Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Bark refers to

  • phellem + phellogen + phelloderm

  • periderm + cortex

  • phellem + phelloderm + secondary phloem

  • periderm + cortex + pericycle + secondary phloem


D.

periderm + cortex + pericycle + secondary phloem

Bark is a loose term and is used to define all the tissues outside vascular cambium. It is the outermost layer of stems and roots of woody plants. It is further differentiated into outer bark or rhytidome (consisting of dead cells) and inner bark (of living cells, i.e., periderm, cortex, pericycle and secondary phloem). The outer layer of the bark are being constantly peeled off on account of the formation of new secondary vascular tissues in the interior. Bark is insect repellent, decay proof, fire-proof and acts as a heat screen.


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12.

The outermost limiting layer of mycoplasma is made up of

  • cell wall

  • cell membrane

  • mucilaginous sheath

  • slime layer


13.

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


14.

Which of the following sugars is not plants?

  • sucrose

  • glucose

  • lactose

  • fructose


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15.

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


16.

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


18.

The enzyme decarboxylase catalyses the following step

  • conversion of citric acid to cis aconitic acid

  • fumaric acid to malic acid

  • oxalosuccinic acid to α- ketoglutaric acid

  • malic acid to oxaloacetic acid


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19.

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, Hyielding site

  • CoQ Cyt c is Hyielding site and aa3 O2 is H+ absorbing site

  • No H+ is absorbed or released


20.

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

  • Cu

  • B

  • Zn

  • Cr


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