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NEET Biology Solved Question Paper 2012

Multiple Choice Questions

61.

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

Chorion
Allantois
Yolk sac
Amnion

62.

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

63.

Polyploidy can be induced by the application of

Auxin
Kinetin
Colchicine
Ethylene

64.

Which of the following bio-engineered bacteria is utilized for cleaning of marine oil slicks?

Escherichia coli
Pseudomonas syringae
Pseudomonas putida
Rhizoctonia solani

65.

Cells obtained from cancerous tumours are known as

Hybridomas
Myelomas
Lymphocytes
Monoclonal cells

66.

Which of the following is a total root parasite?

Cuscuta
Rafflesia
Santalum
Monotrapa

67.

When pollen tube enters through micropyle, the process is called

Porogamy
Chalazogamy
Mesogarny
Apogamy

68.
Outer wall of pollen grain is made up of

Cellulose

Sporopollenin

Pectocellulose

Lignin

Sporopollenin

A pollen grain contains two-layered cell wall, the outer exine and inner intine. Sporopollenin is found in the exine of pollen grains, which is the most resistant biological material known, of microbial and chemical decomposition. Due to this, pollen grains are well preserved during fossilization. Intine of pollen grain is made up of pectocellulose.