AHSEC| CLASS 11| BIOLOGY| QUESTION PAPER - 2019| H.S. 1ST YEAR
2019
Biology
(Theory)
Times: 3 hours
Full marks: 70
Part - I (Botany)
1. Who proposed binomial nomenclature? 1
2. Fusion of two nuclei in sexual cycle is called ______.
(Fill in the blank) 1
3. What is the common name of phaeophycean algae? 1
4. Potato is a modification of root. (Write True or
False) 1
5. Name the proposer(s) of cell theory. 1
6. Define and distinguish (any four): (1+1)x4=8
(a) Prokaryotic
and eukaryotic cells
(b) Heartwood
and Sapwood
(c) Antheridia
and archegonia
(d) Tracheids
and Vessels
(e) Cyclic and
non-cyclic phosphorylations
(f) Macro and
micro-nutrients for plants.
7. Answer briefly any three of the following: 3x3=9
(a) What is
meant by heterospory? Write the significance of heterospory.
(b) What is
hydroponics? Explain the uses and applications of hydroponics.
(c) What are
nuclear pores? State their functions.
(d) What are
phytohormones? Explain the role of phytohormones in seed germination.
(e) Give an
account on the structure and function of embryo sac in angiosperms.
8. Write precise notes on the following (any two): 4x2=8
(a) Various
steps involved in glycolysis
(b) Alternation
of generation in bryophytes with illustration.
(c) Importance
of meiotic cell division in plants and the denifition of quiescent stage 
of cell cycle.
(d) Description
on the different stages of Calvin cycle.
9. Define photoperiodism and vernalization. Based on the flowering
responses, how can you categorize the angiosperms? 3+2=5
Or
What are nucleic
acids? Mentioning the basic components, draw the structure of a DNA
molecule. 2+3=5
Part - II
(Zoology)
1. Fill in the blanks: 1x5=5
(a) Notochord is
derived Frome embryonic _______.
(b) _______are
radially symmetrical animals.
(c)
Crossing-over takes place in _____cell division.
(d) The
secondary structure of protein is due to _______.
(e) RBC has the
life span of about _______days.
2. Answer very briefly any four of the following: 1x4=4
(a) What is the
function of ink gland?
(b) Animals of
which phylum contain spicules as their endoskeleton?
(c) What is the
function of gizzard?
(d) Name the
tissue where fats are deposited.
(e) Write the
name of two sub-plases of M-phase in cell cycle.
(f) Why is
spleen called the graveyard of red blood corpuscles?
3. Write the differences between the following (any
two): 2x2=4
(a) DNA and RNA
(b) Exocrine and
endocrine glands
(c) Striated and
unstriated muscles
(d) Small
intestine and large intestine
4. Answer the following briefly (any three): 2x3=6
(a) What is
myogenic heart?
(b) Name the two
covalent bonds responsible for maintenance of a protein structure.
(c) “All
vertebrates are chordates but all chordates are not vertebrates.” Justify the
statement.
(d) Write the
economic importance of earthworm.
(e) How does
conduction of nerve impulses take place through synapse?
5. Write short notes on (any two): 3x2=6
(a)
Polysaccharides
(b) Skeletal
muscles
(c) Auditory
mechanism
(d) Uricotelic
animal
6. What is neuron? Describe the sturcture of a myelinated
neuron with a labelled diagram. 1+2+2=5
Or
What is hormone?
Write the chemical nature of hormone. Mention four important functions of
thyroxine hormone. 1+2+2=5
7. What is circulatory system? Illustrate a cardiac cycle
with suitable diagram. 1+2+2=5
Or
What is
locomotion? Describe the sliding filament theory of locomotion. 1+4=5
***
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