Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Caudal vertebrae of man are united to form a single

  • synsacrum

  • pygostyle

  • coccyx

  • None of these


C.

coccyx

The bones of the tail, which articulate with the sacral vertebrae. The number of caudal vertebrae varies with the species. The coccyx is a triangular arrangement of bone that makes up the very bottom portion of the spine below the sacrum. It represents a vestigial tail, hence the common term tailbone.

Synsacrum and pygostyle are unique features of aves.


2.

Tube within tube plan is exhibited by which of the following groups of animals?

  • Arthropods

  • Cephalochordates

  • Annelids

  • Mollusca


C.

Annelids

Annelids have straight alimentary canal representing a tube within a tube plan. In deuterostomatic animals anus develops earlier during embryonic development from
blastopore (e.g., all chordates and echinoderm invertebrates).


3.

Digestion in Leucosolenia and other sponges is

  • only extracellular

  • only intracellular

  • first extracellular, then intracellular

  • first intracellular, then extracellular


B.

only intracellular

Digestion occurs in food vacuoles only, hence, it is  completely intracellular.


4.

Molluscan blood contains

  • haemoglobin

  • haemozoin

  • haemocyanin

  • All of these


C.

haemocyanin

Haemocyanin is the characteristic respiratory pigment of only Mollusca and some arthropods.


5.

Non-reducing sugars have

  • free CHO group and bound CO group

  • free CO group and bound CHO group

  • both CO and CHO free groups

  • neither free CO nor free CHO groups


D.

neither free CO nor free CHO groups

Non- reducing sugars lack free aldehyde or ketonic group and they do not reduce cupric ions of Benedict's or Fehling's solution to cuprous ions, e.g., sucrose.


6.

Leveret is young one of

  • eagle

  • hawk

  • deer

  • None of these


D.

None of these

Leveret is young one of a mammal (hare).


7.

The repeating unit in glycogen is

  • glucose

  • fructose

  • galactose

  • cellulose


A.

glucose

Glycogen is a polymer of D- glucose and is highly branched and the branching occurs in 10-12 glucose units. Hence, the repeating unit in glycogen is Glucose.


8.

Fluid mosaic model exhibits amphipathy because of

  • glycoproteins

  • phospholipids

  • lipids

  • glycolipids


B.

phospholipids

Fluid mosaic model exhibits amphipathy. It is due to phospholipids as they have both hydrophobic and hydrophilic groups.


9.

A cysticerous in pig muscles can remain alive for

  • six months

  • one year

  • six years

  • one month


C.

six years

Cysticerci remain alive for 5-6 years and are then calcified by the host (pig).


10.

Moulting in snakes is done by shedding

  • comified cells

  • stratified germinativum

  • epidermis

  • dermis


A.

comified cells

Stratum comeum is keratinized layer and is shed by snakes annually.