Practice MCQ Questions and answers on Biology-GK

Algae and fungi are collectively known as thallophytes.

All of these is true about bryophytes.

Some posterior thoracic vertebrae, the lumbar, sacral and a few anterior caudal vertebrae are fused to form a complex bone called synsacrum. The innominate bones are fused with the synsacrum to a greater or lesser extent, according to species, forming an avian pelvis.

Bacteria play a central role in the making of dairy products such as butter, cheese, yogurt etc.

Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” compounds, such as ammonia, that are usable by plants. Read about nitrogen fixation.

Bacillus dentificans is the bacterium which reduces the fertility of soil.

Bacteria are used in the retting of flax and hemp.

The preparation of curd requires a lactobacillus bacteria, while yogurt is made using two specific strains of bacteria called Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus bacteria. Other strains of lactic acid bacteria may also be added.

Baker's yeast is the common name for the strains of yeast commonly used in baking bread and bakery products, serving as a leavening agent which causes the bread to rise (expand and become lighter and softer) by converting the fermentable sugars present in the dough into carbon dioxide and ethanol. It is a fungus.

Most nitrogen fixation occurs naturally, in the soil, by bacteria.