Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 55850
TLS Online TPP Program

#Question id: 13206

Given below are some of the statements that regulate the sucrose loading mechanism;
A) The solute potential or, more likely, the turgor pressure of the sieve elements
B) Sucrose concentration in the apoplast
C) The available number of symporter protein molecules
Possible observation given on how to avoid regulation;
i) increase in sieve element turgor above a certain threshold would lead to a compensatory increase in loading
ii) High sucrose concentrations in the apoplast would increase phloem loading
iii) SUT1 transporter mRNA and protein have been lower after 15 hours of darkness than after a light treatment. These data suggest that the concentration of SUT1 transporter molecules could regulate loading
iv) Decrease in sieve element turgor below a certain threshold would lead to a compensatory increase in loading
v) The transporter mRNA and protein high in darkness than lower in the light treatment
Which of the following combinations represents correct observation?

#Unit 6. System Physiology – Plant
  1. A-i, B-ii, C-v    
  2. A-iv, B-ii, C-iii
  3. A-iv, B-ii, C-v
  4. A-iii, B-ii, C-iv
More Questions
TLS Online TPP Program

#Question id: 7296

#Unit 5. Developmental Biology

some of the following statements regarding to this experiment are given below. Which of the following statements is incorrect?
TLS Online TPP Program

#Question id: 7300

#Unit 5. Developmental Biology

Following genes regulate flowering, column I represents genes, column II represents transcription factor family and column III represents functions.

Column I

Column II

Column III

A. FLOWERING D (FD)

i. bZIP

a. Activates flowering

downstream of florigen

B. SUPPRESSOR OF

OVEREXPRESSION OF

CONSTANS1 (SOC1)

ii. MADS

b. Receptor for florigen

C. FLOWERING LOCUS C

 

c. Class E homeotic genes

D. SEPALLATA (SEP)

 

d. Floral repressor

 Which of the following is correct?
TLS Online TPP Program

#Question id: 22944

#Unit 5. Developmental Biology

In the floral meristem, the FT-FD complex activates the expression of
TLS Online TPP Program

#Question id: 22938

#Unit 5. Developmental Biology

Genes that regulate flowering, have different transcription factors and functions:
 
 Gene Transcription Factor Family Functions
 1. CONSTANS (CO) i- bHLH P- Activates flowering in response to long photoperiods 
 2. FLOWERING D (FD) ii- Zinc finger Q- Receptor for florigen, activates flowering via AP1

 3. PHYTOCHROME INTERACTING

 FACTOR4 (PIF4)

 iii- bZIP R- Activates florigen in response to high temperature
 4. FLOWERING LOCUS C iv- MADS S- Floral repressor
Choose correct match:
TLS Online TPP Program

#Question id: 7314

#Unit 5. Developmental Biology

With reference to plant flowering pattern; match the terms of Column I with the most appropriate term of Column II. (Se-Sepal; Ca-Carpel; St-stamen; Pe-Petal)

s.no.

Homeotic mutants

(Column 1)

S. No

Flower patterning

(Column 2)

A.     

Apetala2 mutant

                    I.  

Ca-Ca-Ca-Ca

B.      

Agamous /Apetala3 mutant

                    II.    

Se-Pe-Pe-Se

C.      

Agamous mutant

               III. 

Se-Se-Se-Se

D.     

Apetala2/Apetala3 mutant

                IV.

Ca-St-St-Ca

 
TLS Online TPP Program

#Question id: 7312

#Unit 5. Developmental Biology

Following statements regarding to the classes of genes that regulate floral development:

A.  Floral organ identity genes directly control floral identity. The proteins encoded by these genes are transcription factors that likely control the expression of other genes whose products are involved in the formation and/or function of floral organs.

B.  Cadastral genes act as spatial regulators of the floral organ identity genes by setting boundaries for their expression.

C.   Meristem identity genes are necessary for the initial induction of the organ identity genes. These genes are the positive regulators of floral organ identity.

D.  Cadastral genes act as negative regulators of the floral organ identity genes by inhibits their expression.

E.   Meristem identity genes are the negative regulators of floral organ identity genes.

Which of the above statements are true?