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MODEL PAPER 6 BIOLOGY - MODEL PAPER 6

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

Question types

MODEL PAPER 6 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 6 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
Which of the following pair of factors are considered favourable for the formation of oxyhaemoglobin?
  • A
    Low $pO _2$ and low $H ^{+}$ concentration
  • B
    High$H ^{+}$ concentration and high $pO _2$
  • C
    Low $pCO _2$ and low temperature
  • D
    Low $H ^{+}$ concentration and high $pCO _2$
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Q 62 Marks Questions2 Marks
Suppose there were plants that had a high concentration of Chlorophyll b, but lacked chlorophyll a, would it carry out photosynthesis? Then why do plants have chlorophyll b and other accessory pigments?
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Q 72 Marks Questions2 Marks
A certain tree is believed to be releasing oxygen during night time. Do you believe in the truthfulness of this statement? Justify your answer by giving the reason.
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Q 16Case study (4 Marks)4 Marks
Various parts of the plant such as stems leaves, and even fruits are modified into underground parts to perform various functions such as stems, leaves, and even fruits.
The stems in ginger and banana are underground and swollen due to storage of food. They are called rhizome. Rhizome of ginger is a modification of stem because it bears nodes, internodes, terminal buds, scaly leaves and buds, which give rise to aerial shoots. It is not a root because root does not have nodes and internodes. Also, rhizome does not perform the function of roots i.e. anchorage and absorption, rather it serve as reservoir for storage of food. Similarly, corm is an underground stem in Colocasia (jimikand) The tips of the underground stem in potato become swollen due to accumulation of food and forms tuber.

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i. Observe the given flow chart and mention what are the four types of Underground stem modification also mention one example of each. (1)
ii. Ginger is an underground stem but why it is distinguished from a root? (1)
iii. Why do the tips of modified stems in potatoes become swollen? (2)

OR

Are all underground parts of a plant roots? (2)
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Q 17Case study (4 Marks)4 Marks
Sarcodines are unicellular/jelly-like protozoa found in fresh or sea water and in moist soil. Their body lacks a periplast. Therefore, they may be naked or covered by a calcareous shell. They usually lack flagella and have temporary protoplasmic outgrowths called pseudopodia. These pseudopodia or false feet help in movement and capturing prey. They include free-living forms such as Amoeba or parasitic forms such as Entamoeba. Zoo flagellates ciliates and I sporozoans are other groups of protozoan protists. They are all unicellular and heterotrophic. They may be holozoic, saprobic or parasitic.

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i. Write two lines about flagellated protozoans and also mention some flagellated protozoans. (1)
ii. Observe the given protozoan classification and mention what is the basis of protozoan classification. (1)
iii. Mention some locomotory organs of protozoa. (2)

OR

Which protozoan group has two nuclei, macronucleus, and micronucleus? Mention characteristics of it. (2)
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Q 185 Marks Questions5 Marks
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
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Q 195 Marks Questions5 Marks
Eukaryotic cells have organelles which may
i. not be bound by a membrane
ii. bound by a single membrane
iii. bound by a double membrane
Group the various sub-cellular organelles into these three categories.
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Q 23Assertion & Reason1 Mark
Assertion (A): Balantidium coli lives in colon of human beings, only.
Reason (R): The association is harmless.
  • 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
    Both A and R are false
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Q 24Assertion & Reason1 Mark
Assertion (A): In mammals, complex respiratory system has developed.
Reason (R): Mammalian skin is impermeable to gases.
  • 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): Lysozyme of tears is an example of endoenzymes.
Reason (R): Enzymes functional inside living cells are known as endoenzymes.
  • 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): Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased.
Reason (R): One of the major causes of this is cigarette smoking.
  • 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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