Biology - Online Test
Q1. Lysine rich Maize variety is
Answer : Option C
Explaination / Solution:
Lysine is a type of amino acids present in the proteins. Maize variety Shakti is rich in lysine amino acids.
Q2. Cleanliness observed by human beings will adversely affect the habitats of:
Answer : Option D
Explaination / Solution:
Scavenger feeds on dead animal and plant material present in the habitat. Cleanliness observed by human beings will adversely affect the habitat of the scavengers.
Q3. Which among the following is a gregarious pest?
Answer : Option C
Explaination / Solution:
Locust (Locusta) is a gregarious pest belonging to phylum Arthropoda.
Q4. Division of human egg is
Answer : Option C
Explaination / Solution:
Meroblastic is the type of incomplete cleavage that occurs in very yolky eggs, in which the egg cytoplasm but not the yolk divides.
Q5. Apophysis of moss is
Answer : Option A
Explaination / Solution:
The sporophyte of moss is differentiated into three parts – foot, seta and capsule. The capsule in turn is differentiated into 3 regions a) apophysis- the sterile basal portion of capsule, it is in continuity with seta b) theca or body of capsule, which is the fertile region, and c) operculum the apical region of capsule .
Apophysis is rich in chloroplast and thus photosynthetic region of moss , it also provides nutrition to the developing sporangium .
Q6. DNA and RNA resemble each other in possessing
Answer : Option B
Explaination / Solution:
Both DNA and RNA consists of polymers of nucleotides. RNA is single stranded but DNA is double stranded. DNA polynucleotide contains thymine but RNA polynucleotide contains uracil.
Q7. Henking in 1891 observed a specific nuclear structure in 50% of sperms. He named this structure as
Answer : Option D
Explaination / Solution:
The specific nuclear structure in few insects and 50 percent of the sperm observed by Henking was named as X body. Although its role in sex determination was not known to his time.
Q8. Which of the following microbes cannot be grown into nutritive media?
Answer : Option B
Explaination / Solution:
Virus cannot be grown into nutritive medium because it lacks all cellular apparatus required for reproduction. It reproduces using cellular apparatus of host cell.
Q9. Primary constituents of photochemical smog are
Answer : Option A
Explaination / Solution:
Photochemical smog is a mixture of air pollutants which have been chemically altered into further noxious compounds by exposure to sunlight. The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate).The smog causes poor visibility on roads and airports.
Q10. When and where anaerobic respiration does occurs in man and yeast?
Answer : Option C
Explaination / Solution:
Anaerobic respiration in man occurs in muscle cells during sudden activity in cells to form lactic acid. In yeast anaerobic respiration occurs in absence of oxygen to form ethanol.
