SPSC Lecturer Botany Past Paper 25-06-2013

21- Change in the base sequence of a gene that alters or eliminates a protein is:

A. Mis-sense mutation
B. Sense mutation 
C. Allelic mutation 
D. Target mutation

Answer : A. Mis-sense mutation

22- Plants expressing foreign genes introduced by genetic engineering are:

A. Transgons
B. Hybrids
C. Mutants
D. Transgenics

Answer : D. Transgenics

23- Who discovered nucleus in living cell?

A. Albert
B. Philips V. Leeuwenhoek
C. Robert Brown
D. Robert Hooke

Answer : C. Robert Brown

24- Plants growing on sand are called as:

A. Chaemophytes
B. Oxyophytes
C. Lithophytes
D. Psammophytes

Answer : D. Psammophytes

25- Which of the following are Prokaryotes?

A. Animals and archaea 
B. Plants and animals 
C. Archaea and bacteria
D. Bacteria and fungi

Answer : C. Archaea and bacteria

26- What is the name of the process by which a Eukaryotic cell engulfs very large particles, or even entire foreign cells?

A. Pinocytosis
B. Exocytosis
C. Endocytosis
D. Lymphocytosis

Answer : C. Endocytosis

27- Population density is the:

A. Number of communities per ecosystem 
B. Number of species per community 
C. Number of individuals per species per unit area or volume
D. All of these

Answer : C. Number of individuals per species per unit area or volume

28- Plants that flower only once in their lifetime are called:

A. Erearpic
B. Holocarpic
C. Polycarpic
D. Monocarpic

Answer : D. Monocarpic

29- Which of the following is used to transfer genes to higher transgenic plants:

A. Cosmic
B. Lambda-phage
C. Ti-plasmid
D. All of these

Answer : C. Ti-plasmid

30- Chromosomes reduce to half in Meiotic cell division at:

A. Metaphase I 
B. Anaphase I
C. Telophase II 
D. None of these

Answer : B. Anaphase I

31- In a di-hybrid cross, the ratio in F₂ generation is:

A. 3:2
B. 3:1
C. 9:3:3:1 
D. All of these

Answer : C. 9:3:3:1

32- Organic matter is completely absent in:

A. Cast
B. Mold
C. Impression
D. All of these

Answer : C. Impression

33- Chromosome with arm on one side only is:

A. Acrocentric
B. Telocentric
C. Metacentric
D. Sub-metacentric

Answer : B. Telocentric

34- Seedless vascular plants include:

A. Anthophyta
B. Gnetophyta
C. Cycadophyta
D. Lycophyta

Answer : D. Lycophyta

35- Which of the following is correct:

A. 2n produces n
B. 2n produces 2n 
C. n produces n 
D. n produces nothing

Answer : A. 2n produces n

36- Glycolysis means splitting of:

A. Sucrose
B. Sugar
C. Glucose
D. Maltose

Answer : C. Glucose

37- All the following facts about camels make them adapt to long periods of drought in hot deserts, except:

A. Camels do not sweat until the external temperature rises to about 41°C, which is much higher than for most mammals
B. Camels can survive a loss of up to 40 percent of their body water, for most mammals this limit is 20 percent
C. The camel’s thick fur insulates its body against high temperatures thereby reducing water loss
D. Camels can drink as much as 1/3 of their body weight in 10 minutes, which other mammals cannot

Answer : D. Camels can drink as much as 1/3 of their body weight in 10 minutes, which other mammals cannot

38- Soil erosion is greater when:

A. No rains occur
B. No winds occur 
C. The rainfall is received in heavy downpour
D. rainfall is evenly distributed 

Answer : C. The rainfall is received in heavy downpour

39- The theory of mutation was propounded by:

A. Mendel
B. Hugo de Vries
C. Darwin
D. Lamarck

Answer : B. Hugo de Vries

40- Universal blood donor belongs to the blood group:

A. A
B. B
C. AB
D. O

Answer : D. O

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