Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Yeast is not included in protozoans but in fungi because

  • it has chlorophyll

  • it shows saprotrophic mode of nutrition

  • it has eukaryotic organisation

  • cell wall is made up of cellulose and reserve food material as starch


B.

it shows saprotrophic mode of nutrition

Saprotrophic mode of nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of dead or decayed organic matter. The palnts which exhibit saprotrophic mode of nutrition are known as saprotrophs. Saprotroph organism is an organism which gets its energy from dead and decaying organic matter. 


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12.

As secondary growth proceeds, in a dicot stem, the thickness of

  • sapwood increases

  • heartwood increases

  • both sapwood and heartwood increases

  • both sapwood and heartwood remains the same


13.

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

  • there is effective pumping of CO2 into bundle sheath cells

  • RuBisCO in C4 plants has higher affinity for CO2

  • six carbon acids are the primary initial CO2 fixation products

  • the primary fixation of CO2 is mediated via PEP carboxylase.


14.

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

  • a proton gradient forms across the inner mitochondrial membrane

  • there is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP).

  • high energy bonds are formed in mitochondrial proteins

  • ADP is pumped out of the matrix into the intermembrane space


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15.

A plasmolysed cell can be deplasmolysed by placing it in

  • isotonic solution

  • saturated solution

  • pure water or hypotonic solution

  • hypertonic solution


16.

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

  • They are absent in animal cells

  • They act as channel proteins

  • They are absent in plant cells

  • They are only externally located


17.

Which of the following is a group of micronutrients for plants?

  • Fe, Mn, Cu, Mo, Zn

  • Fe, Mn, Cu, O, C

  • Cu, B, Cl, Fe, Ca

  • Ca, Mg, Fe


18.

Identify the labelled part in the given figure and select the correct option.

  • A - Heterocyst, B - Mucilaginous sheath

  • A - Mucilaginous sheath, B - Heterocyst

  • A - Heterocyst, B - Capsid

  • A - Pseudopodia, B - Mucilaginous sheath


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19.

Assertion : Gap junctions perform cementing function to keep the neighbouring cells together.

Reason : Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false

  • If both assertion and reason are false


20.

Assertion : Consciousness is considered as the defining property of living organisms.

Reason : All organisms, from the prokaryotes to the most complex eukaryotes can sense and respond to environmental stimuli.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


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