Direction : In the following questions, a statement of assertion
is followed by a statement of reason. Mark the correct choice
as :
(a) If both assertion and reason are true and reason is the
correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the
correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false.
ANATOMY OF FLOWERING PLANTS- Assertion : all parts of the reproductive shoot apex show
meristematic activity.
Reason : reproductive shoot apex is generally protected
by sepals. - Assertion : root apical meristem is subterminal.
Reason : root apex is covered by root cap. - Assertion : aquatic plants consist of special
parenchymatous tissue called aerenchyma which provides
buoyancy to them.
Reason : aerenchyma consists of network of parenchyma
cells that enclose large air cavities which store air and make
aquatic plants light and buoyant. - Assertion : Secondary phloem shows an irregular
arrangement of various types of cells formed from
procambium of apical meristem.
Reason : Secondary phloem is found in the primary plant
body of all vascular plants. - Assertion : endodermis layer of dicot stem is also called
starch sheath.
Reason : endodermal cells often contain conspicuous
starch grains as food reserve.
6. Assertion : Dicotyledonous leaves are anatomically
isobilateral type.
Reason : a distinction into upper and lower surfaces is
absent in dicotyledonous leaves.
7. Assertion : Xylem of a dicot stem is endarch.
Reason : Protoxylem lies towards the centre and the
metaxylem lies towards the periphery in a dicot stem.
8. Assertion : Heartwood is stronger and more durable than
the sapwood.
Reason : Plant products like oils, resins, gums, aromatic
substances, essential oils and tannins are deposited in the
cells of the sapwood.
9. Assertion : Interfascicular cambium is a secondary
meristem.
Reason : Interfascicular cambium develops from
permanent cells of medullary rays through the process of
dedifferentiation.
10. Assertion : annual rings are not produced in secondary
phloem.
Reason : Secondary phloem is traversed by radial system
of phloem rays.
11. Assertion : Some leaves are hypostomatic.
Reason : In hypostomatic leaves, stomata are present on
both adaxial and abaxial surfaces.
12. Assertion : During secondary growth, secondary xylem is
produced more than secondary phloem.
Reason : The cambium is generally more active on the
inner side than on the outer.
13. Assertion : Collenchyma cells are living and can store food
as well as take part in photosynthesis.
Reason : Wall thickening in collenchyma cells is uniform.
ANATOMY OF FLOWERING PLANTS
MOLECULAR BASIS OF INHERITANCEPRACTICE QUESTIONS ON
Assertion & Reason