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Practice MCQ Questions and answers on Biology-GK

Learn and practice General Knowledge questions and answers on Biology with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-7 section-3

Each section contains 100 MCQs on Biology .
61
Which of the following bacterium causes crown gall disease in plants?
Discuss
Answer & Solution
Answer: Option B
Solution:
Crown gall is caused by the bacterial plant pathogen, Agrobacterium tumefaciens. Crown gall bacteria enter plant roots through wounds.
62
Fossils of blue green algae were found in lime stones with the age almost as old as
Discuss
Answer & Solution
Answer: Option B
Solution:
Fossils of blue green algae were found in lime stones with the age almost as old as 2.3 Billion years.
63
They have also proved extremely useful in our quest of knowledge of outer space.
Discuss
Answer & Solution
Answer: Option C
Solution:
Yeasts have also proved extremely useful in our quest of knowledge of outer space.
64
Chemicals like ________ may be added to different foods or fruits to prevent or retard the growth microorganisms.
Discuss
Answer & Solution
Answer: Option C
Solution:
Chemicals like potassium metabisulphite may be added to different foods or fruits to prevent or retard the growth microorganisms.
65
Eutrophication is the result of
Discuss
Answer & Solution
Answer: Option B
Solution:
Eutrophication is the result of algae and aquatic plants.
66
Mycology is the branch of botany in which we study about
Discuss
Answer & Solution
Answer: Option B
Solution:
Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy and their use to humans as a source for tinder, traditional medicine, food, and entheogens, as well as their dangers, such as toxicity or infection.
67
Mycology is the branch of botany in which we study about
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
68
Phycology is the branch of botany in which we study about
Discuss
Answer & Solution
Answer: Option A
Solution:
Phycology is the branch of botany in which we study about algae.
69
The DNA bacterium consists of ring-like pieces known as the
Discuss
Answer & Solution
Answer: Option A
Solution:
The DNA bacterium consists of ring-like pieces known as the plasmids.
70
It is commonly found in the bottom tidal pools?
Discuss
Answer & Solution
Answer: Option B
Solution:
Ulva is commonly found in the bottom tidal pools.