Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Black (stem) rust of wheat is caused by

  • Alternaria solani

  • Ustilago nuda

  • Puccinia graminis

  • Puccinia graminis


C.

Puccinia graminis

Black (stem) rust of Wheat is caused by Puccinia graminis tritici, a fungus belonging to Sub-class-Teliomycetidae, Order-Uredinales. It is a heteroecious species which completes its life cycle on two plants, ie, barberry (Berberis) plant and wheat (Triticum aestivum).

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12.

Transport of food material in higher plants takes place through

  • companion cells

  • transfusion tissue

  • tracheids

  • tracheids


D.

tracheids

Sieve elements are the food conducting cells of phloem tissue. Sieve element in angiosperms are sieve tubes, while in gymnosperms and pteridophytes, these are sieve cells. 

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13.

Crocodile and penguin are similar to whale and dogfish in which one of the following features?

  • possess a solid single -stranded central nervous system

  • lay eggs and guard them till they hatch

  • possess a bony skeleton

  • possess a bony skeleton


D.

possess a bony skeleton

Crocodile, penguin, whale and dogfish, all are chordates. So, all of these have gill slits at some stage of development.

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14.

ABO blood grouping is controlled by gene I, which has three alleles and show codominance, There are six genotypes. How  many phenotypes in all are possible.?

  • Six

  • Three

  • Four

  • Four


C.

Four

In ABO blood group system, inheritance of grouping is controlled by a single autosomal gene on chromosome-9 with three major alleles A, B and O) (IA, IB and Io). The ABO blood group system has at least 6 genotypes. On the basis of presence or absence of antigens and antibodies, 4 blood groups (phenotypes) have been differentiated, ie, A, B, AB and O blood groups.

400 Views

15.

Three of the following statements about enzymes are correct and one is wrong. which one is wrong?

  • Enymes require optimum pH for maximal activity

  • Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80o-90o C

  • Enzymes are highly specific

  • Enzymes are highly specific


D.

Enzymes are highly specific

Enzymes show pH sensitivity and require an optimum pH for maximal acitivity.
Enzymes are thermolabile (heat sensitive) and denatured at high temperatures. However, extremophiles (thermophilic bacteria) are exceptions. Most of the enzymes are highly specific in their action. Most enzymes are proteins but exceptionally some are RNA enzymes, eg, ribozymes.

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16.

An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called

  • thylakoid

  • endoplasmic reticulum

  • plasmalemma

  • plasmalemma


D.

plasmalemma

The cytoplasm of all eukaryotic cells is crisscrossed by a network of protein fibres that support the shape of the cell and anchor organelles to fixed locations. This network is called cytoskeleton. It consists of three types of cytoskeletal filaments namely act filaments or microfilaments (formed of globular protein actin), microtubules (formed of tubulin protein) and intermediate filaments (formed of a variety of proteins like vimentin, keratin, desmin, peripherin, lamin etc).

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17.

Root development is promoted by

  • abscisic acid

  • auxin

  • gibberellin

  • gibberellin


B.

auxin

The higher concentration of auxin causes inhibition of root elongation, but the number of lateral branches in the root is considerably increased. In plant tissue cultures, relatively amounts of auxin and cytokinin induce the development of root, shoot or undifferentiated mass of tissues. High auxin to cytokinin ratio favours the root development high cytokinin to auxin ratio favours shoot development, while intermediate concentration results in the formation of undifferentiated cell mass. 

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18.

Which one o0f the following is monoecious?

  • Marchantia

  • Cycas

  • Pinus

  • Pinus


C.

Pinus

Pinus is a monoecious gymnospermic plant, ie, both male and female cones occur on the same plant. 

Marchantia (bryophyte), Cycas (gymnosperm) and date palm (angiosperm) all are dioecious plants, ie, male and female plants are separate.

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19.

Kranz anatomy is one of the characteristics of the leaves of 

  • potato

  • wheat

  • sugarcane

  • sugarcane


C.

sugarcane

Sugarcane is a C4-plan. C4-plants are characterised by the presence of Kranz-type of anatomy. In this, the leaf mesophyll is undifferentiated and its cells (having a normal type of granola chloroplasts) occur in concentric layers around vascular bundles, later is surrounded by large-sized bundle sheath cells (having large -sized agranal chloroplasts) which are arranged in a wreath like manner.

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20.

Jaundice is a disorder of 

  • excretory system

  • skin and eyes

  • digestive system

  • digestive system


C.

digestive system

Jaundice is a disorder of digestive system caused due to blockage or inflammation of the bile duct or hyperbilirubinemia. It is mainly characterised by yellow colouration of skin, white portion of eye and urine

542 Views