AHSEC| CLASS 11| BIOLOGY| QUESTION PAPER - 2021| H.S.1ST YEAR
2021
BIOLOGY
(Theory)
Full Marks: 70
Pass Marks: 21
Time: 3 hours
The figures in the margin indicate
full marks for the questions
Use separate Answer-scripts for
Part-I (Botany) and Part-II (Zoology)
PART-I
(Botany)
(Marks: 35)
1. Where are the chlorophylls present in chloroplast? 1
2. Who proposed five-kingdom concept of living world? 1
3. Who proposed binomial nomenclature? 1
4. In which phase of cell cycle DNA synthesis occurs? 1
5. Write the characteristics of Monera. 2
6. What are the significances of meiosis? 2
7. What is cambium? What are the functions of it? 1+1=2
8. What are the pigments involved in photosynthesis? 2
9. Distinguish between (any one): 3
(a) Stroma and
Thylakoid
(b) Light
reaction and Dark reaction
10. Draw and label the different tissues revealed under
transverse section of a dorsiventral leaf. 3
11. “Lysosomes are regarded as suicidal bag of cell.”
Explain. 3
Or
Explain with
diagram on the structure of a typical chromosome.
12. Write the differences between Xylem and Phloem. 2
13. What do you mean by Kranz Anatomy'? 2
14. With diagram, describe the alternation of generation. 4
Or
Write the
different types of five-kingdom system of classification.
15. What do you mean by light reaction of photosynthesis?
Write the difference between cyclic photophosphorylation and non-cyclic
photophosphorylation. 1+4-5
Or
What is Calvin cycle? Describe
the different stages of Calvin cycle. 5
PART - II
(Zoology)
(Marks: 35)
1. Fill in the blanks: 1×5=5
(a) Echinoderms
are _______symmetrical.
(b) Non-protein
part of enzymes is called ______.
(c) Alkaloids
are _____.
(d) Mitochondria
is known as _______of cell.
(e) Molecules
present in the cell is called _______.
2. Give very short answers of the following (any four):
1×4=4
(a) Define cell
cycle.
(b) What is
axon?
(c) Name one fat
splitting enzyme.
(d) Which node
acts as a pacemaker of the heart?
(e) How is
oxygen carried in the blood?
(f) What is
muscular system?
3. Write the differences between the following (any two):
2x2=4
(a) Bone and
Cartilage
(b) Exocrine and
Endocrine glands
(c) Small and
Large intestine
(d) Red blood
corpuscle and White blood corpuscle
4. Answer the following briefly (any three): 2×3=6
(a) Write the
four general characters of annelids.
(b) Write the
names of bile pigments.
(c) Write a note
on oxygen haemoglobin dissociation curve.
(d) Write about
cytoskeleton.
(e) write about
body symmetry.
5. Write short notes on (any two): 3×2=6
(a) Chemical
nature of enzymes
(b) Nucleus
(c) Significance
of meiosis
(d) Reflex
action
6. Describe the digestive system of human with diagram.
4+1=5
Or
What is
respiration? Describe the different types of respiration. 1+4=5
7. What is chemical coordination? What are the hormones
secreted by thyroid gland? Mention their functions. 1+2+2=5
***
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