11. Which bacteria do not have a cell wall and are therefore resistant to penicillin?
[A] Cyanobacteria
[B] Mycoplasmas
[C] Bdellovibrios
[D] Spirochetes
Show Answer
Correct Answer: B [Mycoplasmas]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
12. Where does agar-agar come from?
[A] Gigartina
[B] Gelidium
[C] Gracillaria
[D] All the above
Show Answer
Correct Answer: D [All the above]
Notes:
Agar-agar is a jelly-like substance. It is a non-nitrogenous carbohydrate. It consists of two polysaccharides namely agarose and agaropectin. It is obtained from many red algae. For example, Gracilaria, Gelidium, Gigartinia.
13. Which of the following occurs in Bryophytes?
[A] Great economic value
[B] No value at all
[C] Great ecological importance
[D] A lot of aesthetic value
Show Answer
Correct Answer: C [Great ecological importance]
Notes:
They are called pollution indicators. These prevent soil erosion by running water.
14. Fruitless flowering plants are called__?
[A] Sterile plants
[B] Angiosperms
[C] Primitive
[D] Gymnosperms
Show Answer
Correct Answer: D [Gymnosperms]
Notes:
Fruitless flowering plants are called Gymnosperms. They do not produce flowers. Seeds are not formed inside a fruit.
15. What does it act as a connecting link between angiosperms and gymnosperms?
[A] Gnetales
[B] Coniferales
[C] Ginkgoales
[D] Cycadales
Show Answer
Correct Answer: A [Gnetales]
Notes:
Gnetales act as a connecting link between angiosperms and gymnosperms. They show resemblance to both gymnosperms and angiosperms.
16. What is the arrangement of ovules inside the ovary called?
[A] Aestivation
[B] Placentation
[C]
Hibernation
[D] Fragmentation
Show Answer
Correct Answer: B [Placentation]
Notes:
The arrangements of ovules within the ovary are known as placentation.
17. What does apomixis mean?
[A] Fruit with seed
[B] Fruit without seed
[C] Fruit without fertilization
[D] Seed without fertilization
Show Answer
Correct Answer: D [Seed without fertilization]
Notes:
Apomixis means Seed without fertilization. Apomictic parthenogenesis in which an egg cell develops directly into an embryo without prior fertilization.
18. Which characters are not typical to class Mammalia?
[A] Alveolar lungs
[B] Seven cervical vertebrae
[C] Thecodont dentition
[D] Ten pairs of cranial nerves
Show Answer
Correct Answer: D [Ten pairs of cranial nerves]
Notes:
Alveolar lungs, Seven cervical vertebrae, and Thecodont dentition are characters of class Mammalia whereas Anamniotes have 10 pairs of cranial nerves.
19. The fish living in stagnant water is __
[A] Lepidosiren
[B] Protopterus
[C] Neoceratodus
[D] None of these
Show Answer
Correct Answer: C [Neoceratodus]
Notes:
The fish living in water is Neoceratodus. Neoceratodus is a genus of lungfish in the family Neoceratodontidae. Neoceratodus found in Australia.
20. Which of the following is commonly known as the narrow-mouthed frog?
[A] Ranidae
[B] Hylidae
[C] Myrohylidae
[D] Bufonidae
Show Answer
Correct Answer: C [Myrohylidae]
Notes:
Mycrohylidae is commonly known as narrow-mouthed frogs. It is a geographically widespread family of frogs.
