NEET Biology Anatomy of Flowering Plants MCQs Set 09

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Multiple Choice Questions

Question 1: Meristematic tissue responsible for increase in girth of tree trunk is
(a) Apical meristem
(b) Intercalary meristem
(c) Lateral meristem
(d) Phellogen
Show Answer & Explanation

Answer: (c) Lateral meristem

Explanation:
1. Apical and intercalary meristem are responsible for increase in length.
2. Vascular cambium responsible for increase in girth Cork cambium Apical Intercalary meristem Lateral meristem.

Question 2: Axillary bud and terminal bud are derived from the activity of
(a) Lateral meristem
(b) Intercalary meristem
(c) Apical meristem
(d) Parenchyma
Show Answer & Explanation

Answer: (c) Apical meristem

Explanation:
1. These are left over meristematic cells of apical meristem.

Question 3: Procambium is situated just behind apical meristem. Procambium gives rise to
(a) Primary vascular bundle
(b) Fascicular cambium
(c) Cork cambium
(d) Both (1) & (2)
Show Answer & Explanation

Answer: (d) Both (1) & (2)

Explanation:
1. Procambium give rise to primary meristem and primary vascular bundles.

Question 4: The apical meristem of the root is present
(a) Only in radicals
(b) Only in tap roots
(c) Only in adventitious roots
(d) In all the roots
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Answer: (d) In all the roots

Explanation:
1. Apical meristem add new cells to root.

Question 5: Which of the following is not true about ‘sclereids’?
(a) These are groups of living cells
(b) These are found in nut shells, guava pulp, pear
(c) These are also called stone cells
(d) These are form of sclerenchyma
Show Answer & Explanation

Answer: (a) These are groups of living cells

Explanation:
1. These are dead elements of sclerenchyma.
2. Rest all statements are correct.

Question 6: Chlorenchyma is known to develop in the
(a) Cytoplasm of Chlorella
(b) Mycelium of a green mould such as Aspergillus
(c) Capsule of a moss
(d) Pollen tube of Pinus
Show Answer & Explanation

Answer: (c) Capsule of a moss

Explanation:
1. This is so because it needs mechanical support whereas Chlorenchyma can never develop in cytoplasm, mycelium or pollen tube.

Question 7: Casparian strip occurs in
(a) Endodermis
(b) Exodermis
(c) Pericycle
(d) Epidermis
Show Answer & Explanation

Answer: (a) Endodermis

Explanation:
1. Cells of endodermis in roots get suberised and become impervious which is known as casparian strip Caspasian strip . Endodermis.

Question 8: Vascular bundles in monocotyledons are considered closed because
(a) Xylem is surrounded all around by phloem
(b) There are no vessels with perforations
(c) A bundle sheath surrounds each bundle
(d) There is no secondary growth
Show Answer & Explanation

Answer: (d) There is no secondary growth

Explanation:
1. This is so because they lack cambium ∴ (Cambium possess meristematic activity) Phloem No cambium Xylem.

Question 9: What happens in plants during vascularisation?
(a) Differentiation of procambium, formation of primary phloem followed by formation of primary xylem
(b) Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously
(c) Formation of procambium, secondary phloem and xylem simultaneously
(d) Differentiation of procambium followed by the formation of secondary xylem
Show Answer & Explanation

Answer: (b) Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously

Explanation:
1. This option, Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously, is the one that agrees with the standard NCERT facts for this topic.

Question 10: Four radial vascular bundles are found in
(a) Dicot root
(b) Monocot root
(c) Dicot stem
(d) Monocot stem
Show Answer & Explanation

Answer: (a) Dicot root

Explanation:
1. This is so because radial condition will always be found in root and in dicot there 2-6 vascular bundles usually called tetrach whereas in monocots it is more that six called polyarch.

Question 11: In which of the following plant sunken stomata are found?
(a) Nerium
(b) Hydrilla
(c) Mango
(d) Guava
Show Answer & Explanation

Answer: (a) Nerium

Explanation:
1. This is so because nerium is a xerophytic plant and sunken stomata is a xerophytic adaptation to reduce water loss through transpiration.
2. Whereas → Hydrilla is hydrophytic plant and guava and mango are mesophytic plant.

Question 12: In an annual ring, the light coloured part is known as
(a) Early wood
(b) Late wood
(c) Heartwood
(d) Sapwood
Show Answer & Explanation

Answer: (a) Early wood

Explanation:
1. Light coloured wood is called spring wood because in order to take care of excess transpiration in spring season, large xylary elements and broader vessels are produced.
2. So, light in colour and density.
3. Late wood : Autumn wood because of less transpiration has small sized xylary elements and narrower vessel therefore dark coloured.
4. Sap wood : Newly formed secondary xylem.

Question 13: Diffuse porous woods are characteristic of plants growing in
(a) Alpine region
(b) Cold winter regions
(c) Temperate climate
(d) Tropics
Show Answer & Explanation

Answer: (d) Tropics

Explanation:
1. This is so because tropics exhibit hot climate, thus, there is increase rate of transpiration which is maintained by more number of vessels.

Question 14: Lenticels are involved in
(a) Gaseous exchange
(b) Food transport
(c) Photosynthesis
(d) Transpiration
Show Answer & Explanation

Answer: (a) Gaseous exchange

Explanation:
1. Food transport → Phloem Photosynthesis → Tissues containing chloroplasts e.g., Parenchyma, Collenchyma Transpiration → Stomata.

Question 15: Assertion (A): Endodermis is present between general cortex and pericycle in maize stem.
Reason (R): Eustele is present in maize stem.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. In maize endodermis is not distinct because it is a monocot.
2. Atactostele is present in monocot e.g., in maize.

Question 16: Assertion (A): Bast fibres are collenchymatous fibres.
Reason (R): Fibres are absent in secondary phloem.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Bast fibres are phloem fibres.
2. Fibres are present in secondary phloem.

Question 17: Assertion (A): Oldest layer of sapwood lies just outside vascular cambium.
Reason (R): Sapwood contains actively conducting vessels and occupies central part of stem.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. Oldest layer of sapwood will lie close intact in pith.
2. Heartwood occupies central portion.

Question 18: Assertion (A): Bark is all the tissue outside steler cambium.
Reason (R): Bark is formed due to the activity of phellogen only.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Bark also includes phloem which is formed by vascular cambium.

Question 19: Assertion (A): According to Clowes, there are three histogens in monocot root.
Reason (R): In dicot roots, innermost groups of initials form root cap.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. According to Hanstein there are three histogen in monocot root.
2. In dicot root, innermost group of cell form central stele.

Question 20: Assertion (A): Intercalary meristems are commonly located at the base of leaves, above the nodes or below the nodes.
Reason (R): Vacuoles are large sized in the cells of intercalary meristem.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Vacuoles are small sized in the cells of intercalary meristem.
2. They are large sized in the cells of elongation phase.

Question 21: Assertion (A): Cells of sclerenchyma have thickened secondary walls.
Reason (R): Cells have deposition of lignin.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.

Explanation:
1. Sclerenchyma has lignified cell wall.

Question 22: Assertion (A): In monocot roots, pericycle gives rise to lateral roots and cork cambium.
Reason (R): It has tetrach vascular bundles usually.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (d) Both Assertion and Reason are false.

Explanation:
1. In monocots roots pericycle does not give rise lateral roots and cork cambium.
2. It has polyarch vascular bundles.

Question 23: Assertion (A): Complementary cells are cut-off by phellogen towards outside.
Reason (R): Phellogen is partially secondary in origin.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (c) Assertion is true but the Reason is false.

Explanation:
1. Phellogen is completely secondary in origin.

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