Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Shell of molluscs is derived from

  • foot

  • mantle

  • ctenidia

  • placoid


B.

mantle

Molluscs are the soft bodied, unsegmented animals covered by a shell. Mantle is the dorsal body wall which covers the organs of digestion, reproduction and movement. In between the shell and body wall is a covering called mantle, which secretes the shell.


12.

Action potential is generated by

  • Na+

  • K+

  • Ca+

  • Cl-


A.

Na+

Action potential refers to the electrical potential difference across an axon membrane, that is stimulated (action). Action potential is generated by Na+.

It occurs when the membrane potential of a specific axon location rapidly rises and falls. And this depolarisation leads to the adjacent locations to similary depolarize.


13.

Ligament is mainly made up of

  • reticulin

  • elastin

  • myosin

  • collagen


D.

collagen

Ligament is a tough cord or fibrous band of dense regular connective tissue that contains numerous parallel arrangements of collagen fibres. It connects bones or cartilages and serves to strengthen joints.


14.

Mitotic spindle have main protein

  • tubulin

  • myosin

  • tropomyosin

  • dynein


A.

tubulin

The mitotic spindle is a highly dynamic molecular machine composed of tubulin, motors and other molecules. It assembles around the chromosomes and distributes the duplicated genome to the daughter cells during mitosis

Microtubules are unbranched, hollow, sub- microscopic tubules, which form the structural material of cilia, flagella, basal bodies, centrioles and spindle apparatus. They are built up protofilaments, formed of two related proteins, α and β- tubulins. 


15.

Indian rhinoceros are protected in

  • Gir forest

  • Kaziranga National Park

  • Bandipur National Park

  • Ranthambore National Park


B.

Kaziranga National Park

Rhino (Rhinoceros unicomis) are protected in Kaziranga National Park. This park is situated in Assam.

Gir National Park protects Lions and is situated in Gujarat.

Bandipur National Park is a tiger reserve located in Karnataka.

Ranthambore National Park is also a tiger reserve known for protecting Bengal tigers and is situated in Rajasthan.


16.

Crossing over occurs in

  • zygotene

  • leptotene

  • pachytene

  • diplotene


C.

pachytene

Crossing overie, exchange of segments between non- sister chromatids of homologous chromosome occurs in pachytene stage of Prophase- I of Meiosis- I.


17.

Secretion of pancreatic juice is stimulated by

  • gastrin

  • secretin

  • enterogasteron

  • enterokinase


B.

secretin

The secretion of Pancreatic juice is stimulated by secretin and cholecystokinin (CCK). Both the hormones are secreted in response to different stimuli and have different effects on the composition of pancreatic juice.


18.

Connecting link between annelids and molluscs is

  • Neopilina

  • Peripatus

  • Periplaneta

  • Limulus


A.

Neopilina

Neopilina (mollusc) is considered as a connecting link between Annelida and Mollusca.


19.

A man of 'A' blood group marries a woman of 'AB' blood group. Which type of progeny would indicate that man is heterozygous?

  • O

  • B

  • A

  • AB


B.

B

In this case, progeny with blood group- B is produced only when man is heterozygous, ie, IAIO.


20.

Aqueous and vitreous humour are divided by

  • lens

  • iris

  • retina

  • optic nerve


A.

lens

Lens is a transparent, biconvex, elastic structure that bends light waves as they pass through its surface. The lens separates the aqueous and vitreous humours.