#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 ;
#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?
#Question id: 10524
#Unit 6. System Physiology – Plant
Members of the Poaceae family, which includes all of the cereal crops, use benzoxazinoids, these alkaloids shows;
a) Alkaloids are derived from the tryptophan as constitutively produced defensive secondary metabolites
b) These benzoxazinoids such as DIBOA and its derivative DIMBOA are usually stored in the peroxisome
c) Upon damage, the inactive glycosides are hydrolyzed, generating glucosinolate, which are toxic not only to insect herbivores but also against pathogens
d) DIBOA and DIMBOA perform insecticidal and pesticidal activities
e) It can be inactivated by hydroxylation and N-glycosylation reactions
Which of the following combination is correct about benzoxazinoids alkaloids?
#Question id: 10525
#Unit 6. System Physiology – Plant
The major cyanogenic glycoside in_____i______ is _____ii______.
a) i-sorghum, ii-Amygdalin
b) i-sorghum, ii-dhurrin
c) i-Cassava, ii-lotaustralin
d) i-Cassava, ii-linamarin
Which one is incorrect combination of cyanogenic glycoside?
#Question id: 10526
#Unit 6. System Physiology – Plant
What is elicitors? Which one is not belongs to the elicitor responses
#Question id: 10527
#Unit 6. System Physiology – Plant
Based on their feeding behaviors, three major types of insect herbivores can be distinguished, which evades the constitutive defense;
| COLUMN A | COLUMN B |
| A) Phloem feeders | i) caterpillars, grasshoppers, and beetles |
| B) Cell-content feeders | ii) aphids and whiteflies |
| C) Chewing insects | iii) mites and thrips |
Correctly match the feeding behaviour with its insects;