Ahsec Class 11 Biology Solved Question Paper - 2023| ASSEB BOARD
2023
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. Write the answer of the following briefly: 1x 5=5
(a) What is
binomial nomenclature?
Ans:-
Binomial nomenclature is a system of naming organisms using two Latin names:
the genus and the species.
(b) What is
prothallus?
Ans:- A
prothallus is the heart-shaped, haploid gametophyte stage in the life cycle of
ferns and related plants.
(c) Name one
red algae.
Ans:-
Porphyra is a type of red algae.
(d) What is
called by meristem?
Ans:-
Meristem is actively dividing tissue responsible for plant growth.
(e) What is
hydroponics?
Ans:-
Hydroponics is a technique of growing plants without soil, using a
nutrient-rich water solution.
2. Write short answer of the following: 2x5=10
(a) What are
the five kingdoms of living world?
Ans:- The
five kingdoms of the living world are Monera, Protista, Fungi, Plantae, and
Animalia.
(b) Write the
characteristics of prokaryotic cell.
Ans:-
Characteristics of Prokaryotic Cells are:-
Prokaryotic
cells lack a true nucleus and membrane-bound organelles, they have a single
circular DNA as genetic material without histones, and they possess 70S
ribosomes and a cell wall often containing peptidoglycan.
(c) Mention
the two functions of corolla.
Ans:-
Functions of the Corolla are:-
The corolla
attracts pollinators such as insects with its bright colors and fragrance, and
protects the inner reproductive organs such as the stamens and carpels.
(d) Name the
various types of activation.
Ans:- Types
of Activation are:-
Activation
refers to enzyme activation energy in catalysis; types include allosteric
activation and covalent modification, although it is primarily discussed in
terms of lowering activation energy barriers.
(e) What are
the directions of translocation?
Ans:-
Directions of Translocation are:-
Translocation
in the phloem is bidirectional, from source (e.g., leaves) to sink (e.g., roots
or fruits), either upward or downward depending on the plant's needs.
3. Write about the various modifications of stem. 3
Ans:- In plants, stems undergo various modifications
to perform functions such as storage, support, propagation, and protection.
These modifications occur underground, above ground, and in the air, helping
the plant survive.
(i)
Underground Modifications: Rhizomes, like those of ginger, store food and
aid in vegetative propagation with scale leaves and buds. Tubers, such as
potatoes, act as storage organs with axillary buds (eyes) for the development
of new plants. Bulbs (onions) and corms (taro) also store nutrients underground
for perennial survival.
(ii)
Above-Ground Modifications: Above-ground stems, like runners in grasses,
spread horizontally above the ground for vegetative propagation. Stolons in
strawberries and offsets in Eichhornia similarly produce new plants from their
tips.
(iii) Aerial
Modifications: Aerial stems form tendrils for climbing in cucumbers, thorns
for protection in citrus fruits, and phylloclades in cacti for photosynthesis
and water storage.
4. Mitochondria are powerhouse of the cell.' Explain it.
3
Ans:- Mitochondria are called the "powerhouse of
the cell" due to their role in ATP production. They perform cellular
respiration, converting glucose into energy through the Krebs cycle and
electron transport chain.
Mitochondrial
Structure: The cristae of the inner membrane contain oxysomes (ATP
synthase) that produce ATP from ADP and Pi. This double-membraned organelle,
with its own DNA, efficiently generates energy for cellular activities.
Role of
Energy: During respiration, mitochondria oxidize pyruvate into CO2 and H2O,
trapping the energy as ATP, the universal energy currency of the cell.
5. Draw and describe the internal structure of chloroplast.
4
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