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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Human Reproduction of Biology.
151
Meroblastic cleavage is a division which is
[1]
Spiral
[2]
Total
[3]
horizontal
[4]
Partial/ parietal
Answer: Partial/ parietal
152
After ovulation Graffian follicle regresses into
[1]
Corpus luteum
[2]
Corpus albicans
[3]
Corpus callosum
[4]
Corpus artesia
153
Sertoli cells are regulated by the pituitary hormone known as
[1]
LH
[2]
GH
[3]
FSH
[4]
Prolactin
154
The middle piece of the sperm contains
[1]
Proteins
[2]
Nucleus
[3]
Mitochondria
[4]
Centriole
155
Budding method of asexual reproduction occurs in
[1]
Amoeba
[2]
Plasmodium
[3]
Paramecium
[4]
Hydra
156
In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was
[1]
High levels of FSH and LH in uterus to stimulate endometrial thickening
[2]
High level of circulating HCG to stimulate estrogen and progesterone synthesis
[3]
High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
[4]
High level of circulating HCG to stimulate endometrial thickening
Answer: High level of circulating HCG to stimulate estrogen and progesterone synthesis
157
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
[1]
Retention of well-developed corpus luteum
[2]
Fertilisation of the ovum
[3]
Maintenance of the hypertrophical endometrial lining
[4]
Maintenance of high concentration of sex-hormones in the blood stream
Answer: Maintenance of high concentration of sex-hormones in the blood stream
158
Which of the following groups of cells in the male gonad, represent haploid cells?
[1]
Primary spermatocytes
[2]
Spermatogonial cells
[3]
Germinal epithelial cells
[4]
Secondary spermatocytes
Answer: Secondary spermatocytes
159
Which one of the following statements about human sperm is correct?
[1]
Acrosome serves no particular function
[2]
Acrosome has a conical pointed structure used for piercing and penetrating the egg resulting in fertilization
[3]
The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
[4]
Acrosome serves as a sensory structure leading the sperm towards the ovum
Answer: The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
160
The process of sperm production takes place in the ______.
[1]
Epididymis
[2]
Vas deferens
[3]
Prostate glands
[4]
Seminiferous tubules
Answer: Seminiferous tubules
161
Cryptorchidism is a condition of tests
[1]
Unale to produce sperms
[2]
Having been surgically removed
[3]
Unable to descend in scrotal sacs
[4]
Having remained undeveloped
Answer: Unable to descend in scrotal sacs
162
Corona radia is made up of
[1]
zona pellucid around the oocyte
[2]
vitelline membrane
[3]
follicular cells around the oocyte
[4]
stratum functionalis
Answer: follicular cells around the oocyte
163
Signals for parturition originate from
[1]
Placenta only
[2]
Fully developed foetus only
[3]
Both placenta as well as fully developed foetus
[4]
Oxytocin released from maternal pituitary
Answer: Both placenta as well as fully developed foetus
164
Which of the following structures are derivatives of the endoderm?
[1]
Skin and nerve cord
[2]
Alimentary canal and respiratory structures
[3]
Muscles and blood
[4]
Excretory and reproductive structures
Answer: Alimentary canal and respiratory structures
165
Acrosome is derived from
[1]
Nucleus
[2]
Golgi apparatus
[3]
Mitochondria
[4]
Cytoplasm
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