NEET Biology Morphology of Flowering Plants MCQs Set 17

Multiple Choice Questions (MCQs) for NEET Biology: Morphology Of Flowering Plants

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Multiple Choice Questions

Question 1: In Australian acacia, the leaves are small and short lived and the petiole becomes a leafy structure that performs photosynthesis. This is a
(a) phyllode
(b) phylloclade
(c) cladode
(d) tendril
Show Answer & Explanation

Answer: (a) phyllode

Explanation:
1. A phyllode is a flattened petiole acting as a leaf.

Teacher's Note:
1. A phylloclade is a modified stem.

Question 2: A flower is a modified
(a) root
(b) shoot
(c) leaf only
(d) bud scale
Show Answer & Explanation

Answer: (b) shoot

Explanation:
1. The floral axis is a shoot with condensed nodes bearing floral appendages.

Teacher's Note:
1. The arrangement of flowers is inflorescence.

Question 3: In racemose inflorescence,
(a) the main axis continues to grow and flowers open in acropetal order
(b) the main axis ends in a flower
(c) flowers are in basipetal order
(d) flowers are always sessile on the thalamus
Show Answer & Explanation

Answer: (a) the main axis continues to grow and flowers open in acropetal order

Explanation:
1. In racemose types, younger flowers are towards the tip.

Teacher's Note:
1. In cymose, the main axis ends in a flower and the order is basipetal.

Question 4: When calyx and corolla are not distinct, the floral whorl is called
(a) perigynium
(b) spathe
(c) bract
(d) perianth
Show Answer & Explanation

Answer: (d) perianth

Explanation:
1. Lily has a perianth made of tepals.

Teacher's Note:
1. Perianth is a single whorl.

Question 5: A flower with both stamens and carpels is
(a) bisexual
(b) unisexual
(c) asymmetric
(d) incomplete only
Show Answer & Explanation

Answer: (a) bisexual

Explanation:
1. Bisexual flowers are also called hermaphrodite.

Teacher's Note:
1. Unisexual flowers have either stamens or carpels.

Question 6: Which is zygomorphic?
(a) Mustard
(b) Datura
(c) Chilli
(d) Pea
Show Answer & Explanation

Answer: (d) Pea

Explanation:
1. Pea and bean flowers can be divided into two equal halves in only one vertical plane, so they are zygomorphic.

Teacher's Note:
1. Mustard, Datura and chilli are actinomorphic, Canna asymmetric.

Question 7: In perigynous flowers the ovary is
(a) superior
(b) completely inferior
(c) half inferior
(d) absent
Show Answer & Explanation

Answer: (c) half inferior

Explanation:
1. The margin of thalamus grows upward around the ovary, making it half inferior.

Teacher's Note:
1. Rose and plum are examples.

Question 8: Calotropis shows which aestivation?
(a) Twisted
(b) Valvate
(c) Imbricate
(d) Vexillary
Show Answer & Explanation

Answer: (b) Valvate

Explanation:
1. The petals just touch each other at margins without overlapping.

Teacher's Note:
1. Pea shows vexillary aestivation.

Question 9: A sterile stamen is called
(a) anther
(b) filament
(c) connective
(d) staminode
Show Answer & Explanation

Answer: (d) staminode

Explanation:
1. Staminodes do not produce pollen.

Teacher's Note:
1. Epipetalous stamens are attached to petals.

Question 10: Match stamen condition: monoadelphous, diadelphous, polyadelphous
(a) pea, China rose, citrus respectively
(b) China rose, pea, citrus respectively
(c) citrus, pea, China rose respectively
(d) China rose, citrus, pea respectively
Show Answer & Explanation

Answer: (b) China rose, pea, citrus respectively

Explanation:
1. China rose has stamens in one bundle, pea in two bundles and citrus in many bundles.

Teacher's Note:
1. Lily has epipetalous stamens.

Question 11: In rose and lotus the carpels are
(a) apocarpous
(b) syncarpous
(c) monocarpellary
(d) absent
Show Answer & Explanation

Answer: (a) apocarpous

Explanation:
1. Free carpels are apocarpous.

Teacher's Note:
1. Mustard and tomato have syncarpous carpels.

Question 12: The arrangement of ovules within the ovary is called
(a) aestivation
(b) phyllotaxy
(c) placentation
(d) venation
Show Answer & Explanation

Answer: (c) placentation

Explanation:
1. Types: marginal, axile, parietal, free central and basal.

Teacher's Note:
1. Pea has marginal placentation.

Question 13: The ovary of mustard is one chambered but becomes two chambered because of
(a) a true septum
(b) the thalamus
(c) a false septum
(d) the style
Show Answer & Explanation

Answer: (c) a false septum

Explanation:
1. A false septum forms in parietal placentation of mustard and Argemone.

Teacher's Note:
1. This is NCERT line.

Question 14: A fruit developed without fertilisation of the ovary is
(a) drupe
(b) pome
(c) parthenocarpic
(d) berry
Show Answer & Explanation

Answer: (c) parthenocarpic

Explanation:
1. Parthenocarpy gives seedless fruits, as in banana.

Teacher's Note:
1. Normally fruit develops from ovary after fertilisation.

Question 15: Mango and coconut are examples of
(a) berry
(b) pome
(c) capsule
(d) drupe
Show Answer & Explanation

Answer: (d) drupe

Explanation:
1. Drupes develop from monocarpellary superior ovaries and have a hard stony endocarp.

Teacher's Note:
1. Mesocarp is fleshy in mango and fibrous in coconut.

Question 16: The edible part of a mango fruit is the
(a) mesocarp
(b) endocarp
(c) epicarp
(d) seed coat
Show Answer & Explanation

Answer: (a) mesocarp

Explanation:
1. The fleshy mesocarp of mango is eaten, the stony endocarp encloses the seed.

Teacher's Note:
1. In coconut the mesocarp is fibrous and the endosperm is edible.

Question 17: The seed coat has two layers, the outer and inner layers called respectively
(a) testa and tegmen
(b) tegmen and testa
(c) pericarp and testa
(d) aleurone and testa
Show Answer & Explanation

Answer: (a) testa and tegmen

Explanation:
1. Testa is the hard outer layer and tegmen the thin inner layer.

Teacher's Note:
1. Embryo has plumule, radicle and cotyledons.

Question 18: In cereal grains such as maize, the seed coat is
(a) free from the fruit wall
(b) absent
(c) fused with the fruit wall
(d) thicker than endosperm
Show Answer & Explanation

Answer: (c) fused with the fruit wall

Explanation:
1. In monocots the fruit is a caryopsis with seed coat fused with the fruit wall.

Teacher's Note:
1. This is why we call it a grain.

Question 19: In maize, the proteinaceous layer that separates the endosperm from the embryo is the
(a) scutellum
(b) coleoptile
(c) aleurone layer
(d) coleorhiza
Show Answer & Explanation

Answer: (c) aleurone layer

Explanation:
1. The aleurone layer surrounds the endosperm.

Teacher's Note:
1. The scutellum is the single shield shaped cotyledon.

Question 20: In monocot seeds the plumule and radicle are enclosed in sheaths called respectively
(a) coleoptile and coleorhiza
(b) coleorhiza and coleoptile
(c) scutellum and aleurone
(d) testa and tegmen
Show Answer & Explanation

Answer: (a) coleoptile and coleorhiza

Explanation:
1. Coleoptile covers the plumule and coleorhiza covers the radicle.

Teacher's Note:
1. Remember: P with C for coleoptile, R with coleorhiza.

Question 21: Papilionatae is a subfamily of
(a) Solanaceae
(b) Liliaceae
(c) Brassicaceae
(d) Leguminosae
Show Answer & Explanation

Answer: (d) Leguminosae

Explanation:
1. Fabaceae (Papilionoideae) is a subfamily of Leguminosae.

Teacher's Note:
1. Soyabean, moong and Lupinus belong to it.

Question 22: Which feature is associated with the Solanaceae and not Liliaceae?
(a) Perianth
(b) Epitepalous condition
(c) Persistent calyx
(d) Bulbs and corms
Show Answer & Explanation

Answer: (c) Persistent calyx

Explanation:
1. Solanaceae shows persistent calyx and a swollen placenta with many ovules.

Teacher's Note:
1. Tomato, potato and petunia belong to Solanaceae.

Question 23: The floral formula of onion is
(a) K(5) C(5) A5 G(2)
(b) Br Actinomorphic P(3+3) A3+3 G(3)
(c) K2+2 C4 A2+4 G(2)
(d) K(5) C1+2+(2) A(9)+1 G1
Show Answer & Explanation

Answer: (b) Br Actinomorphic P(3+3) A3+3 G(3)

Explanation:
1. Onion is in Liliaceae with perianth of 3+3 tepals, 3+3 stamens and a tricarpellary syncarpous ovary.

Teacher's Note:
1. Liliaceae members often have bulbs, corms or rhizomes.

Question 24: The fruit of Liliaceae is
(a) a legume
(b) a drupe
(c) a siliqua
(d) a capsule, rarely a berry
Show Answer & Explanation

Answer: (d) a capsule, rarely a berry

Explanation:
1. Liliaceae mostly bear capsules.

Teacher's Note:
1. Fabaceae bear legumes.

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