Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Roots play insignificant role in absorption of water in

  • Sunflower

  • Pistia

  • Pea

  • Pea


B.

Pistia

Pistia is a hydrophyte where absorption of water by root is insignificant. 

1583 Views

12.

Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?

  • Antidiuretic hormone

  • Luteinizing hormone

  • Prolactin

  • Prolactin


A.

Antidiuretic hormone

Antidiuretic Hormone (ADH) or vasopressin is a peptide hormone synthesised in the hypothalamus, but stored and released from the posterior pituitary lobe. 

1183 Views

13.

The chitinous exoskeleton of arthropods is formed by the polymerisation of

  • Keratin sulphate and chondraitin sulphate

  • D-glucosamine

  • N-acetyl glucosamine

  • N-acetyl glucosamine


C.

N-acetyl glucosamine

The chitinous exoskeleton of arthropods is formed by the polymerisation of N-acetyl glucosamine, which  is a derivative of glucose. It is also a characteristic component of the cell wall of fungi, the radulae of molluscs and the beaks and internal shells of cephalopods including squid and octopuses. 

1388 Views

14.

The function of the gap junction is to

  • performing cementing to keep neighbouring cells together

  • facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.

  • separate two cells from each other

  • separate two cells from each other


B.

facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.

A gap junction may nexus or macula communicans. These are specialised intercellular connection between a multitude of animal cell-types. They directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells. 

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15.

Choose the wrong statement

  • Penicillium is multicellular and produces antibiotics

  • Neurospora is used in the study of biochemical genetics

  • Morels and truffles are poisonous mushrooms

  • Morels and truffles are poisonous mushrooms


C.

Morels and truffles are poisonous mushrooms

All statements are correct, except statement (c), which can be corrected as
Morels and truffles are edible and members of Ascomycetes in fungi.

972 Views

16.

Metagenesis refers to

  • Presence of different morphic forms

  • Alternation of generation between asexual and sexual phases of an organism

  • Occurrence of a drastic change in form during post-embyonic development

  • Occurrence of a drastic change in form during post-embyonic development


B.

Alternation of generation between asexual and sexual phases of an organism

Metagenesis is an organisation refers to the reproduction characterised by the alteration of a sexual generation and a generation that reproduces asexually, i.e., alternation of generations. 

1297 Views

17.

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:

  • Eptatretus

  • Myxine

  • Neomyxine

  • Neomyxine


D.

Neomyxine

Petromyzon(the lamprey) belongs to the section Agnatha of the sub-phylum-Vertebrata. They have long, greenish brown, cylindrical body with smooth scaleless, slimy skin, jawless mouth, etc. They lay eggs in freshwater but their ammocoete larvae(lower) after metamorphosis return to the ocean. 

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18.

Destruction of the anterior horn cells of the spinal cord would result in loss of

  • Sensory impulses

  • Voluntary motor impulses

  • Commissural impulses

  • Commissural impulses


B.

Voluntary motor impulses

Destruction of the anterior horn cells of the spinal cord would result in loss of voluntary motor impulses. It is because the anterior horn cells (also called anterior grey column), which is the front column of grey matter in the spinal cord contains motor neurons that affect the axial muscles. 

1714 Views

19.

Cell wall is absent in

  • Aspergillus

  • Funaria

  • Mycoplasma

  • Mycoplasma


C.

Mycoplasma

True or rigid cell wall is absent in mycoplasm, but their cytoplasm is surrounded by a tri-laminar (triple layered), highly elastic cell membrane of about 10nm in thickness.

1080 Views

20.

Which one is a wrong statement?

  • Archegonia are found in Bryophyta, Pteridophyta and Gymnosperms

  • Mucor has biflagellate zoospores

  • Haploid endosperm is typical feature of gymnosperms

  • Haploid endosperm is typical feature of gymnosperms


B.

Mucor has biflagellate zoospores

All the statements are correct except the statement (b). Mucor (fungus) belongs to the class-Zygomycetes. The members of Zygomycetes bear non-motile non-flagellated gametes. 

3317 Views