Multiple Choice QuestionsWhich extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Amnion
D.
Amnion
Amnion is an extraembryonic membrane that surrounds embryo in reptiles, birds and mammals. It provides a kind of private aquarium to the embryo and protects it from mechanical shock and desiccation.
Chorion (serosa) is the outermost extra - embryonic membrane in reptiles, birds and mammals. It surrounds the whole embryonic system of the embryo.
Yolk sac contains yolk in reptiles and birds. In mammals, the yolk sac is also known as an umbilical vesicle. It is connected to enter one of the embryo by a slender yolk stalk. Allantois functions as an embryonic urinary bladder or as a respiratory extension of hindgut in reptiles and birds. In mammals, it is modified to carry blood vessels to and from the placenta.
A transgenic food crop, which may help in solving the problem of nightblindness in developing countries is
Flavr savr tomatoes
Starlink maize
Bt soyabean
Golden rice
Which of the following bio-engineered bacteria is utilized for cleaning of marine oil slicks?
Escherichia coli
Pseudomonas syringae
Pseudomonas putida
Rhizoctonia solani
Cells obtained from cancerous tumours are known as
Hybridomas
Myelomas
Lymphocytes
Monoclonal cells
When pollen tube enters through micropyle, the process is called
Porogamy
Chalazogamy
Mesogarny
Apogamy
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