necessary, neat and properly labelled diagrams should be drawn.
SECTION-A
1. Smallest taxon of classification........... 1
(a)Kingdom
(b) variety
(c) Family
(d) Species
2. Bentham and Hooker gave which system of classification................... 1
(a) Numerical
(b) Phylogenetic
(c) Artificial
(d) Natural
3. A plant that has seeds but no flower.............. 1
(a) Bryophytes
(b) Gymnosperms
(c) Mosses
(d) Pteridophytes
4. Which one is not an exception in angiospermae 1
(a) Double fertilization
(b) Secondary growth
(c) Presence of vessels
(d) Autotrophic nutrition
5. Which class has the largest number of animals 1
(a) Fishes
(b) Reptiles
(c) Insects
(d) Mammals
6. Flame cells are excretory structure of .............. 1
(a) Platyhelminthes
(b) Annelida
(c) Coelenterata
(d) Echinodermata

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7. Replum is found in the ovary of ....................... 1
(a) Brassicaceae
(b) Malvaceae
(c) Liliaceae
(d) Asteraceae
8. The defining characteristic of living beings is............. 1
(a) They reproduce
(b) They can digest their food
(c) They respond to external stimuli
(d) They regenerate
9. Which of the following are not membrane bound........................ 1
(a) Ribosomes
(b) Mesosomes
(c) Vacuoles
(d) Lysosomes
10. Ribosomal RNA is actively synthesised in ....................... 1
(a) Ribosomes
(b) Nucleolus
(c) Nucleoplasm
(d) Lysosomes

11. The two subunit of ribosome remain united at a critical ion level of ............................. 1
(a) Calcium
(b) Manganese
(c) Magnesium
(d) Copper
12. Which one of the following is not a constituent of cell membrane........................ 1
(a) Cholesterol
(b) Phospholipid
(c) Glycolipid
(d) Proline
Question No. 13 to 16 consist of two statements – Assertion (A) and Reason (R).
Answer these questions 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 and R is not the correct explanation of A.
C. A is true but R is false.
D. A is False but R is true.
13. Assertion (A): Eukaryotic cells have more DNA than Prokaryotes 1
Reason (R): Eukaryotes are more complex than prokaryotes
14. Assertion (A): Ribosomes are non membrane bound organelles found in the 1
prokaryoptic cells only
Reason (R): They are present only in the cytoplasm
15. Assertion (A): Apical meristem of root is subterminal 1
Reason (R): At the terminal end of root root cap is present.
16. Assertion (A): Roots do not possess node , leaf or bud 1
Reason (R):Root branches arise endogenously.

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 SECTION-B
17. Differentiate between Chordates and Non chordates organism? 2
Or
Write the features of parasitic platyhelminthes?
18. What is stomatal apparatus? Explain the structure of stomata with a labelled diagram. 2
Or
Write the peculiarities of trochome.
19. Both carrot and ginger grow underground, but are still different from each other. Give 2
reasons in support of this statement.
20. What are nuclear pores? State their function. 2
21. Who gave 5 kingdom system of classification and in which year. 2
Or
Why Mycoplasm are so unique in themselves.
SECTION-C
22. Write a note on (i) insectivorous plants and (ii) parasitic plants 3
23. Write about the role of Lysosome in metabolism. 3
24. Write a note on economic importance of algae. 3
25. Name the animal kingdom that possesses largest number of species and State two features 3
of it.
26. Draw the labelled diagram of the following (i) gram seed (ii) V.S of maize seed 3
27. Define phyllotaxy. Mention its types with example.
28. Write a note on archaebacteria. (define, types) two lines each.
SECTION- D
29. Bacteria are grouped under four categories based on their shape. Name them and draw their 4
diagram.
Or
What are plasmids? Mention two features and one importance of it.
30 Alisha grew a potato plant in her kitchen garden. Help her in describing the flower with its 4
technical terms.
Or
Draw the floral formula and floral diagram of Solanaceae family.
SECTION-E
31 (a) What is a centromere? (b) How does the position of centromere form the basis of 5
classification of chromosomes? (c) Support your answer with a diagram showing position of
centromere on different types of chromosomes.
Or
(c) What is the composition of chromatin?
32 (a) Name two organelles that are double membrane bound. (b) What are the characteristics 5
of these two organelles? (c) State their function and draw labelled diagrams of both.
Or
(c) Name the organelles that constitute the endomembrane system.
33 (a) Describe the various types of placentation found in flowering plants. (b) What type of 5
placentarion is found in chinarose ?
Or
(b) Define true fruit?

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