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NEET Biology (Oct)2020 PYQs
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89 questions in NEET (Oct)2020
Correct position of floral parts over thalamus in mustard plant is:
A
Gynoecium occupies the highest position, while the
other parts are situated below it.
B
Margin of the thalamus grows upward, enclosing the
ovary completely, and other parts arise below the
ovary.
C
Gynoecium is present in the centre and other parts
cover it partially.
D
Gynoecium is situated in the centre, and other parts of the flower are located at the rim of the thalamus, at the same level.
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Identify the correct features of Mango and Coconut fruits.
A
(I), (III) and (IV) only
B
(I), (II) and (III) only
C
(I) and (IV) only
D
(I) and (II) only
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Which of the following is the correct floral formula of Liliaceae ?
A
Option-1
B
Option-2
C
Option-3
D
Option-4
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Which of the following statements about cork cambium is incorrect?
A
It forms secondary cortex on its outerside
B
It forms a part of periderm
C
It is responsible for the formation of lenticels
D
It is a couple of layers thick
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In cockroach, identify the parts of the foregut in correct sequence :-
A
Mouth → Oesophagus → Pharynx → Crop → Gizzard
B
Mouth → Crop → Pharynx → Oesophagus → Gizzard
C
Mouth → Gizzard → Crop → Pharynx → Oesophagus
D
Mouth → Pharynx → Oesophagus → Crop → Gizzard
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Match the following columns with reference to cockroach and select the correct option:
Column-I
Column-II
(A)Grinding of the food particles
(I)Hepatic caecal
(B)Secrete gastric juice
(II)10th segment
(C)10 pairs
(III)Proventriculus
(D)Anal cerci
(IV)Spiracles
(V)Alary muscles
Choose the correct answer from the options given below:
A
(A)-(III), (B)-(I), (C)-(IV), (d)-(II)
B
(A)-(IV), (B)-(III), (C)-(V), (d)-(II)
C
(A)-(I), (B)-(IV), (C)-(III), (d)-(II)
D
(A)-(II), (B)-(III), (C)-(I), (d)-(IV)
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Inclusion bodies of blue-green, purple and green
photosynthetic bacteria are:
A
Contractile vacuoles
B
Gas vacuoles
C
Centrioles
D
Microtubules
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The biosynthesis of ribosomal RNA occurs in:
A
Ribosomes
B
Golgi apparatus
C
Microbodies
D
Nucleolus
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Match the following columns and select the correct option:
Column-I
Column-II
(A)Smooth endoplasmic reticulum
(I)Protein synthesis
(B)Rough endoplasmic reticulum
(II)Lipid synthesis
(C)Golgi complex
(III)Glycosylation
(D)Centriole
(IV)Spindle formation
A
(A)-(II), (B)-(I), (C)-(III). (D)-(IV)
B
(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
C
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
D
(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
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Which of the following elements helps in maintaining the structure of ribosomes?
A
Magnesium
B
Zinc
C
Copper
D
Molybdenum
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Explanation: Magnesium (Mg2+) helps maintain the structure of ribosomes by stabilizing rRNA and ribosomal subunits, which is essential for proper protein synthesis. This is in line with NCERT, which notes the importance of Mg2+ in ribosome stability during translation. The other elements—Zinc, Copper, and Molybdenum—are involved in different cellular functions (enzymes and electron transport) but are not described as maintaining ribosome structure in NCERT.
🧠 Did You Know? Ribosomes require divalent cations like magnesium to maintain their shape and function during protein production.
💡 NCERT Memory Line: Magnesium stabilizes ribosomal structure for translation.
