Multiple Choice Questions

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Ginger is an underground stem. It is distinguished from root because

  • it lacks chlorophyll

  • it stores food

  • it has nodes and internodes

  • it has xylem and vessels


C.

it has nodes and internodes

Underground stems can be differentiated from roots by

(i) Absence of root cap

(ii) Absence of root hair

(iii) Presence of terminal bud

(iv) Presence of nodes and internodes

(v) Occurrence of foilage or scale leaves on the nodes.


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Root hair absorbs water from soil through

  • turgor pressure

  • ion exchange

  • osmosis

  • DPD


A genophore is made up of 

  • a single double stranded DNA

  • a single stranded DNA

  • RNA and histones

  • histones and non- histones


In CAM plants, CO2 acceptor is

  • RuBP

  • PEP

  • OAA

  • PGA


Iodine is obtained from 

  • Laminaria

  • Chlorella

  • Polysiphonia

  • Porphyra


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During DNA replication in prokaryotes DNA is anchored to

  • chromosome

  • mesosome

  • nucleolus

  • ribosome


Which one of the following is a natural growth inhibitor?

  • NAA

  • ABA

  • IAA

  • GA


Apical dominance is caused by

  • auxin

  • gibberellin

  • kinetin

  • ABA


DCMU 

  • inhibits PS- I

  • inhibits PS- II

  • destroy chloroplast

  • inhibits oxidative phosphorylation


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Which of the following is not caused by deficiency of mineral?

  • Chlorosis

  • Etiolation

  • Shortening of internodes

  • Necrosis