ST.
XAVIER'S SENIOR SECONDARY SCHOOL, DELHI - 110 054
Mid-Term Examination in BIOLOGY
Std. 11 Time : 3 hrs.
26-9-2019 Max. Marks : 70
Total printed pages : 03
Roll No: Total printed questions : 37
General Instructions:-
i) All questions are compulsory.
ii) This question paper consists of four section A B C and D.
Section A consists of 20 questions of 1 mark each, Section B consists of 7 questions of
two marks each, Section C consists of 7 questions of three marks each. Section D
consists of 3 questions of five marks each.
iii) There is no overall choice. However, an internal choice has been provided in one
question of 2 marks, two questions of 3 marks and all the three questions of 5 marks
weightage. A student has to attempt only one alternative in such question.
iv) Wherever necessary draw neat and well labelled diagrams.
SECTION – A
1. All eukaryotic unicellular organisms belong to: 1
a) Monera b) Protista c) Fungi d) Bacteria
2. Phloem in gymnosperms lacks : 1
a) Albuminous cells and sieve cells b) Sieve tubes only
c) Companion cells only d) Both sieve tubes and companion cells
3. Which of the following is a defining characteristic of living organisms? 1
a) Growth b) Reproduction
c) Ability to make sound d) Response to external stimuli
4. A conjoint and open vascular bundle will be observed in the transverse section of a 1
a) Monocot root b) Monocot stem
c) Dicot root d) Dicot stem
5. Match the following: 1
(a) Protein (i) SER
(b) Lipid (ii) Golgi body
(c) Glycoprotein (iii) Lysosome
(d) Hydrolytic enzyme (iv) RER
a) a - i, b - ii, c - iii, d - iv b) a - iv, b -ii, c - i, d - iii
c) a - iv, b - i, c - ii, d - iii d) a - i, b - iii, c - ii, d – iv
6. Which among the following is not associated with asexual reproduction? 1
a) Gamete formation b) Fragmentation
c) Spore formation d) Budding
7. The embryo sac of an angiosperm is made up of: 1
a) 8 cells b) 7 cells and 8 nuclei
c) 8 nuclei d) 7 cells and 7 nuclei
8. Coenzyme of a conjugate enzyme is more often a/an 1
a) Vitamin b) Inorganic compound
c) Metal ion d) Both metal ion and inorganic compound
9. Which is wrong about mitochondria? 1
a) Site of aerobic respiration
b) Supported by double unit membrane
c) Infolding of inner membrane forms cristae
d) Many circular DNA and few ribosomes are found in matrix.
10. Pteridophytes differ from bryophytes in having 1
a) Archegonia b) Vascular tissue
c) Motile antherozoids d) Alternation of generation
Std. 11 page 2 BIOLOGY
11. ________________ is the title of the publication of Linnaeus. 1
12. The swollen leaf base, as seen in some leguminous plants, is called ________________. 1
13. The phase of nuclear division, is called ________________. 1
14. Identify the placentation in the following;- (i) and (ii) 1
(i) (ii)
15. What makes the body of euglenoids flexible? 1
16. What is the skeleton of Poriferans made of? 1
17. What does a couplet in a key represent? 1
18. Name the two layers of cells in diploblastic animals. 1
19. Which tissue of animals and plants exhibits meiosis? 1
20. Which of these has more number of species, an order or a family? 1
SECTION – B
21. Name the four processes that are basic to taxonomy. 2
22. a) Why are lichens considered as pollution indicators?
b) Who discovered viroids? Name a plant disease caused by viroids. 2
23. Differentiate between Red Algae and Brown Algae on the basis of their pigments
and stored food. 2
24. a) According to the following description, write the floral formula:
Flowers bilaterally symmetrical, bisexual, 5 fused sepals, 5 fused petals and 4 free
stamens, superior ovary, 2 fused carpels.
b) Identify the parts marked
as A, B in the floral diagram shown:
(OR)
Draw the structure of a maize grain in section. 2
25. Differentiate between heartwood and sapwood. 2
26. What are the main postulates of cell theory? 2
27. How does cytokinesis differ in plant cell and animal cell? 2
SECTION – C
28. Describe the arrangement of floral members in relation to their insertion on thalamus. 3
29. What is alternation of generations? Describe how bryophytes exhibit this phenomenon
in their life cycle. 3
30. Classify the plastids on the basis of the types of pigments found in them.
State the function of each type. 3
Std. 11 page 3 BIOLOGY
31. Differentiate between phycomycetes and ascomycetes on the basis of mode of sexual
reproduction and mycelium. Also state one example of both. 3
32. Differentiate between a dorsoventral leaf and Isobilateral leaf. 3
33. Explain the three types of cell junctions.
(OR)
Answer the following questions with respect to areolar tissues: 3
a) Where is areolar tissue present?
b) What is the function of this tissue?
c) How does it differ from adipose tissue?
34. What is cell cycle? Draw the diagrammatic representation of cell cycle.
Name the phase of DNA synthesis.
(OR)
Identify the events in the following and name the stage of cell division:- 3
a) Spindle formation.
b) Pairing of Homologous chromosomes.
c) Exchange of genetic segments.
d) Splitting of the centromeres.
e) Formation of daughter cells.
f) Alignment of chromosomes at the equator of the spindle.
SECTION – D
35. a) Draw a labelled diagram of the reproductive system of a female cockroach.
b) How do the nymphs differ from adult cockroaches?
(OR)
Describe the various types of epithelial tissues with the help of labelled diagrams. 5
36. Discuss the five classes of Phylum Chordata.
(OR)
a) Differentiate between the animals of Chondrichthyes and Osteichthyes.
b) Diagrammatically represent coelomate and pseudocoelomate conditions among animals. 5
37. Describe five classes of enzymes.
(OR)
a) The concentration of a substrate is allowed to increase continuously. Explain the effect
of this rise on the rate of enzymatic reaction.
b) Explain competitive inhibition by giving an example. 5
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