TLS Online TPP Program

#Question id: 10809


Sieve element sap is rich in sugars and other organic molecules, These molecules represent an energy investment for the plant. How their loss be prevented when sieve elements are damaged?

#Unit 6. System Physiology – Plant
  1. Short-term sealing mechanisms not involve sap proteins
  2. long-term mechanism for preventing sap loss entails closing sieve plate pores with callose   
  3. For preventing sap loss using smooth endoplasmic reticulum (SER) which covers the sieve areas  
  4. long-term mechanism for preventing sap loss opening of the sieve tube in angiosperm
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TLS Online TPP Program

#Question id: 11831

#Unit 6. System Physiology – Plant

A volatile compound is a strong competitive inhibitor of ethylene binding______

TLS Online TPP Program

#Question id: 11832

#Unit 6. System Physiology – Plant

Ethylene production and action can be inhibited by various types of inhibitors, some statements about  the inhibitor is given below, which one of the following is incorrect?

TLS Online TPP Program

#Question id: 11833

#Unit 6. System Physiology – Plant

Analysis of mRNA from tomato fruits from wild-type and transgenic tomato plants genetically engineered to lack ethylene has revealed that gene expression during ripening is regulated by at least two independent pathways;

I) Ethylene-dependent pathway

II) Ethylene-independent pathway

Some given genes involved in these two pathways,

a) ACC oxidase

b) respiratory metabolism

c) ACC synthase

d) chlorophyllase

e) lycopene and aroma biosynthesis

Which of the following is the correct combination from the given pathways and its included genes?

TLS Online TPP Program

#Question id: 11834

#Unit 6. System Physiology – Plant

Hook formation and maintenance result from ethylene-induced asymmetric growth,  indicating that phytochrome is the photoreceptor involved in this process

a) Red light induces hook folding, and far-red light reverses the effect of red

b) close interaction between phytochrome and ethylene controls hook opening

c) Red light inhibits ethylene formation, promoting growth on the inner side, thereby causing the hook to open

Which of the following combination from the given statements is correct?

TLS Online TPP Program

#Question id: 11835

#Unit 6. System Physiology – Plant

What is the role of ETO1 (ethylene overproducing 1) in ethylene signalling pathway?

TLS Online TPP Program

#Question id: 11836

#Unit 6. System Physiology – Plant

During the ethylene signalling, absence of ethylene  EIN2 phosphorylates at the C-terminus, and preventing cleavage, these phosphorylation done by