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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 2 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 12 questions.

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M.C.Q (1 Marks)

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12 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
The oxygen - haemoglobin dissociation curve will show a right shift in case of:
  • A
    Less $H ^{+}$concentration
  • B
    Low $pCO _2$
  • C
    High $pCO _2$
  • D
    High $pO _2$
Answer
(c) High pCO2
Explanation: The oxygen-haemoglobin curve is shifted to the right when there is high $pCO2$, low pO2, high H⁺ cono and high temperature.
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MCQ 21 Mark
Which of the following pairs is wrong?
  • A
    Ammonotelic - Tadpole
  • B
    Uricotelic - Birds
  • C
    Ureotelic - Elephant
  • D
    Ureotelic - Insects
Answer
(d) Ureotelic - Insects
Explanation: Insects excrete uric acid so they are uricotelic organisms.
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MCQ 31 Mark
A Prothallus is:
  • A
    A structure in pteridophytes formed before the thallus develops.
  • B
    A sporophytic free-living structure formed in pteridophytes.
  • C
    A gametophyte free-living structure formed in pteridophytes.
  • D
    A primitive structure formed after fertilization in pteridophytes.
Answer
(c) A gametophyte free-living structure formed in pteridophytes.
Explanation: A gametophyte free-living structure formed in pteridophytes which is of short duration.
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MCQ 41 Mark
In the wheat field, some broad-leaved weeds were seen by a farmer, which plant hormone would you sugges getting rid of the same?
  • A
    2 : 6 - D and 2 : 2 : 5 T
  • B
    2 : 4 - D and 2 : 4 : 5 T
  • C
    2 : 2 - D and 2 : 4 : 6 T
  • D
    2 : 5 - D and 2 : 5 : 5 T
Answer
(b) 2: 4-D and 2:4:5 T
Explanation: Plant hormone 2: 4-D and 2:4:5 T have ability to kills the weeds in the crop field. Weeds are unwanted plants that grow along with crop plants and compete with the crop for nutrient and water.
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MCQ 51 Mark
Frog shows which kind of excretion?
  • A
    Ammonotelic in water and ureotelic on land
  • B
    Ureotelic
  • C
    Uricotelic
  • D
    Ammonotelic
Answer
(b) Ureotelic
Explanation: Excretion of urea as metabolic waste is known as Ureotelism. Animals secreting urea are called ureotelic. Frog is ureotelic.
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MCQ 61 Mark
pH of urine under healthy conditions is:
  • A
    Slightly alkaline
  • B
    Slightly acidic
  • C
    Neutral
  • D
    Highly alkaline
Answer
(b) Slightly acidic
Explanation: The pH of urine under healthy conditions is slightly less than 7 so, slightly acidic in nature.

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MCQ 71 Mark
Dark fixation of $CO _2$ in CAM plants is called ossification because it produces:
  • A
    Oxaloacetic acid
  • B
    Malic acid
  • C
    Tartaric acid
  • D
    Formic acid
Answer
(b) Malic acid
Explanation: The dark reaction of Carbon dioxide fixation in CAM plants is called ossification because it produces Malic acid. These plants open their stomata during the night to prevent transpiration.
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MCQ 81 Mark
An ORD found chiefly among stonecutters due to inhalation of fine stone particles is named ________ .
  • A
    Bronchitis
  • B
    Chalicosis
  • C
    Siderosis
  • D
    Asthma
Answer
(b) Chalicosis
Explanation: An ORD found mainly among the stonecutters due to inhalation of fine stone particles is called as Chalicosis. It causes inflammation of the bronchioles causing respiratory difficulties.
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MCQ 91 Mark
Epiblema of roots is equivalent to:
  • A
    Pericycle
  • B
    Stele
  • C
    Epidermis
  • D
    Endodermis
Answer
(c) Epidermis
Explanation: Epiblema is found in root as single outermost layer through which root hairs arises.
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MCQ 101 Mark
Base pairs found in 5 turns of DNA spirals are ________ .
  • A
    50
  • B
    100
  • C
    10
  • D
    20
Answer
(a) 50
Explanation: Each turn of DNA spirals contains 10 base pairs. So, in five turns of DNA total number of Base pair is 5 x 10 = 50 base pairs.
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MCQ 111 Mark
What is the average amount of urine produced by a human in a day?
  • A
    1.4 litres
  • B
    15 litres
  • C
    18 litres
  • D
    180 litres
Answer
(a) 1.4 litres
Explanation: The normal range for 24-hour urine volume is 800 to 2000 milliliters per day (with a normal fluid intake of about 2 liters per day). This is the range.
So average $=\frac{800+2000}{2}=1400 ml =1.4 L$
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MCQ 121 Mark
In Magnifera indica Linn, Linn denotes:
  • A
    The name of the author who first described the genus.
  • B
    The name of the author who first described the formation
  • C
    The name of the author who first described the subspecies.
  • D
    The name of the author who first described the species.
Answer
(d) The name of the author who first described the species.
Explanation: In Mangifera indica Linn, the word 'Linn' indicates that this species was first described by Linnaeus. Hence, the correct option is the name of the author who first described the species.
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