Bark refers to
phellem + phellogen + phelloderm
periderm + cortex
phellem + phelloderm + secondary phloem
periderm + cortex + pericycle + secondary phloem
The outermost limiting layer of mycoplasma is made up of
cell wall
cell membrane
mucilaginous sheath
slime layer
Which of the following statements about Spirogyra is correct?
Lateral conjugation takes place in homothallic species
Scalariform conjugation takes place in homothallic species.
Lateral conjugation takes place in heterothallic species
The type of conjugation is unrelated to homothallic and heterothallic species
Which of the following is true?
Umbel is a racemose inflorescence where all stalked flower aggregate on the flat receptacle
Raceme is a racemose inflorescence having main axis shortened & flower born acropetally
Spadix is a racemose inflorescence having pendulous spike with main axis much flattened.
Spike is a racemose inflorescence having sessile flowers
Jute fibres deteriorate quickly because
cellulose content is high
lignin content is high
cellulose content is low
lignin content is low
The branched sclereids present in hydrophytes are
osteosclereids
trichosclereids
macrosclereids
astrosclereids
The enzyme decarboxylase catalyses the following step
conversion of citric acid to cis aconitic acid
fumaric acid to malic acid
oxalosuccinic acid to - ketoglutaric acid
malic acid to oxaloacetic acid
Which ofthe following is true regarding the given electron transport chain?
CoQ Cyt c Cyt aa3 O2
CoQ Cyt c is H+ absorbing site
aa3 O2, H+ yielding site
CoQ Cyt c is H+ yielding site and aa3 O2 is H+ absorbing site
No H+ is absorbed or released
C.
CoQ Cyt c is H+ yielding site and aa3 O2 is H+ absorbing site
In electron transport chain electrons transport through a series of carriers. H+ of NADH+ (received from Kreb' s cycle) is accepted by FAD as a result of which FAD is reduced to FADH+ and NADH+ is oxidised to NAD. Reduced FADH+ is oxidised by CoQ with the formation of CoQH+. H+ ions then move to Cyt b, then Cyt c, Cyt a and Cyt aa3. Ultimately these H+ are acceped by O2 and H2O is formed.