Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Amnion
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
Which of the following is a total root parasite?
Cuscuta
Rafflesia
Santalum
Monotrapa
B.
Rafflesia
Rafflesia is a total root parasite, which remains attached to the roots of the host plants and derives all of its nutrition from them. Cuscuta (dodder or amarbel) is a total stem parasite, while Santalum album (sandalwood) is a partial root parasite.
When pollen tube enters through micropyle, the process is called
Porogamy
Chalazogamy
Mesogarny
Apogamy