11. Which one of the following statements is not correct? (UPSC Prelims 2002)
[A] All echinoderms are viviparous
[B] Round worm has no circulatory system
[C] In bony fishes, swim bladder is usually present
[D] In cartilaginous fishes, fertilisation is internal
Show Answer
Correct Answer: A [All echinoderms are viviparous]
Notes:
Echinoderm is the common name given to any member of the phylum Echinodermata of marine animals. The adults are recognizable by their radial symmetry, and include such well-known animals as starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or “stone lilies”.
The sexes are separate except few echinoderm species. There is no sexual dimorphism. Fertilization is external and few forms are viviparous.
12. What is the pH range of blood?
[A] 6.55-6.85
[B] 1.55-3.55
[C] 10.5-12
[D] 7.35-7.45
Show Answer
Correct Answer: D [7.35-7.45]
Notes:
Blood has a pH range of 7.35-7.45 which indicates that blood is slightly basic/alkaline. pH scale from 0 to 7 indicates acidic nature, 7 to 14 indicates basic nature of the solution.
13. Which among the following types of bees does not have commercial importance?
[A] Dammer bee
[B] The little bee
[C] The Indian hive bee
[D] None of the above
Show Answer
Correct Answer: D [None of the above]
Notes:
There are around 20,000 different species of bees in the world but only 7 of them are honeybees. Of them only five of them have commercial importance in India, they are as follows:
1. The rock bee
2. The Indian hive bee
3. The little bee
4. The European bee
5. Dammer bee
14. Which of the following branch of biology deals with the study of behavioral aspects of animals?
[A] Myrmecology
[B] Palaeozoology
[C] Psychobiology
[D] Parazoology
Show Answer
Correct Answer: C [Psychobiology]
Notes:
Psychobiology is branch of biology which deals with the study of behavioral aspects of animals.
15. Mammology is the branch of science related to the study of?
[A] mammals
[B] breasts
[C] mollusks
[D] none of these
Show Answer
Correct Answer: A [mammals]
Notes:
Mammology is a branch of biology that deals with the study of mammals.
16. Which of the following is required by viruses for growth?
[A] bacteria
[B] plants
[C] animals
[D] living cells
Show Answer
Correct Answer: D [living cells]
Notes:
Virus, infectious agent of small size and simple structure that can multiply only in living cells of animals, plants or bacteria.
17. What are the inclusion bodies of the measles virus?
[A] intracytoplasmic
[B] intranuclear
[C] both (a) and (b)
[D] none of these
Show Answer
Correct Answer: C [both (a) and (b)]
Notes:
The inclusion bodies of the measles virus are intracytoplasmic and intranuclear.
18. Which of the following materials are acted upon by putrefying bacteria?
[A] Fat
[B] Protein
[C] Carbohydrate
[D] Vitamins
Show Answer
Correct Answer: B [Protein]
Notes:
The primary energy source for putrefying bacteria, also known as decay bacteria, is Protein. While they can break down diverse types of biological material, they primarily act on proteins due to their constituent amino acids, which provide an ideal nutrient source. Their interaction with proteins results in decay and decomposition, a critical part of the biogeochemical cycle in nature.
19. In Bryophyta, the adult plant body is__?
[A] Sporophyte
[B] Epiphyte
[C] Sporophyll
[D] Gametophyte
Show Answer
Correct Answer: D [Gametophyte]
Notes:
A gametophyte is one of two alternative multicellular stages in the life cycle of plants and algae.
20. In ferns, the leaves during young conditions are called__?
[A] Scale leaf
[B] Sporophyll
[C] Circinate Ptyxis
[D] None of these
Show Answer
Correct Answer: C [Circinate Ptyxis ]
Notes:
In ferns, the leaves during young conditions are called Circinate Ptyxis.
