Roll no.

Subject Code-044
Please check that this question paper
contains 33 questions and has & printed
pages.
D.A.V. INSTITUTIONSCHHATTISGARH
HALF YEARLY EXAMINATION-2024-25
CLASS-XI
SUBJECT-BIOLOGY (044)
Time Allowed: 3 Hours Maximum Mark-70

General Instructions: -
(i)AIlquestions are compulsory.
(ii) The question paper has five sections and 33 questions. All questions are compulsory.
(ii) Section- A has 16 questions of 1mark each; Section-B has 5 questions of 2 marks each; Section-Chas 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 labeled diagrams should be drawn.

SECTION-A
1.Which of the following is involved in the formation of peat
that have long been used as fuel?
(a) Marchantia
(b) Polytricum
(c)Sphagnum
(d) Funaria

2. Identify the given diagrams and

choose the correct option.

A
B

(a) A-Hypogynous,
(b) A-Hypogynous B-Perigynous,
B- Epigynous, C-Perizynous, D-Epigynous
(c) A- Perigynous, B- Perigynous, C- Epigynous, D- Perigynous
(d) A-, Hypogynous B-Epigynous, C- Hypogynous, D- Epigynous
C- Perigynous , D- Perigynous

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 2Match thefollowing and choose the correct
combination from the option given:
Column-I
A. Chief producers in the ocean Column-II
B. Red tide in the ocean 1.Euglena
C. Photosyntheticas well as predaceous 2.Trypanosoma
3.Diatoms
D. Flagellated Parasitic protozoan
4.Paramoecium
5.Gonyaulax
(a) A-3, B-4, C-S, D-2
(b) A-3, B-5, C-1, D-2
(c) A-5, B-4, C-3, D-2
(d) A-4, B-3, C- 2, D- 1

4. Which cellular organelle is found as a paired structure and each structure in the pair is perpendicular to
each other in which each has an organization like the cartwheel?

(a) Flagella (b) Centrosome

(c) Mesosome (d) Endoplasmic reticulum

5.The word systematics refers to: -

(a) Identification and preservation of plants and animals

(b) Study of habitats of organisms and their classification.
(c) Identification and study of organ system of plants and animals
(d) The Evolutionary relationship between organisms
6. Identify the correct statements: -

is radial.
A. The arrangement of vascular bundles in root
B- Bulliform cells in grasses become turgid due to water stress.
the vascular bundles of monocot stem.
C- Water containing cavities are present within
within the vascular bundles of dicot stem.
D- Water containing cavities are present
E-Bulliform cells in grasses become flaccid due
to water stress.

given below: -
Choose the correct answer from the options

(a) D, E, and A only

(b) A, B and Conly
(c) A, C and E only
(d) C, D and Aonly

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7. Given below are two statements: -
Statement -I: -Theear is an organ of hearing as well as balancing in frog.
Statement -I: -There is functional connecion of ovaries with kidneys in the female frog.

a) Statement -I is incorrect but Statement -II is true

b) Both Statement -I and Statement -IIare true
c) Statement -I is correct but Statement -II is incorrect
d) Both Statement -I and Statement -Il are incorrect.

8. Which of the following statements are true in reference to respiration in frog?

I. Skin act as aquatic respiratory organ
II. The respiration by lungs is called pulmonary respiration.
II. Gases exchange take place through buccal cavity during hibernation and aestivation
IV. Air enter through the nostril to buccal cavity and then to lungs.

(a) I, II, III (b) II, II, IV

(c) III, IV,I (d) I, I, IV
9. Plants like Convolvulaceae and Solanaceae are
included in the order polymonials mainly on?
(a)The stem characters
(b) The fruit characters
(c)The floral characters
(d) The seed characters

10. Identify the type of placentation and example

depicted in given diagram.

a) free central placentation-Primrose

b) Parietal placentation-Argemone
c) Basal placentation-Marigold
d) Axile placentation-China rose
11.Find the correct match for the type of leucoplast and
nutrient stored in it: -
a) Amyloplast-protein, Elaioplast-oil, Aleuroplast-starch
b) Amyloplast-starch, Elaioplast-oil, Aleuroplast-protein
c) Amyloplast-starch, Elaioplast-protein, Aleuroplast-oil
d) Amyloplast-oil, Elaioplast-protein, Aleuroplast-starch

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 12. The criteria for universal rules of
nomenclature are: -
() Biologicalnames are generally inLatin andwritten in Italics.
They are latinized or derive
Latin.
(i) Ihe first word in a biological name represents specific ep1the.
written, are not separately underlined.
(ii) Both the words in abiological name, when
(iv) The first word denoting the genus starts with a capital letter.
combination.
Which one of the following choices isa correct

a) () and (ii) b) (ii) and (iv)

c) (i) and (iv) d) (ii) and (iii)

Assertion (A) and Reason (R).
Ouestion No. 13 to 16 consists of two statements-
given below.
Answer these questions selecting the appropriate option
of the Assertion.
and the Reason is a correct explanation
A. Both Assertionand Reason are true explanation of the Assertion
but the Reason is not a correct
B. Both Assertionand Reason are true
false.
C. Assertion is true but Reason is
true.
D. Assertion is False but Reason is

Rhodophyceae are commonly known as red algae

13.Assertion: -The members of fucoxanthin and r-phycoerythrin in their
body.
carotenoids,
Reason: -They contain red pigments
examples of non-endospermic seeds.
14. Assertion: - Bean, Pea and gram are fertilization.
formed as a result of double
Reason: -In castor, endosperm is

bundle is conjoint, open and with endarch protoxylem.

15. Assertion:-In Monocot stem, each vascular ring.
Reason: -In Dicot Vascular bundle are arranged
in

16. Assertion: -frog is poikilothermous animal. temperature of environment.

Reason: -In frog, body temperature varies with the
SECTION-B
17. (a) What are hydrocolloids?
(b) Name the hydrocoloid produced by (i) Brown algae and (ii) red algae.
coelenterate.
18. Figure given below represent the two forms of animals belonging to the phylum
Answer the questions that follow: -

b)
(a in thetr b

(a) Name the forms (a) and (b).

(b) Differentiate between the twoforms.
19.Fill up A, B,C, Din the gìven table of organisms with their categories?

Biological Name Genus Family Order class Phylum/Division

Mango Mangifera A sapindales Dicotyledonae B
Housefly Musca D Insecta |Arthropoda

20. What is Diatomaceous carth? Write any one use of diatomaceous earth?
OR
Why the members of class Deuteromycetes are considered the imperfect fungi? How do they reproduce
during asexual reproduction?

21. Answer the following questions with respect to the digestive system of frog.
(a)Name the duct through which duodenum receives bile and pancreatic juices.
(b)Give the role of bile in digestion.
SECTION-C

22.Kingdom Protista forms a link with other kingdom dealing with plants, animals and fungi. Justify the
statement based on the mode of nutrition shown by three different protistan groups?

23. What is a mesosome in a prokaryotic cell? Mention the two functions that it performed?

24.Answer the following questions: -

a) Why are stamens of Brinjal called as epipetalous?

b) How does the mesocarp of Mango differ from that of coconut, though they are drupes?
c) Identify the type of aestivation shown in figure and give an example in which its present.

25. Mention the ploidy of in the following: -

(a) Zygote in Fern (b) Protonema cell of a moss
(c)Gemma cell in Marchantia (d) Prothallus of fern
(e) Ovum of Liverwort () Leaf cellof moss

Monocot stem and a Monocot root?

26.Write three differences between the vascular bundles of a
27. The diagrams given below show the arranigement of germinal layers.

(i) ldentify the parts labeled Aand Bin the íagrams.

(ii) What technical term is gíven to anímals with pattern (a) and (b) respectively.
(ii) How is Cin the diagram (a) different from Din the diagram (b).
OR
Mention any four distinguishíng features ofthe phylum Ctenophora. Give two examples ofanimals
of this phylum?
28. (a) Where is conus arteriosus located in the heart of frog?
(b)Name the two special venous connections found in the circulatory system of frog?
(c) Give two identifying features of an adult Male frog?

SECTION-D
Question No. 29 and 30 are case-based questions. Each question has 3 subpartswith internal choice in one
subpart.
29.The floral characteristics form the basis of classification and identification of flowering plants. This can
be illustrated through semi technical descriptions of families; Hence, a flowering plant is described in a
definite sequence by using scientific terms. The floral features are represented in the summarized form as
floral diagram andfloral formula.

Observe the above floral diagram of Solanum nigramof family Solanaceae and answer the
questions.
following
(a) Write floral formula of Solanum nigram? (1)
(b) Define semi -technical term Actinomorphic flower and ovary superior" (1)
OR
Name two plants of family Solanaceae used as medicinal purposes?

(c) what is inflorescence? What type of inflorescence seen in Solanum nigram? (2)

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 30. Two membeTs of aclass of alg2e are
follow: - shown helo Ohsene the faures and aswer he
qIES

Frond
Mdrtb

Holdfast

()
(a) Identify the two algae Aand B. ()
(b) Mention the forms of their stored food?
OR
Whatis the function of holdfast in these algae? (2)
in these algae?
(c) What is the shape of gamete and major pigments present
SECTION-E

31. Name the following:

(i) A limbless animal.
(ü)Oviparous mammal.
Nereis help in swimming. of calcium carbonates.
(im)Lateral appendages in skeleton composed
the cnidarians have a
(iv) Some of
Balaenoptera.
(v)A common name of man-of-war
(vi)Scientific name of Portuguese
(vii) A Gregarious pest Mollusca
organ for feeding in
(viii) A file like rasping
ofAntedon
(ix) A common name supplement respiration in Birds.
connected to lungs
(x)
OR
following features: -
Name the phylum/class in which organisms have
bones with air cavities.
a) The long and hollow
and placoid scales on body.
b) The gills without operculum with water vascular system and larva bilaterally symmetrical.
symmetrical
c) A adult radially excretion by Malpighian tubules
d) The jointed appendages and osmoregulation and excretion.
nephridia for
segmentation and
e) The metameric
with collar cells.
) A Spongocoel cavity linedpseudocoelomates.
g) The muscular mouth and parasitic foms.
h) The hooks and suckers present in the
and have comb plates.
i) The commonly known as comb jelly jaws.
j) The Sucking and circular mouth without

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32. (a)ldentify the part of plant whose transverse section is given below?
(b)Name a part labelled as B and D in the given diagram?
(C) What type of tissue makes up the parts labelled as B and D.
(d) How is hypodermis of dicot stem and monocot stem differed?
(e) Draw diagram of conjoint and closed vascular bundle?

OR
(a) What is stomatal apparatus? Explain the structure of Dicot stomata with a labelled diagram?

(b) Which part of the plant show radial vascular bundle, polyarch xylem and well-developed pith?
(c) Name a part of the plant has open, conjoint vascular bundle, endarch condition of protoxylem?
33.Who proposed the fluid mosaic model of plasma membrane and when? Describe the fluid mosaic model
of plasma membrane with help of labelled diagram?
OR
(a) Identify A, B, Cand D as shown in section view of chloroplast.

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structures, yet they differ in terms of their

(b) Both lysosome and vacuole are endomembrane
functions. Comments?
the cell?
(c) Write a function of nuclear pore in