1. Which hormone promotes internode/petiole elongation in deep water rice?
(Topic: Plant Hormones)
(1) Kinetin
(2) Ethylene
(3) 2, 4-D
(4) GA3
Answer: (2)
2.
Movement and accumulation of ions across a membrane against their concentration
gradient can be explained by (Topic: Membrane Transport)
(1)
Facilitated Diffusion
(2) Passive
Transport
(3) Active
Transport
(4) Osmosis
Answer (3)
3.
Large, colourful, fragrant flowers with nectar are seen in (Topic: Pollination)
(1) Bird
pollinated plants
(2) Bat
pollinated plants
(3) Wind
pollinated plants
(4) Insect
pollinated plants
Answer (4)
4. In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as (Topic : Plant growth and development)
(2)
Development
(3)
Senescence
(4)
Differentiation
Answer (1)
5. The
historic Convention on Biological Diversity, ‘The Earth Summit’ was held in Rio
de Janeiro in the year (Learn more: Environmental Conventions)
(1) 1992
(2) 1986
(3) 2002
(4) 1985
Answer (1)
6.
During the purification process for recombinant DNA technology, addition of
chilled ethanol precipitates out (Topic : Biotechnology and its applications)
(1) DNA
(2) Histones
(3)
Polysaccharides
(4) RNA
Answer (1)
7. How many ATP and NADPH2 are required for the synthesis of one molecule of Glucose during Calvin cycle? (Topic: Plant Physiology - Photosynthesis)
(1) 18 ATP and 12 NADPH2
(2) 12 ATP and 16 NADPH2
(3) 18 ATP and 16 NADPH2
(4) 12 ATP and 12 NADPH2
Answer (1)
8. In the equation GPP −R = NPP
GPP is Gross Primary Productivity
NPP is Net Primary Productivity
R here is ________.
(1) Respiratory quotient
(2) Respiratory loss
(3) Reproductive allocation
(4) Photosynthetically active radiation
Answer (2)
9. In gene gun method used to introduce alien DNA into host cells, microparticles of ________ metal are used. (Topic : Biotechnology and its applications)
(1) Zinc
(2) Tungsten or gold
(3) Silver
(4) Copper
Answer (2)
10. The phenomenon of pleiotropism refers to
(1) Presence of two alleles, each of the two genes controlling a single trait
(2) A single gene affecting multiple phenotypic expression
(3) More than two genes affecting a single character
(4) Presence of several alleles of a single gene controlling a single crossover
Answer (2)
11. Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R : (Plant Anatomy: Wood)
Assertion A : Late wood has fewer xylary elements with narrow vessels.
Reason R : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :
(1) Both A and R are true but R is NOT the correct explanation of A
(2) A is true but R is false
(3) A is false but R is true
(4) Both A and R are true and R is the correct explanation of A
Answer (4)
12. Among eukaryotes, replication of DNA takes place in :
(1) S phase
(2) G1 phase
(3) G2 phase
(4) M phase
Answer (1)
13. Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.
(1) Polyadelphous and epipetalous stamens
(2) Monoadelphous and Monothecous anthers
(3) Epiphyllous and Dithecous anthers
(4) Diadelphous and Dithecous anthers
Answer (4)
14. Axile placentation is observed in
(1) China rose, Beans and Lupin
(2) Tomato, Dianthus and Pea
(3) China rose, Petunia and Lemon
(4) Mustard, Cucumber and Primrose
Answer (3)
15. Identify the pair of heterosporous pteridophytes among the following :
(1) Selaginella and Salvinia
(2) Psilotum and Salvinia
(3) Equisetum and Salvinia
(4) Lycopodium and Selaginella
Answer (1)
16. The thickness of ozone in a column of air in the atmosphere is measured in terms of :
(1) Decibels
(2) Decameter
(3) Kilobase
(4) Dobson units
Answer (4)
17. What is the function of tassels in the corn cob?
(1) To trap pollen grains
(2) To disperse pollen grains
(3) To protect seeds
(4) To attract insects
Answer (1)
18. Given below are two statements : One labelled as Assertion A and the other labelled as Reason R:
Assertion A : The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason R : Protonema develops directly from spores produced in capsule.
In the light of the above statements, choose the most appropriate answer from options given below:
(1) Both A and R are correct but R is not the correct explanation of A
(2) A is correct but R is not correct
(3) A is not correct but R is correct
(4) Both A and R are correct and R is correct explanation of A
Answer (4)
19. Given below are two statements :
Statement I : The forces generated transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II : Transpiration cools leaf surfaces sometimes 10 to 15 degree evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below :
(1) Both Statement I and Statement II are incorrect
(2) Statement I is correct but Statement II is incorrect
(3) Statement I is incorrect but Statement II is correct
(4) Both Statement I and Statement II are correct
Answer (4)
20. Spraying of which of the following phytohormone on juvenile conifers helps hastening the maturity period, the leads early seed production? (Learn more: Plant Hormones)
(1) Gibberellic Acid
(2) Zeatin
(3) Abscisic Acid
(4) Indole-3-butyric Acid
Answer (1)
21. Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by
(1) Sutton and Boveri
(2) Alfred Sturtevant
(3) Henking
(4) Thomas Hunt Morgan
Answer (2)
22. Expressed Sequence Tags (ESTs) refers to
(1) All genes that are expressed as proteins.
(2) All genes whether expressed or unexpressed.
(3) Certain important expressed genes.
(4) All genes that are expressed as RNA.
Answer (4)
23. Upon exposure to UV radiation, DNA stained with ethidium bromide will show
(1) Bright blue colour
(2) Bright yellow colour
(3) Bright orange colour
(4) Bright red colour
Answer (3)
24. Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : ATP is used at two steps in glycolysis.
Reason R : First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in
conversion of fructose-6-phosphate into fructose-1-6-diphosphate.
In the light of the above statements, choose the correct answer from the options given below :
(1) Both A and R are true but R is NOT the correct explanation of A.
(2) A is true but R is false.
(3) A is false but R is true.
(4) Both A and R are true and R is the correct explanation of A.
Answer (4)
25. Unequivocal proof that DNA is the genetic material was first proposed by
(1) Alfred Hershey and Martha Chase
(2) Avery, Macleoid and McCarthy
(3) Wilkins and Franklin
(4) Frederick Griffith
Answer (1)