CBSE Class 11 Biology Anatomy of Flowering Plants Assignments

Question. Stomata in grass leaf are
(a) dumb-bell shaped
(b) kidney-shaped
(c) rectangular
(d) barrel-shaped.
Answer. A

Question. Specialised epidermal cells surrounding the guard cells are called
(a) bulliform cells
(b) lenticels
(c) complementary cells
(d) subsidiary cells.
Answer. D

Question. Vascular bundles in monocotyledons are considered closed because
(a) there are no vessels with perforations
(b) xylem is surrounded all around by phloem
(c) a bundle sheath surrounds each bundle
(d) cambium is absent. 
Answer. D

Question. Which of the following statements is not true for stomatal apparatus?
(a) Guard cells invariably possess chloroplasts and mitochondria.
(b) Guard cells are always surrounded by subsidiary cells.
(c) Stomata are involved in gaseous exchange.
(d) Inner wall of guard cells are thick.
Answer. B

Question. Closed vascular bundles lack
(a) ground tissue
(b) conjunctive tissue
(c) cambium
(d) pith.
Answer. C

Question. Ground tissue includes
(a) all tissues external to endodermis
(b) all tissues except epidermis and vascular bundles
(c) epidermis and cortex
(d) all tissues internal to endodermis.
Answer. B

Question. Some vascular bundles are described as open because these
(a) are surrounded by pericycle but no endodermis
(b) are capable of producing secondary xylem and phloem
(c) possess conjunctive tissue between xylem and phloem
(d) are not surrounded by pericycle.
Answer. B

Question. In barley stem vascular bundles are
(a) closed and scattered
(b) open and in a ring
(c) closed and radial
(d) open and scattered.
Answer. A

Question. A bicollateral vascular bundle is characterised by
(a) phloem being sandwiched between xylem
(b) transverse splitting of vascular bundle
(c) longitudinal splitting of vascular bundle
(d) xylem being sandwiched between phloem.
Answer. D

Question. The transverse section of a plant shows following anatomical features :
(i) Large number of scattered vascular bundles surrounded by bundle sheath
(ii) Large conspicuous parenchymatous ground tissue
(iii) vascular bundles conjoint and closed
(iv) phloem parenchyma absent
Identify the category of plant and its part.
(a) Monocotyledonous stem
(b) Monocotyledonous root
(c) Dicotyledonous stem
(d) Dicotyledonous root 
Answer. A

Question. Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following.
(a) Tyloses in vessels
(b) Closure of stomata
(c) Flaccidity of bulliform cells
(d) Shrinkage of air spaces in spongy mesophyll
Answer. C

Question. In the dicot root the vascular cambium originates from
(a) tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem
(b) cortical region
(c) parenchyma between endodermis and pericycle
(d) intrafascicular and interfascicular tissue in a ring. 
Answer. A

Question. Casparian strips occur in
(a) epidermis
(b) pericycle
(c) cortex
(d) endodermis.
Answer. D

Question. Root hair develop from the region of
(a) elongation
(b) root cap
(c) meristematic activity
(d) maturation. 
Answer. D

Question. Cortex is the region found between
(a) epidermis and stele
(b) pericycle and endodermis
(c) endodermis and pith
(d) endodermis and vascular bundle.
Answer. A

Question. A major characteristic of monocot root is the presence of
(a) vasculature without cambium
(b) cambium sandwiched between phloem and xylem along the radius
(c) open vascular bundles
(d) scattered vascular bundles. 
Answer. A

Question. You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
(a) Secondary xylem
(b) Secondary phloem
(c) Protoxylem
(d) Cortical cells 
Answer. C

Question. Water containing cavities in vascular bundles are found in
(a) sunflower
(b) maize
(c) Cycas
(d) Pinus.
Answer. B

Question. As compared to a dicot root, a monocot root has
(a) more abundant secondary xylem
(b) many xylem bundles
(c) inconspicuous annual rings
(d) relatively thicker periderm. 
Answer. B


Question. Palisade parenchyma is absent in leaves of
(a) mustard
(b) soybean
(c) gram
(d) Sorghum. 
Answer. D

Question. The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is
(a) elongating
(b) widening
(c) differentiating
(d) maturing. 
Answer. C

Question. Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
(a) absence of secondary phloem
(b) presence of cortex
(c) position of protoxylem
(d) absence of secondary xylem.
Answer. C

Question. Passage cells are thin walled cells found in
(a) phloem elements that serve as entry points for substance for transport to other plant parts
(b) testa of seeds to enable emergence of growing embryonic axis during seed germination
(c) central region of style through which the pollen tube grows towards the ovary
(d) endodermis of roots facilitating rapid transpor of water from cortex to pericycle. 
Answer. D

Question. In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?
(a) All parts
(b) Stem and root
(c) Flowers, fruits and leaves
(d) Shoot tips and root tips 
Answer. D

Question. Four radial vascular bundle are found in
(a) dicot root
(b) monocot root
(c) dicot stem
(d) monocot stem. 
Answer. A

Question. 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, primary phloem and xylem simultaneously
(d) Differentiation of procambium followed by the formation of secondary xylem 
Answer. B

Question. Casparian strips are found in
(a) epidermis
(b) hypodermis
(c) periderm
(d) endodermis. 
Answer. D

Question. Casparian strip occurs in a
(a) endodermis
(b) exodermis
(c) pericycle
(d) epidermis. 
Answer. A

Question. A plant bears fruit, has a column of vascular tissue and a tap root system. This plant is a
(a) angiosperm and dicot
(b) gymnosperm and dicot
(c) angiosperm and monocot
(d) gymnosperm and monocot. 
Answer. A

Question. Where do the Casparian bands occur?
(a) Epidermis
(b) Endodermis
(c) Pericycle
(d) Phloem 
Answer. B

Question. A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
(a) cork cambium
(b) vascular cambium
(c) endodermis
(d) pericycle.
Answer. B