The wheat plants with infected ears, which emerge out of the boot leaves earlier than the healthy ones, may be uprooted at once and burnt. Tnis practice is called

Which hormone is found in the gaseous form?

A. Abscisic acid

B. Ethylene

C. Gibberellins

D. Auxins

In the Tetrameles - Stereospermum - Cedrela formation which of the following associations is recognised?

A. Cinnamomum - Amoora association

B. Bischofia - Dillenia association

C. Shorea - Lagerstroemia association

D. Mesua - Michelia association

Which of the following react with haemoglobin, forming methemoglobin which will not take up oxygen?

A. Nitrates

B. Nitrites

C. Carbides

D. Oxides

Internally, hydathode shows a group of loosely arranged parenchymatous cells called as

A. Epiderm

B. Epithelium

C. Ampithecium

D. Epithem