The sources of primary inoculum of Colletotrichum falactum include
A. Old fragmented stalks
B. Young leaves
C. Secondary roots
D. Primary flowering buds
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Diseases that affect certain organs of the host or parts of those organs are called
A. Systemic diseases
B. Localised diseases
C. Permanent diseases
D. Temporary diseases
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The relations where at least one of the species is harmed have been grouped under
A. Mutalism
B. Commensalism
C. Antagonism
D. Amensalism
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The soil which are only partly weathered mineral materials in which maturation has not occurred are known as
A. Residual soil
B. Sedimentary soil
C. Skeletal soil
D. Transported soil
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The organism that causes the disease is termed
A. Incitant
B. Parasite
C. Saprophyte
D. None of the above
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Which of the following is a diploid?
A. Egg
B. Synergids
C. Antipodals
D. Secondary nucleus
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Consider the following statements regarding the changes which usually occur in the ovule during the development of seed and choose the correct answer:
1. The zygote develops into a fruit
2. The seeds having copious amounts of endosperm tissue are called exalbuminous
3. The exalbuminous seeds usually store reserve food materials in cotyledons
4. The inner integument, if persists, forms the
A. 1, 2 and 3 are true
B. Only 2 is true
C. Only 3 is true
D. 2, 3 and 4 are true
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Consider the following statements regarding the symptoms of rugose mosaic of potato and choose the correct answer:
1. The disease occurs in a sporadic manner, hence causes less damage to the affected plants
2. It makes its appearance as small chlorotic spots
3. The leaves and branches may become rough and rugose due to the abnormal growth of hair
4. The young leaves usually remain unaffected
A. Only 1 and 4 are true
B. Only 1, 2 and 4 are true
C. Only 2, 3 and 4 are true
D. Only 2 and 3 are true
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Carotenoids that contain oxygen are called
A. Phycobilins
B. Xanthophylls
C. Chlorophyll b
D. Phycoerythrins
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The movement of plant which is caused by the reversible change in the turgidity of cells is known as
A. Nutation
B. Movement of variation
C. Tropic movement
D. Nastic movement
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Which one of the following gases is essential for photosynthesis process?
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The soil which is formed by the weathering of soil forming rocks is called
A. Embryonic soil
B. Transported soil
C. Sedentary soil
D. None of the above
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The term ecology was first proposed by
A. H. Reiter (1885)
B. G. St. Hilaire (1859)
C. E. Haeckel (1869)
D. Hanson and Churchill (1965)
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A bisporic embryo sac was for the first time reported in
A. Allium fistulosum
B. Allium cepa
C. Anogra pallida
D. Jussieua repens
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The statement, optimum temperature for photosynthesis is lower than that for respiration, was proposed by
A. McKinney (1966)
B. Smith (1974)
C. Ballinger (1966)
D. Cottle (1952)
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Witches broom disease is a result of
A. Necrosis
B. Hypoplasia
C. Hypertrophy
D. Damping off
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First step of photosynthesis is
A. activation of chlorophyll by sunlight
B. oxygen comes out from water
C. formation of carbohydrate
D. fixation of carbon dioxide
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Occurrence of cleavage polyembryony is very common in the family
A. Brassicaceae
B. Orchidaceae
C. Euphorbiaceae
D. Apocynaceae
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Which one of the following is not an essential micronutrient for plants?
A. Boron
B. Potassium
C. Sodium
D. Magnesium
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In case of Vanda, fixation of epiphytes to the trunks of trees is done by attaching.
A. Climbing root
B. Clinging root
C. Primary root
D. Rhizome
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