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MODEL PAPER 9 BIOLOGY - MODEL PAPER 9

Gujarat Board (GSEB) - STD 11 Science - BIOLOGY (GSEB - English Medium). 38 questions in this chapter.

Question types

MODEL PAPER 9 question types

38 questions across 6 question groups — pick any mix to generate a BIOLOGY paper with step-by-step answer keys.

38
Questions
6
Question groups
5
Question types
Sample Questions

MODEL PAPER 9 questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Expiration will take place when there is:
A. Positive intrapulmonary pressure
B. Negative intrapulmonary pressure
C. Less pressure within lungs as compared to atmospheric pressure
  • A
    (C)
  • B
    (A)
  • C
    (B) and (C)
  • D
    (B)
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Q 153 Marks Question3 Marks
Both animals and plants grow. Why do we say that growth and differentiation in plants is open and not so in animals? Does this statement hold true for sponges also?
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Q 16Case study (4 Marks)4 Marks
Each flower normally has four floral whorls, viz., calyx, corolla, androecium and gynoecium. The calyx is the outermost whorl of the flower and the members are called sepals. Corolla is composed of petals. Petals are usually brightly coloured to attract insects for pollination. The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation. The main types of aestivation are valvate, twisted, imbricate. The shape and colour of corolla vary greatly in plants. Corolla may be tubular, bell- shaped, funnel-shaped or wheel-shaped and vexillary.

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i. Observe the given figure mentioned A, B, C and D. Also mention its function. Identify D and mention its example. (1)
ii. Ganosepalous, Ganopetalous, Polysepalous, Polypetalous, Imbricate. (1)
iii. What is Valvate and twisted aestivation? (2)

OR

Which of the following shows imbricate? Explain imbricate aestivation? (2)

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Q 17Case study (4 Marks)4 Marks
The fungi constitute a unique kingdom of heterotrophic organisms. They show a great diversity in morphology and habitat. Fungi are cosmopolitan and occur in air, water, soil, and on animals and plants. They prefer to grow in warm and humid places. Most fungi are heterotrophic and absorb soluble organic matter from dead substrates and hence are called saprophytes. When a fungus reproduces sexually, two haploid hyphae of compatible mating types come together and fuse. In some fungi, the fusion of two haploid cells immediately results in diploid cells (2n). The fungiform fruiting bodies in which reduction division occurs, leading to the formation of haploid spores. Symbionts - in association with algae as lichens and with roots of higher plants as mycorrhiza. Three types of reproduction occur in fungi

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i. Observe the given flow chart of reproduction and mention which steps involves in the sexual cycle of fungi. (1)
ii. What is Rhizopus? Also, mention Rhizopus - wheat rush a correct match? (1)
iii. What is Mycorrhiza? And mention its function. (2)

OR

In which form Fungi Stores Food Material? Do fungi have food vacuoles? (2)
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Q 225 Marks Questions5 Marks
Comment on the statement - Meiosis enables the conservation of specific chromosome number of each species even though the process per se, results in reduction of chromosome number.
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Q 23Assertion & Reason1 Mark
Assertion (A): Excessive inflation of the lungs is prevented by the Hering-Breuer reflex.
Reason (R): On overstretching of the lungs, the stretch receptors send impulses along the vagus nerve to stimulate the expiratory centre.
  • A
    Both A and R are true and R is the correct explanation of A.,
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
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Q 24Assertion & Reason1 Mark
Assertion (A): Proenzyme is the precursor of an enzyme.
Reason (R): Proenzyme is as active as the enzyme.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
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Q 25Assertion & Reason1 Mark
Assertion (A): Oxygenation of blood promotes the release of carbon dioxide from the blood in the lungs.
Reason (R): Carbon dioxide is carried as bicarbonates in erythrocytes of blood.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • D
    A is false but R is true.
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Q 26Assertion & Reason1 Mark
Assertion (A): The mycelium is coenocytic in Zygomycetes.
Reason (R): The gametes are uninucleate.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
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