A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

• 60

• 240

• 120

• 480

Agar-Agar is produced by

• Fungi

• Alage

• Bacteria

• Blue-green algae

Endosperm of gymnosperms is

• Haploid

• Tetraploid

• Diploid

• None of these

Pebrine is a disease of

• Fish

• Honey Bee

• Silk Worm

• lac insect

If the Bengal tiger become extinct

• Hyenas and wolves will become scarce

• Its gene pool will be lost forever

• The wild areas will be safe for man and domestic

• The population of beautiful animals like deer will get stabilised

Factor govering the earth surface is

• Topographic

• Edaphic

• Temperature

• Biotic

Biological treatment of water pollution is done with the help of

• Fungi

• Lichen

• Phytoplanktons

• None of the above

In DNA, when AGCT occurs, their association is as per which of the following pair

• A-G, C-T

• A-T, G-C

• A-C, G-T, A-C, E-T

• All of these

Bacterial endotoxin is

• A toxic protein that stays inside the bacterial cell

• A toxic protein that is excreted into the medium

• Lipopolysaccharide located on the surface of the bacteria

• None of the above

The direction of energy flow is

•  Producers → Herbivores → Decomposers → Omnivores

• Producers → Carnivore → Herbivores → Decomposes

• Decomposers → Carnivores → Herbivores → Producers

• Producers → Herbivores → Carnivores → Decomposers