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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 1 · 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
Loud snoring and labored breathing are symptoms of:
  • A
    Peripheral sleep apnea
  • B
    Obstructive sleep apnea
  • C
    Bronchitis
  • D
    Central sleep apnea
Answer
(b) Obstructive sleep apnea
Explanation: Loud snoring and labored breathing are the symptoms of obstructive sleep apnea. Obstructive sleep apnea is a sleep disorder in which breathing is briefly and repeatedly interrupted.
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MCQ 21 Mark
The following substances are the excretory products in animals. Choose the least toxic form among them.
  • A
    Carbon dioxide
  • B
    Ammonia
  • C
    Urea
  • D
    Uric acid
Answer
(d) Uric acid
Explanation: Uric acid is being the least toxic excretory products in animals. Hence, it can be removed with a minimum loss of water.
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MCQ 31 Mark
In mosses, the sex organs arise from:
  • A
    Foot
  • B
    Leaf apex
  • C
    Setae
  • D
    Capsule
Answer
(b) Leaf apex
Explanation: In sexual reproduction, the sex organs antheridia and archegonia are produced at the apex of the leafy shoots.
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MCQ 41 Mark
A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which plant hormones can be applied to achieve this ?
  • A
    Gibberellins
  • B
    Auxins
  • C
    Ethylene
  • D
    Abscisic acid
Answer
(c) Ethylene
Explanation: Ethylene promotes female flowers in cucumbers thereby increasing the yield.
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MCQ 51 Mark
Platelets are formed from the _____________.
  • A
    Haemocytes
  • B
    Microkayocytes
  • C
    Thrombocytes
  • D
    Megakaryocytes
Answer
(d) Megakaryocytes
Explanation: Platelets are a little piece of blood cells that help wound healing and prevent bleeding by forming a blood clot. It is formed from the megakaryocytes.
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MCQ 61 Mark
The condition of accumulation of urea in the blood is termed as:
  • A
    Glomerulonephritis
  • B
    Ketonuria
  • C
    Uremia
  • D
    Renal Calculi
Answer
(c) Uremia
Explanation: Malfunctioning of kidneys can lead to accumulation of urea in blood, a condition called uremia, which is highly harmful and may lead to kidney failure.
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MCQ 71 Mark
Which is the most effective wavelength of light for photosynthesis ?
  • A
    Yellow
  • B
    Violet
  • C
    Red
  • D
    Green
Answer
(c) Red
Explanation: Certain red and blue wavelengths of light are the most effective in photosynthesis because they have exactly the right amount of energy to energize, or excite, chlorophyll electrons and boost them out of their orbits to a higher energy level.
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MCQ 81 Mark
It is known that exposure to carbon monoxide is harmful to animals because:
  • A
    It increases O₂ transport
  • B
    It increases CO₂ transport
  • C
    reduces CO₂ transport
  • D
    It reduces O₂ transport
Answer
(d) It reduces O₂ transport
Explanation: Breathing of carbon monoxide is harmful to animals as carbon monoxide binds with haemoglobin to form carboxyhemoglobin due to which oxygen is not released to the tissues.
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MCQ 91 Mark
Bulliform or motor cells are present in
  • A
    Dorsiventral leaves of dicot
  • B
    Isobilateral leaves of monocot
  • C
    Unifacial leaves of monocot
  • D
    Dorsiventral leaves of monocot
Answer
(b) Isobilateral leaves of monocot
Explanation: Bulliform cells or motor cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots on the upper surface of the leaf.
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MCQ 101 Mark
Amino acids are also known as:
  • A
    $\delta$ - amino acid
  • B
    $\beta$-amino acid
  • C
    $\gamma$-amino acid
  • D
    $\alpha$-amino acid
Answer
(d) a-amino acid
Explanation: Amino acids share a basic structure, which consists of a central carbon atom, also known as the alpha (a) carbon.
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MCQ 111 Mark
If kidney tissues are supplied with blood low in oxygen then:
  • A
    Both tubular reabsorption and ultrafiltration stops
  • B
    Both tubular reabsorption and ultrafiltration continue normally
  • C
    Ultrafiltration stops
  • D
    Tubular reabsorption stops
Answer
(d) Tubular reabsorption stops
Explanation: If Kidney tissues are supplied with blood having low oxygen in it then tubular reabsorption gets stopped as energy is required for active absorption.
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MCQ 121 Mark
Which is the topmost taxa in zoology ?
  • ✓
    Phylum
  • B
    Division
  • C
    Order
  • D
    Kingdom
Answer
Correct option: A.
Phylum
(a) Phylum
Explanation: In biology, a phylum is a level of classification or taxonomic rank below kingdom. If we talk only about Zoology phylum is on top
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