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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 5 · 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 · 1 auto-graded MCQ + 11 self-marked written.

MCQ 11 Mark
70% of carbon dioxide is transported as bicarbonate by the enzyme
  • A
    Carbaminase
  • B
    Carbonates
  • C
    Carbonic anhydrase
  • D
    Carbonic hydrase
Answer
(c) Carbonic anhydrase
Explanation: An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions. When red blood cells reach the lungs, the same enzyme helps to convert the bicarbonate ions back to carbon dioxide, which we breathe out. It transports nearly 70% of carbon dioxide as bicarbonate.
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MCQ 21 Mark
Which one of the following is also known as antidiuretic hormone?
  • A
    Calcitonin
  • B
    Adrenaline
  • C
    Vasopressin
  • D
    Oxytocin
Answer
(c) Vasopressin
Explanation: Vasopressin is called ADH or anti-diuretic hormone.
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MCQ 31 Mark
Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is:
  • A
    Gymnosperms
  • B
    Dicots
  • C
    Monocots
  • D
    Pteridophytes
Answer
(a) Gymnosperms
Explanation: Gymnosperms have reproductive structure as cones i.e. Male and female.
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MCQ 41 Mark
Parthenocarpy can be induced to develop seedless fruit by application of:
  • A
    Zeatin and IAA
  • B
    IBA and cytokinin
  • C
    IAA and IBA
  • D
    Ethylene and gibberellins
Answer
(c) IAA and IBA
Explanation: Auxins (IAA, IBA) also induce parthenocarpy, (Seed fewer fruits) e.g., in tomatoes.
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MCQ 51 Mark
The lymph in frog lacks:
  • A
    RBC and plasma
  • B
    Plasma and WBCS
  • C
    WBCs and few proteins
  • D
    RBCs and few proteins
Answer
(d) RBCs and few proteins
Explanation: The lymph is different from the blood. It is known as tissue fluid. Lymph is yellowish in colour as it lacks RBCS and few proteins.
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MCQ 61 Mark
Dialysing unit (artificial kidney) contains a fluid which is almost same as plasma except that it has:
  • A
    No urea
  • B
    High uric acid
  • C
    High urea
  • D
    High glucose
Answer
(a) No urea
Explanation: The dialysing unit contains a coiled cellophane tube surrounded by a fluid (dialysing fluid) having the same composition as that of plasma except the nitrogenous wastes like urea.
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MCQ 71 Mark
$C_4$ photosynthetic efficiency is more than $C_3$ pathway because:
  • A
    Photorespiration is present in $C_3$
  • ✓
    Photorespiration is present in both $C_3$ and $C_4$
  • C
    Photorespiration is fast in $C_4$ plants
  • D
    Photorespiration is suppressed in $C_4$ plants
Answer
Correct option: B.
Photorespiration is present in both $C_3$ and $C_4$
$C_4$ plants are more efficient than $C_3$ plants because in $C_4$ plants there is no photorespiration in which fixed carbon is oxidized in the presence of sunlight due to the presence of Kranz Anatomy. There is also a double fixation of $CO _2$.
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MCQ 81 Mark
Which of the following compound is made after haemoglobin associates with carbon dioxide?
  • A
    Carboxyhaemoglobin
  • B
    Carbaminohaemoglobin
  • C
    Carbodihaemoglobin
  • D
    Carbohaemoglobin
Answer
(b) Carbaminohaemoglobin
Explanation: Carbaminohemoglobin is a compound of haemoglobin and carbon dioxide and is one of the forms in which carbon dioxide exists in the blood. 30% of carbon dioxide is carried in blood this way (60% carried in the blood as bicarbonate [hydrogen carbonate], 10% carried as free CO₂, in solution, or plasma).
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MCQ 91 Mark
Vascular bundles in which cambium is present between xylem and phloem is called as:
  • A
    Closed
  • B
    Amphivesal
  • C
    Collateral
  • D
    Open
Answer
(d) Open
Explanation: Vascular bundles in which cambium is present between xylem and phloem are called open vascular bundles and those in which cambium is absent are called closed vascular bundles.
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MCQ 101 Mark
Which one is the cofactor for the proteolytic enzyme carboxypeptidase?
  • A
    Mercury
  • B
    Copper
  • C
    Zinc
  • D
    Magnesium
Answer
(c) Zinc
Explanation: Zinc is a cofactor for the proteolytic enzyme carboxypeptidase and forms coordination bonds with the side chains of two histidines and one glutamic acid residue at the active site. A fourth bond is formed between zinc and the a- carboxyl group of the substrate amino acids, and it is here that the cleavage of the peptide occurs.
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MCQ 111 Mark
Vasa recta is absent or reduced in:
  • A
    PCT
  • B
    Bowman's capsule
  • C
    Cortical nephrons
  • D
    Juxtamedullary nephrons
Answer
(c) Cortical nephrons
Explanation: The efferent arteriole emerging from the glomerulus forms a fine capillary network around the renal tubule called the peritubular capillaries. A minute vessel of this network runs parallel to Henle's loop forming a 'U' shaped vasa recta. Vasa recta are absent or highly reduced in cortical nephrons.
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MCQ 121 Mark
In a taxonomic hierarchy, the various categories are arranged in:
  • A
    Horizontal order
  • B
    Descending order
  • C
    Ascending order
  • D
    Vertical order
Answer
(b) Descending order
Explanation: Kingdom → Phylum/Division → Class → Order → Family → Genus → Species.
Hence, the correct option is Descending order.
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