11. Why honey bees are called social insects? (UPSC Prelims 1982)
[A] They visit all flowers to collect nectar
[B] They live in large family groups
[C] They depend for their food upon other insects
[D] They move socially with other insects
Show Answer
Correct Answer: B [They live in large family groups]
Notes:
Social insects are highly evolved insects that engage in a variety of complex tasks not practiced by the multitude of solitary insects. Honey bees are social insects because they live together in large, well-organized family groups. A single honeybee cannot grow or survive by itself. The three distinct kinds of honeybees in a colony are queen, worker, and drone.
12. In Mycorrhiza, symbiotic association occurs between which of the following organisms? (UPSC Prelims 1990)
[A] Bacteria and roots of higher plants
[B] Algae and roofs of orchids
[C] Fungi and roots of higher plants
[D] Protozoa and roots of higher plants
Show Answer
Correct Answer: C [Fungi and roots of higher plants]
Notes:
Mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant’s rhizosphere, its root system.
13. How many bones are present in healthy adult human being?
[A] 205
[B] 207
[C] 206
[D] 208
Show Answer
Correct Answer: C [206]
Notes:
An adult human skeleton comprises of 206 bones which is greater than the number of bones present at birth. This is due to the fusing of bones as one grows up. The bone density in the human body reaches maximum at the age of 21.
14. What is the scientific name of sea fan?
[A] Psittaciformes
[B] Pavo cristatus
[C] Alcyonacea
[D] Corvus
Show Answer
Correct Answer: C [Alcyonacea]
Notes:
The scientific name of sea fan is Alcyonacea. Alcyonacea are an order of corals that do not produce calcium carbonate skeltons. They are found throughout the oceans of the world.
15. Which of the following is the subject matter of genetics?
[A] Forms and features of plant parts
[B] Heredity and variations
[C] the disorder of living beings
[D] None of these
Show Answer
Correct Answer: B [Heredity and variations]
Notes:
Genetics is the study of heredity in general and genes in particular. Genetics is one of the central pillars of biology and overlaps with many other fields such as agriculture, medicine and biotechnology.
16. The study of cell biology is related to which of the following?
[A] the cell is the fundamental unit of life
[B] cell structure and function
[C] Both 1 & 2
[D] None of these
Show Answer
Correct Answer: C [Both 1 & 2 ]
Notes:
Cell biology is the study of cell structure and function. It revolves around the concept that the cell is the fundamental unit of life.
17. The cytoplasmic membrane of which of the following organisms contains sterols?
[A] Clostridum
[B] Proteus
[C] Mycoplasma
[D] Bacillius
Show Answer
Correct Answer: C [Mycoplasma]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
18. Where are sexual reproduction and mobile cells absent?
[A] Chlorophyceae
[B] Rhodophyceae
[C] Myxophyceae
[D] Phaeophyceae
Show Answer
Correct Answer: C [Myxophyceae]
Notes:
Since being prokaryotic cells, they do not have chromosomes, so they lack sexual reproduction.
19. The energy gained during aerobic respiration is how many times more than that of anaerobic respiration?
[A] 8
[B] 12
[C] 19
[D] 32
Show Answer
Correct Answer: C [19]
Notes:
The energy gained during aerobic respiration is 19 times more than that of anaerobic respiration because In aerobic respiration 38 ATP per glucose is produced but in anaerobic respiration, only 2 ATP per glucose is produced.
20. In anaerobic respiration, glucose is broken down into what?
[A] ethyl alcohol
[B] carbon dioxide
[C] energy
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Glucose breaks down into ethyl alcohol, carbon dioxide, and energy.
Glucose → Alcohol + Carbon dioxide + Energy
