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408 questions in Botany
Given below are two statements:Statement I: Parenchyma is living but collenchyma is dead tissue.Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of
angiosperms.
A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
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Explanation: In NCERT, parenchyma is living tissue at maturity, used for storage and photosynthesis. Collenchyma is also living with unevenly thickened cell walls, not dead; hence Statement I is false. Gymnosperms lack xylem vessels and have tracheids instead, while angiosperms have xylem vessels. Therefore, the statement βpresence of xylem vessels is the characteristic of angiospermsβ is true. So the correct choice is: Statement I is false and Statement II is true.
? Did You Know? Collenchyma is living and provides flexible support; sclerenchyma is dead and provides rigid support. Xylem vessels are characteristic of flowering plants (angiosperms).
? NCERT Memory Line: Parenchyma is living; collenchyma is living with thickened walls; sclerenchyma is dead. Angiosperms have xylem vessels; gymnosperms lack vessels and have tracheids.
List of endangered species was released by:
A
WWF
B
GEAC
C
IUCN
D
FOAM
Show explanation
Explanation: NCERT Page No.263,(Topic-15.1.4 Loss of Biodiversity)
The DNA present in chloroplast is:
A
Circular, double stranded
B
Linear, double stranded
C
Circular, single stranded
D
Linear, single stranded
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Explanation: NCERT Page No.136,(Topic-8.5.5 Plastids)
Which of the following are fused in somatic hybridization involving two varieties of plants?
A
Somatic embryos
B
Callus
C
Pollens
D
Protoplasts
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Explanation: NCERT Page No.178,(Topic-10.1 BIOTECHNOLOGICAL APPLICATIONS IN
AGRICULTURE)
Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
A
Gibberellin
B
Auxin
C
Abscisic acid
D
Cytokinin
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Explanation: NCERT Page No.176, (Topic-13.4.3.2 13.4.3.2 Gibberellins)
Match List-I with List-II:
List-I
List-II
A. Rose
I. Twisted aestivation
B. Pea
II. Perigynous flower
C. Cotton
III. Drupe
D. Mango
IV. Marginal placentation
Choose the correct answer from the options given below:
A
A-II, B-III, C-IV, D-I
B
A-IV, B-I, C-II, D-III
C
A-III, B-II, C-I, D-IV
D
A-III, B-IV, C-I, D-II
Show explanation
Explanation: NCERT Page No.84, (Topic-5.2 THE SEARCH FOR GENETIC MATERIAL)
Given below are two statements:Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 fixation is decreased.Statement II: In C4 plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
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Explanation: NCERT Page No.147, (Topic-11.9 PHOTORESPIRATION)
Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate:
A
Succinic acid β Malic acid
B
Malic acid β Oxaloacetic acid
C
Isocitrate β Ξ±-ketoglutaric acid
D
Succinyl-CoA β Succinic acid
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Explanation: NCERT Page No.158, (Topic-12.4.1 Tricarboxylic Acid Cycle)
Match List I with List II:
List-I
List-II
A.
Citric acid cycle
I.
Cytoplasm
B.
Glycolysis
II.
Mitochondrial matrix
C.
Electron transport system
III.
Intermembrane space of mitochondria
D.
Proton gradient
IV.
Inner mitochondrial membrane
Choose the correct answer form the options given
below:
A
A-III, B-IV, C-I, D-II
B
A-IV, B-III, C-II, D-I
C
A-I, B-II, C-III, D-IV
D
A-II, B-I, C-IV, D-III
Show explanation
Citric acid cycle - Mitochondrial matrix (NCERT Page No. 159).
Which of the following statement is correct regarding the process of replication in E.coli?
A
The DNA dependent RNA polymerase catalyses polymerization in one direction, that is 5' β 3'
B
The DNA dependent DNA polymerase catalyses polymerization in one direction that is 3' β 5'
C
The DNA dependent DNA polymerase catalyses polymerization in 5' β 3' direction.
D
The DNA dependent DNA polymerase catalyses polymerization in 5' β 3' as well as 3' β 5' direction
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NCERT Page No.90, (Topic-5.4.2 The Machinery and the Enzymes)
