During oogenesis in mammals, polar bodies are formed. Which statement best describes the function of polar bodies?
To provide nutrients to the developing oocyte.
To allow for the reduction of chromosome number while retaining most of the cytoplasm in the oocyte.
To initiate the process of fertilization.
To guide the sperm towards the oocyte.
Related Questions
I. Plasmatic growth
II. Differentiation
III. Maturation
IV. Senescence
Identify the correct sequence of the following events occurring in plants and choose the correct option accordingly
I → II → III → IV
I → II → IV → III
IV → III → II → I
IV → I → II → III
S-shaped or sigmoid growth curve have
I. lag phase
II. log phase
III. stationary phase
IV. diminishing growth phase
Select the correct option
All except IV
All except III
All except II
I, II, III and IV
The cells proximal (just next away from the tip) to the meristematic zone represents the phase of
Division
Maturation
Elongation
Meristematic division
Heterophylly can be observed in
I. cotton
II. coriander
III. larkspur
Select the right option
I, II and III
I and II
II and III
I and III
Plants follow …A… pathways in response to environment or phases of life to form different kind of structures. This ability is called …B… Complete the given statement with the correct combination of options
A-same; B-elasticity
A-elasticity; B-same
A-different; B-plasticity
A-same; B-plasticity
Which one is the example of dedifferentiation?
Procambium and vascular cambium
Cork cambium and interfasicular cambium
Cork cambium and vascular cambium
Procambium and cork cambium
Development includes (plants)
I. Differentiation
II. Redifferentiation
III. Dedifferentiation
Select the right combination from the given option
I and II
II and III
III and I
I, II and III
Which of the following statements are correct?
I. A multicellular organism is composed of mainly three types of cells
II. Undifferentiated cells are stem cells and are unspecialised cells, which usually possesses the power of division
III. Differentiated cells are post-mitotic cells and are specialised to perform specific functions
IV. Dedifferentiated cells are differentiated cells which revert to undifferentiated state to take over the function of division
I, II and III
II, III and IV
I and IV
All of the above
Differentiation in plants is open because
Cells/tissue arising out of meristem regain the capacity of division under certain conditions
Cells/tissue arising out of different meristem have different structures at maturity
Cells/tissue arising out of different meristem have same structures at maturity
All of the above
I. Increased vacuolation
II. Cell enlargement
III. New cell wall deposition
Which of the above are the characteristics of phase of elongation?
Choose the correct option accordingly
I and II
II and III
I and III
I, II and III
