Test Preparation on Morphology of plants - I Biology Test Series for NEET - 2020
If a primary root continues to grow, the type of root system
will be known as
Pneumatophores occur in plants of
(b) In plants growing in salty marshes some branches of tap
root grow vertically upwards into the air from
horizontally secondary roots. These roots are called
pneumatophores.
Roots developing from plant parts other than radical are
(c) In monocotyledonous plants the radicle dies
immediately after germination of seeds and later these
roots arise from any other portion (stem, leaves etc.) of
the plant.
In which the pneumatophores are found
(c) Pneumatophores develop from horizontal roots. They
bear a number of lenticels or pneumathodes. Exchange
of gases occurs through these pores. e.g., Rhizophora.
Which of the following is correctly matched
(a) Monstera – Fibrous root
(b) Dahlia – Fasciculated root
(c) Azadirachta – Adventitious root
(d) Basil – Prop roots
(b) Swollen adventitious roots of definite shape that occur
in groups or fascicles, and arise from base of stem e.g.
Dahlia.
Fusiform roots are found in
(d) The storage root is like a spindle, narrow towards both
base and apex. It occurs in Raphanus sativus. The basal
part of it is made of tap root.
A fibrous root system is better adapted than tap root
system for
(b) They are thin thread–like adventitious roots which often
develop in groups. Fibrous roots provide better and firm
anchorage to the plant, e.g., Grass.
Root cap is largest in
(a) In some plants roots arise from lower nodes of stem and
enter the soil to provide extra support. They behave as
ropes of a tent. Such roots are called stilt or brace roots
e.g., Pandanus.
Assimilatory (Photosynthetic) roots a characteristic of
(c) These roots develop chlorophyll and become
photosynthetic. They synthesize carbohydrates from
carbon dioxide and water in presence of light, e.g.,
Trapa, Tinospora, Taeniophyllum and podostemon.
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