#Question id: 5651
#XL - R Botany
Growth and development of plant parts involves ________.
I) cell division to produce new cells
II) enlargement and elongation of cells
III) specialization of cells into tissues
#Question id: 5685
#XL - R Botany
Human sperm are allowed to fertilize ova having non- functional ovastacin. The following possibilities may be of significance in the fusion of these gametes:
A. The sperms will not fertilize ova.
B. The sperms will bind and penetrate the zona pellucida but will not be able to fuse with ovum membrane.
C. ZP2 will not be clipped by cortical granule protease.
D. CD9 protein of egg membrane microvilli will not be able to interact sperm membrane proteins in the absence of ovastacin.
E. Polyspermy may occur frequently.
Which combination of statements represent the outcome of the above event?
#Question id: 5686
#XL - R Botany
Following statements are regarding to double fertilization in angiosperms.
A. One sperm cell fuses with the egg cell to produce the zygote that will develop into the new embryonic plant.
B. The second sperm cell fuses with the usually binucleate central cell, giving rise to the
endosperm, the tissue that nourishes the developing embryo. This second event is not “true” fertilization in the sense of male and female gametes undergoing fusion.
C. The second sperm cell fuses with the usually binucleate central cell, giving rise to the
endosperm, the tissue that nourishes the developing embryo. This second event is “true” fertilization in the sense of male and female gametes undergoing fusion.
D. During fertilization in angiosperm, when the sperm cells are released, the egg undergoes a flux of Ca2+. Then, chemicals released from the egg appear to make the sperm competent for cell fusion.
Which of the following statements are true?
#Question id: 5687
#XL - T Zoology
The error in meiosis that produces a 47,XYY karyotype is best described by
#Question id: 5688
#XL - R Botany
Which of the following are not cause of aneuploidy
#Question id: 5688
#XL - T Zoology
Which of the following are not cause of aneuploidy