11. Cattle quickly swallow grass and store it in which of its body parts?
[A] Rumen
[B] Esophagus
[C] Small intestine
[D] Salivary glands
Show Answer
Correct Answer: A [Rumen]
Notes:
Cattle quickly swallow grass and store it in rumen. The rumen serves as a large fermentation vat in which bacteria and other microorganisms reside. The rumen, also known as a paunch, forms the larger part of the reticulorumen
12. When compared to the mammals, birds are less sensitive to temporary deprivation of water, because? (UPSC Prelims 1990)
[A] The water requirement per unit weight is less in birds than in mammals.
[B] Absorption of water from the gut is more efficient in birds than in mammals.
[C] Urea excretion in mammals entails a greater loss of water than that in birds.
[D] None of these
Show Answer
Correct Answer: A [The water requirement per unit weight is less in birds than in mammals.]
Notes:
When compared to the mammals, birds are less sensitive to temporary deprivation of water, because the water requirement per unit weight is less in birds than in mammals.
13. Which one of the following is useful for biological control of pests? (UPSC Prelims 1991)
[A] Honey bees and locusts
[B] Scorpions and spiders
[C] Wasps and birds
[D] Parrots and kites
Show Answer
Correct Answer: B [Scorpions and spiders]
Notes:
Spiders, mites, scorpions, and several related groups are not insects, but belong to the arthropod class Arachnida. About 15 families of spiders are frequently encountered in crops, where they provide benefit as natural control agents.
14. 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.
15. Which of the following branch of biology deals with management of farms and the science of crop production?
[A] Agrostology
[B] Agaronomy
[C] Agroinformatics
[D] Agronomy
Show Answer
Correct Answer: D [Agronomy]
Notes:
Agronomy is the branch of biology that deals with the management of farms and the science of crop production.
16. Leslie Orgel was known for discovering which of the following?
[A] life was based on RNA
[B] life was based on protien
[C] life was based on DNA
[D] None of these
Show Answer
Correct Answer: A [life was based on RNA]
Notes:
In the late 1960s, Orgel proposed that life was based on RNA before being based on DNA or proteins. His theory included genes based on RNA and RNA enzymes.
17. In what form do fungi store food?
[A] Lipid
[B] Starch
[C] Oil and glycogen
[D] Protein
Show Answer
Correct Answer: C [Oil and glycogen]
Notes:
Oil and glycogen are stored in the fungus. Glycogen is a type of food that animals and fungi store.
18. The lysozyme which destroys the bacterial cell, releasing the mature virus is present where?
[A] immediate early phage genes
[B] late genes
[C] delayed early genes
[D] all of these
Show Answer
Correct Answer: B [late genes]
Notes:
The lysozyme which destroys the bacterial cell, releasing the mature virus is present in late genes.
19. Which of the following is not a cause of Food Poisoning?
[A] Salmonella
[B] Campylobacter
[C] E. coli & Shigella
[D] Yersinia pestis
Show Answer
Correct Answer: D [Yersinia pestis]
Notes:
Plague is a disease that affects humans and other mammals and is caused by the bacterium Yersinia pestis.
20. Which of the following are characteristic of meristematic tissue?
[A] they have very small and few vacuoles
[B] they do not store food
[C] the quality of self-renewal
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Meristematic tissue have very small and few vacuoles, do not store food and the quality of self-renewal.
