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 sugars is not plants?

• sucrose

• glucose

• lactose

• fructose

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

17.

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 $\mathrm{\alpha }$- ketoglutaric acid

• malic acid to oxaloacetic acid

Which ofthe following is true regarding the given electron transport chain?

CoQ $\to$Cyt c $\to$Cyt aa₃ $\to$O₂

• CoQ $\to$Cyt c is H⁺ absorbing site

• aa₃ $\to$O₂, H⁺ yielding site

• CoQ $\to$Cyt c is H⁺ yielding site and aa₃ $\to$O₂ is H⁺ absorbing site

• No H⁺ is absorbed or released

Which one of the following is not a microelement for plants?

• Cu

• B

• Zn

• Cr