Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 9391
TLS Online TPP Program

#Question id: 12609

Which of the following is an example of an ecosystem?

#Unit 10. Ecological Principles
  1. All of the brook trout in a 500 hectare2 river drainage system.
  2. The plants, animals, and decomposers that inhabit an alpine meadow. 
  3. A pond and all of the plant and animal species that live in it.
  4. Interactions between all of the organisms and their physical environment in a tropical rain forest.
More Questions
TLS Online TPP Program

#Question id: 11609

#Unit 6. System Physiology – Plant

All of gibberellins are tetracyclic diterpenoid acids, but only a few of which, have intrinsic biologically active gibberellins these are__
TLS Online TPP Program

#Question id: 11610

#Unit 6. System Physiology – Plant

Environmental factors such as photoperiod and temperature can alter the levels of active gibberellins by affecting gene transcription for specific steps in the biosynthetic pathway such as;

a) Promotion of germination by light has been shown to be due to increases in GA1 levels resulting from a light-induced increase in the transcription of the gene for GA3ox, which converts GA20 to GA1

b) level of GA20-oxidase occurs in the highest amount in shoot tips and elongating stems, is increased under long-day conditions.  The fact that GA 20-oxidase is the enzyme that converts GA53 to GA20

c) Giving cold treatment  of Thlaspiarvense and a return to high temperatures, the ent-kaurenoic acid is converted to GA9, the most active gibberellin for stimulating the flowering response

d) Potato plants overexpressing the GA20ox gene showed tuberization, whereas transformation with the antisense gene for GA20ox inhibited tuberization

Which of the following from the given above statements is correct?
TLS Online TPP Program

#Question id: 11611

#Unit 6. System Physiology – Plant

Given below are names of phytohormones in column I and their associated features/effects/ functions in column II.

                     

                    Column I

             ( Phytohormones)

                

                        Column II

                       ( Features)

 

A) Auxin

 

i)  Causes seed germinations

 

B) Cytokinin

 

ii)  Plant Stress Hormone that activates many defense responses

 

C) ABA

 

iii) Polar transport

 

D) Gibberellin

 

iv)  Delayed leaf senescence

 

E) Jasmonic acid

 

v) Causes seed dormancy

 

 







Which of the following combination from the above statements is  correct? 
TLS Online TPP Program

#Question id: 11612

#Unit 6. System Physiology – Plant

AMO-1618, which blocks GA biosynthesis at the cyclization step, what would be the A, B and C represents. where, the control shows no inhibitor;
TLS Online TPP Program

#Question id: 11613

#Unit 6. System Physiology – Plant

Gibberellin can induce auxin biosynthesis and that auxin can induce gibberellin biosynthesis. If the pea plants are decapitated, leading to  a cessation in stem elongation, which one of the following prediction about this experiment is correct?
TLS Online TPP Program

#Question id: 11614

#Unit 6. System Physiology – Plant

During the biosynthesis of GA many stages will be involved in this pathway, one of which is takes place in the plastids is GGPP is converted into the ent-kaurene via  two steps of pathway involving enzymes known as