11. Guinea pigs used in medical research belong to which of the following categories?
[A] Rodents
[B] Black swine
[C] Stocky and brown in colour
[D] Found in Asia only
Show Answer
Correct Answer: A [Rodents]
Notes:
The guinea pig or domestic guinea pig also known as cavy or domestic cavy, is a species of rodent belonging to the family Caviidae and the genus Cavia.
12. Which one of the following is a membrane that protects the developing embryo from desiccation?
[A] Amnion
[B] Allantois
[C] Chorion
[D] Yolk sac
Show Answer
Correct Answer: A [Amnion]
Notes:
The amnion or amniotic sac protects everyone embryo from desiccation, it contains amniotic fluid which cushions the embryo from shocks.
13. Which of the following defines an Antigen?
[A] destroys harmful bacteria
[B] is used to treat poisoning
[C] lowers body-temperature
[D] stimulates formation of antibody
Show Answer
Correct Answer: D [stimulates formation of antibody]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
14. Which one of the following statements is not correct?
[A] Milk contains none of the B-vitamins
[B] Vitamin-A (retinal) deficiency leads to dry and scaly skin
[C] One of the symptoms of scurvy is pain in the joints
[D] Vitamin B1 (thiamine) deficiency can lead to heart failure
Show Answer
Correct Answer: A [Milk contains none of the B-vitamins]
Notes:
Milk contains the water soluble vitamins thiamin (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), vitamin B6 (pyridoxine), vitamin B12 (cobalamin), vitamin C, and folate. Milk is a good source of thiamin, riboflavin and vitamin B12.
15. Seed germination takes place in which of the following layers of soil profile?
[A] Organic layer
[B] Surface/A layer
[C] B layer
[D] C layer
Show Answer
Correct Answer: B [Surface/A layer]
Notes:
Surface layer/ A layer which is rich in humus content is responsible for seed germination. Living organisms which aids the production (such as earthworms) also are present in this layer.
16. Splanchnology is a branch of biology dealing with __?
[A] Study of visceral organs
[B] Study of species
[C] Study of bony joints and ligaments
[D] Study of forget including buccal cavity and stomach
Show Answer
Correct Answer: A [Study of visceral organs]
Notes:
Splanchnology is the study of the visceral organs, i.e. digestive, urinary, reproductive and respiratory systems.
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. Which of the following comprise plant decomposers?
[A] Monera and fungi
[B] Plantae and fungi
[C] Monera and Animalia
[D] Animalia and Protista
Show Answer
Correct Answer: A [Monera and fungi]
Notes:
Decomposers are a type of bacteria and fungi that break down dead and decaying organic matter into simpler things like carbon dioxide, water, simple sugars and mineral salts, and return nutrients to the soil.
19. In which of the following β-oxidation mainly occurs?
[A] Mitochondria
[B] Cytoplasm
[C] Nucleus
[D] Chloroplast
Show Answer
Correct Answer: A [Mitochondria
]
Notes:
β-oxidation in mammals occurs in both mitochondria and peroxisomes, whereas plants and most fungi switch off β-oxidation.
20. Which bacteria are used in production of biogas/gobar gas plants?
[A] Methanogens
[B] Ethanogens
[C] Propanogens
[D] N-butane
Show Answer
Correct Answer: A [Methanogens]
Notes:
Methanogens belong to the Euryarchaeota of the Archaebacteria. They convert inorganic organic compounds into methane and carbon dioxide.
