Ten percent law of energy transfer in a food chain is given by

• Schimper

• Elton

• Haeckel

• Lindemann

A polygenic inheritance in human beings is

• Skin colour

• Sickle cell anaemia

• Colour blindness

• Phenylketonuria

73.

Nucleic acid segment tagged with a radiactive molecule is called

• Clone

• Probe

• Plasmid

• Vector

Powdery mildew of wheat is caused by a species of

• Puccinia

• Erysphe

• Ustilago

• Albugo

Double fertilization occurs in

• Riccia

• Pteridium

• Cycas

• Capsella

Biological Oxygen Demand (BOD) is a measure of

• Industrial wastes poured into water bodies

• The extent to which water is polluted with an organic compound

• Amount of carbon monoxide inseparably combined with haemoglobin

• Amount of oxygen needed by green plants during the night 

The Montreal Protocol refers to

• Persistent organic pollutants

• Global warming and climate change

• Substances that deplete the ozone layer

• Biosafety of genetically modified organisms

The Okazaki fragments in DNA chain growth

• Results in transcription

• Polymerise in the 3' to 5' direction and forms replication fork

• Prove semi-conservative nature of DNA replication

• Polymerise in the 5' to 3' direction and explain 3' to 5 DNA replication

One gene-one enzyme relationship was established for the first time in

• Neurospora crassa

• Salmonella typhimurium

• Escherichia coli

• Diplococcus pneumoniae

In gymnosperms, the pollen chamber represents

• A cell in the pollen grain in which the sperms are formed

• A cavity in the ovule in which pollen grains are stored after pollination

• An opening in the megagametophyte through which the pollen tube approaches the egg

• The microsporangium in which pollen grains develop