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#Question id: 12341


The figure shows population growth trajectories over time (as indicated by the arrows) of two stored-grain beetle  species  when  grown  together  under  constant  conditions.  Three  experiments  were  performed  that  differed only in the initial densities of the two species. Which of the following is the best interpretation of the experimental results?


#Unit 10. Ecological Principles
  1. Population growth is random (unpredictable) for each species. 
  2. No equilibrium exists in which both species can coexist.
  3. Interspecific competition is stronger than intraspecific competition.
  4. Density dependence within each species is stronger than interspecific competition.
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#Question id: 10518

#Unit 6. System Physiology – Plant

HC-toxin from the fungus Cochliobolus carbonum, which causes northern leaf blight disease, and inhibits

TLS Online TPP Program

#Question id: 10519

#Unit 6. System Physiology – Plant

Which of the following toxins derived from the fungus Cochliobolus carbonum inhibits specific histone deacetylases in maize?

TLS Online TPP Program

#Question id: 10520

#Unit 6. System Physiology – Plant

Which one of the following fungus causes infected rice shoots to grow much faster relative to uninfected plants and responsible for the “foolish seedling disease” of rice?

TLS Online TPP Program

#Question id: 10521

#Unit 6. System Physiology – Plant

Which is an example of a plant-derived DAMP found in tomato that is produced in response to wounding associated with herbivore activity?

TLS Online TPP Program

#Question id: 10522

#Unit 6. System Physiology – Plant

Mechanical barriers provide a first line of defence against insect pests and pathogens, these mechanical barriers developed by plants;

                   COLUMN A  

                     COLUMN B

A. Thorns

i) It can be found on the stem and petioles of roses and are formed by the epidermis

B. Spines

ii) Found on a lemon tree (Citrus sp.) are modified branches, as can be seen by their position in the axil of a leaf

C. Prickles

iii) Found on shoot and leaves of tomato (Solanum lycopersicum) are derived from epidermal cells

D. Trichomes

iv) which are characteristic of cacti (Opuntia spp.) in the New World, are modified leaves

Match correctly following combination of barrier developed by plants ;

TLS Online TPP Program

#Question id: 10523

#Unit 6. System Physiology – Plant

Conifer resin ducts, which are found in the cortex and phloem, contain a mixture of diverse terpenoids, which are released immediately upon damage by herbivores such as;

a) monocyclic terpenes like- limonene and terpinolene

b) bicyclic monoterpenes- α-pinene and β-pinene

c) tricyclic sesquiterpenes- longifolene, caryophyllene, and δ-cadinene

d) tetracyclic terpenes- longifolene, tetra-terpinolene terpenoids are incorrect?