M.C.Q (1 Marks)

MCQ 11 Mark

The major factor which affects binding related to the partial pressure of carbon dioxide is _____.

A
$pO _2$
B
$CO _2$
C
$pCO _2$
D
$O _2$

Answer

(a) $pO2$
Explanation: $CO _2$ is carried by haemoglobin as carbamino-haemoglobin. This binding is related to the partial pressure of $CO _2$ $pO _2$ is a major factor that could affect this binding.

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MCQ 21 Mark

What is the main role of skin in human?

A
Attack
B
Excretion
C
Thermoregulation
D
Protection

Answer

(d) Protection
Explanation: The skin is one of the largest organs in the body in surface area and weight. The skin consists of two layers: the epidermis and the dermis. Beneath the dermis lies the hypodermis or subcutaneous fatty tissue. The skin has three main functions: protection, regulation, and sensation.

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MCQ 31 Mark

Thallus of Riccia is ________ .

A
Triploid
B
Diploid
C
Tetraploid
D
Haploid

Answer

(d) Haploid
Explanation: A dominant, independent, photosynthetic, thalloid, or erect phase of Bryophytes and pteridophytes is represented by a haploid gametophyte.

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MCQ 41 Mark

If GA3 is applied to the rice seedlings, the plant will show:

A
Early flowering
B
Extra elongation
C
Delayed ripening
D
Dwarfing

Answer

(b) Extra elongation
Explanation: GA3 is gibberellin that helps in the elongation of the stem of the plant. If the GA3 plant hormone is applied to the rice seedling the plant will show extra elongation of the plant body.

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MCQ 51 Mark

Whales can live in cold water as they have thick coat of _________.

A
Keratinized skin
B
Striated skin
C
Blubber
D
Proactive skin

Answer

(c) Blubber
Explanation: Whales can live in cold water as they have a thick coat of blubber. Blubber help in providing insulating coat beneath the skin that prevents loss of heat from the body.

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MCQ 61 Mark

Urea cycle operates in:

A
Liver
B
Lungs
C
Skin cells
D
Sweat glands and sebaceous glands

Answer

(a) Liver
Explanation: Urea cycles operate in the liver, where ammonia is converted into urea. Sometimes urea cycle also occurs in the kidney.

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MCQ 71 Mark

Electrons from excited chlorophyll molecules of photosystem II to photosystem I transferred and finally convert:

A
NADH to NAD
B
PGA to NAD
C
ATP to NADH
D
NAD to NADH

Answer

(d) NAD to NADH
Explanation: After absorbing light, electrons are excited and transferred through PS II and PS I and finally to NAD forming NADH.

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MCQ 81 Mark

How will you define the lungs?

A
Respiratory Control Centre
B
Pneumotaxic Centre
C
Chemosensitive Centre
D
Respiratory Rhythm Centre

Answer

(d) Respiratory Rhythm Centre
Explanation: The lung is a bag-like structure made up of bronchioles and alveoli. This is the place where the exchange of gases takes place.

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MCQ 91 Mark

Monocotyledonous leaves are ________.

A
Dorsiventral
B
Round
C
Pinnate
D
Isobilateral

Answer

(d) Isobilateral
Explanation: Monocotyledonous leaves are isobilateral as both the lower and upper sides of the leaves are the same.

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MCQ 101 Mark

An important site for the formation of glycoproteins and glycolipids is:

A
Vacuoles
B
Lysosomes
C
Plastids
D
Golgi apparatus

Answer

(d) Golgi apparatus
Explanation: Synthesis of glycoproteins and glycolipids take place in Golgi apparatus inside the cell. Golgi apparatus is located near the nucleus of the cell

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MCQ 111 Mark

The epithelial cells of Bowman's capsule are called:

A
Calyces
B
Filtration slits
C
Podocytes
D
Slit pores

Answer

(c) Podocytes
Explanation: Podocytes are cells in the Bowman's capsule in the kidneys that wrap around capillaries of the glomerulus. The Bowman's capsule filters the blood, retaining large molecules such as proteins while smaller molecules such as water, salts, and sugars are filtered as the first step in the formation of urine.

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MCQ 121 Mark

Sometimes different authors give different names to one and the same species. In such a situation:
A. The name under which the species was first described is a valid name.
B. The latest name under which the species was described is valid.
C. People can use any one of the names for the species.
D. All known names are discarded and a new name is given to the species.

A
(D)
B
(B)
C
(A)
D
(C)

Answer

(c) (A)
Explanation: In Mangifera indica Linn, the word 'Linn' indicates that this species was first described by Linnaeus. Hence, the correct option is The name under which the species was first described is the valid name.

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BIOLOGY M.C.Q (1 Marks)

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