TNPSC Scientific Assistant Botany 2010 Paper

Tamil Nadu Public Service Commission Scientific Assistant Botany 2010 Paper

All the filamentous forms of cyanophyceae produce enlarged, transparent, specialized cells in addition to the vegetative cells. They are known as
(a) Trichomes
(b) Heterocysts
(c) Nodules
(d) Blasts

Sequioadendron giganteum is known as
(a) Father of the forest
(b) Tiny shrub
(c) Cryptogam
(d) None of these

Consider the following statements
Assertion (A) – Heterocyst formation increases under conditions of low light intensities.
Reason (R) – The increase in the amount of phosphate in the medium leads to increase in heterocyst production
Now select your answer according to the coding scheme given below –
(a) Both (A) and (R) are true and (R) is the correct explanation of (A)
(b) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(c) (A) is true, but (R) is false
(d) (A) is false, but (R) is true.

Consider the following statements
Assertion (A) – In pinus only the dwarf roots become mycorrhizal.
Reason (R) – Seeds of pinus are polycotyledonous
Now select your answer according to the coding scheme given below
(a) Both (A) and (R) are true and (R) is the correct explanation of (A)
(b) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(c) (A) is true, but (R) is false
(d) (A) is false, but (R) is true.

‘Red rust’ of tea is caused by
(a) Puccinia gramints
(b) Cephaleuros virescens
(c) Colletotrichum falcatum
(d) Fustartum udum

Diatornaceous earth is produced by
(a) Chlorophyceae
(b) Xanthophyceae
(c) Myxophyceae
(d) Bacillariophyceae

A lichen commonly known as rock flower which has been used in curry preparation, is
(a) Rocella
(b) Lobaria
(c) Parmelia
(d) Cladonia

Which plant is known as Peat moss?
(a) Funaria
(b) Polytrichum
(c) Sphagnum
(d) Pogonatum

Which one is known as s traw mushroom?
(a) Agaricus bisporus
(b) Pleurotus sajorcaju
(c) Volvariella volvacea
(d) Psalliota compestris

Bentham and Hooker’s system of classification is based on
(a) Eichler’s system
(b) de Candolle’s system
(c) Bessey’s system
(d) None of these