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NEET Biology 2021 PYQs
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100 questions in NEET 2021
Which of the following algae produce Carrageen?
A
Green algae
B
Brown algae
C
Red algae
D
Blue-green algae
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Genera like Selaginella and Salvinia produce two
kinds of spores. Such plants are known as:
A
Homosorus
B
Heterosorus
C
Homosporous
D
Heterosporous
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Which of the following algae contains mannitol as
reserve food material?
A
Ectocarpus
B
Gracilaria
C
Volvox
D
Ulothrix
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Gemmae are present in:
A
Mosses
B
Pteridophytes
C
Some Gymnosperms
D
Some Liverworts
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Explanation: Gemmae are asexual reproductive bodies found in some liverworts. They develop in structures called gemmae cups and help in rapid, clonal propagation. This aligns with NCERT's description of liverworts using gemmae for reproduction.
🧠 Did You Know? Gemmae are a common feature of many liverworts, not mosses or Pteridophytes, and are not a typical feature of gymnosperms.
💡 NCERT Memory Line: “Gemmae cups are present in some liverworts for asexual reproduction.”
Diadelphous stamens are found in:
A
China rose
B
Citrus
C
Pea
D
China rose and citrus
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Match List-I with List-II.
List-I
List-II
(A)Lenticels
(I)Phellogen
(B)Cork cambium
(II)Suberin deposition
(C)Secondary cortex
(III)Exchange of gases
(D)Cork
(IV)Phelloderm
Choose the correct answer from the options given below:
A
A-III, B-I, C-IV, D-II
B
A-II, B-III, C-IV, D-I
C
A-IV, B-II, C-I, D-III
D
A-IV, B-I, C-III, D-II
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Match List-I with List-II.
List-I
List-II
(A)Cells with active cell division capacity
(I)Vascular tissues
(B)Tissue having all cells similar in structure and function
(II)Meristematic tissue
(C)Tissue having different types of cells
(III)Sclereids
(D)Dead cells with highly thickened walls and narrow lumen
(IV)Simple Tissue
Choose the correct answer from the options given below:
A
A-IV, B-III, C-II, D-I
B
A-I, B-II, C-III, D-IV
C
A-III, B-II, C-IV, D-I
D
A-II, B-IV, C-I, D-III
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Which of the following is an incorrect statement?
A
Mature sieve tube elements possess a
conspicuous nucleus and usual cytoplasmic
organelles.
B
Microbodies are present both in plant and animal
cells.
C
The perinuclear space forms a barrier between
the materials present inside the nucleus and that
of the cytoplasm.
D
Nuclear pores act as passages for proteins and
RNA molecules in both directions between nucleus and cytoplasm.
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Explanation: Option 1 is incorrect. Mature sieve tube elements lack a nucleus and have very few cytoplasmic organelles; they rely on companion cells for metabolic needs. This is described in NCERT in the discussion of phloem tissue.
🧠 Did You Know? Companion cells support sieve tube elements and help with loading/unloading of substances in phloem.
💡 NCERT Memory Line: Mature sieve tube elements are enucleate and devoid of usual organelles; their metabolic functions are supported by companion cells.
Match List-I with List-II.
List-I
List-II
(A)Cristae
(I)Primary constriction in chromosome
(B)Thylakoids
(II)Disc-shaped sacs in Golgi apparatus
(C)Centromere
(III)Infoldings in mitochondria
(D)Cisternae
(IV)Flattened membranous sacs in stroma of plastids
Choose the correct answer from the options given below:
A
A-I, B-IV, C-III, D-II
B
A-III, B-IV, C-I, D-II
C
A-II, B-III, C-IV,D-I
D
A-IV, B-III, C-II, D-I
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When the centromere is situated in the middle of
two equal arms of chromosomes, the chromosome
is referred as:
A
Metacentric
B
Telocentric
C
Sub-metacentric
D
Acrocentric
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