mcq biology

Botany HSST Recruitment: Kerala PSC Question Paper with Answer Key and Explanations: Part 2 (Q 25 – 50)


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Kerala PSC HSST Botany 2012 Examination
Higher Secondary School Teacher: Junior & Senior
Question Paper Code 40/2012 (Cat. NO. 449/2010)

Original question paper of Kerala PSC HSST Botany Junior / Senior (Higher Secondary School Teacher Botany), Category No. 449/2010) examination conducted by Kerala PSC (Public Service Commission) on 13/04/2002 (Q. Code 40/2012) for the appointment of HSST Botany in Government Higher Secondary Schools of Kerala under the Directorate of Higher Secondary Education, Trivandrum, Govt. of Kerala. Questions are in MCQ (Multiple Choice Questions) format.

Part – 2 (Questions 26 – 50)

26.  Auxospores are produced by:

a.       Volvox
b.      Spirogyra
c.       Diatoms
d.      Oedogonium

Ans. (c). Diatoms

Auxospore is a type of asexual spore in diatoms. Auxopore formation helps the diatomic cells to regain its original cell size which is reduced by repeated mitotic cell divisions. 

27.  Lectins are:

a.       Lipids
b.      Protein binding carbohydrate
c.       Fatty acids
d.      Carbohydrates binding proteins

Ans. (d). Carbohydrates binding proteins

Lectins: they are plant proteins which specifically bind to carbohydrates. They are toxins since they can coagulate glycoproteins. Lectins have immense application in biological research; they can be used for the separation and purification of specific glycoproteins.  In the earlier days, lectins were also used for blood typing. Concanavalin A (ConA) is the first isolated and commercialized plant lectin (isolated from jack bean Canavalia ensiformis). Ricin is another common plant lectin isolated from Ricinus communis (castror).

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