51.

Deforestation causes

• soil erosion

• soil pollution

• noise pollution

• air pollution

Abundance of a species in a population, within habitat is called

• niche density

• absolute density

• relative density

• geographic density

Mirabilis jalapa shows

• codominance

• incomplete dominance

• dominance

• complementary genes

In genetic engineering, which of the following is used?

• Plasmid

• Plastid

• Mitochondria

• ER

Which of the following plants are used as green manure in crop fields and in sandy soils?

• Saccharum munja and Lantana camara

• Dichanthium annulatum and Azolla nilotica

• Crotalaria juncea and Alhagi camelorum

• Calotropis procera and Phyllanthus niruri

In a flowering plant, archesporium gives rise to

• wall and tapetum

• only tapetum and sporogenous cells

• only wall of the sporangium

• both wall and sporogenous cells

During translation initiation in prokaryotes, a GTP molecule is needed in

• association of 30S, mRNA with formyl-met-tRNA

• association of 50S subunit of ribosome with initiation complex

• formation of formyl-met-tRNA

• binding of 30S subunit of ribosome with mRNA

In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

• 61

• 60

• 20

• 64

Which one of the following bacteria has found extensive use in genetic engineering work in plants?

• Bacillus coagulens

• Agrobacterium tumefaciens

• Bacillus subtilis

• E. coli

The aleurone layer in maize grain is specially rich in

• starch

• lipids

• protein

• cellulose