21. Which sugar is present in RNA?
[A] Hexose
[B] Ribose
[C] Fructose
[D] Glucose
Glucose
Show Answer
Correct Answer: B [Ribose]
Notes:
Ribose is a simple sugar present in RNA. The chemical formula of ribose is C5H10O5, Hexose (C6H1206), Glucose (C6H12O6).
22. Chromatophores participate in which of the following processes?
[A] Photosynthesis
[B] respiration
[C] Development
[D] Speed
Show Answer
Correct Answer: A [Photosynthesis]
Notes:
Chromatophores are one of the members of phototrophic bacteria. They contain bacteriochlorophyll pigments and carotenoids and participate in photosynthesis.
23. Heteromorphic alternation of generation is commonly found in__?
[A] Algae
[B] Fungi
[C] Bryophyta
[D] All the above
Show Answer
Correct Answer: C [Bryophyta]
Notes:
Heteromorphic alternation of generation is commonly found in Bryophyta. Bryophytes are small, non-vascular plants, examples of mosses, liverworts, and hornworts.
24. What is the stage in which a plant slows down its cellular activity and sheds its leaves?
[A] dormancy
[B] abscission
[C] tropisms
[D] None of these
Show Answer
Correct Answer: A [dormancy]
Notes:
Dormancy is the stage in which a plant slows down its cellular activity and sheds its leaves.
25. Which of the following is an example of a plant with a Fibrous Root System?
[A] Carrot
[B] Onion
[C] Oak Tree
[D] Turnip
Show Answer
Correct Answer: B [Onion]
Notes:
A fibrous root system is characteristic of grasses and other monocotyledons like onions. Unlike in the taproot system of dicotyledonous plants where one major root originates from the stem and smaller roots arise off of this taproot, in a fibrous root system many equally sized roots arise off of the stem. These types of roots cover a larger surface area and are therefore better at absorbing nutrients and water from the soil.
26. Which one of the following is not a downy mildew fungus?
[A] Bremia Lectuca
[B] Uncinula Necator
[C] Sclerospora Graminocola
[D] Plasmopara Viticola
Show Answer
Correct Answer: B [Uncinula Necator]
Notes:
Uncinula necator is a fungus that causes powdery mildew of grape. The fungus is believed to have originated in North America.
27. Which of the following contains notochord in the embryonic stage?
[A] Non-chordates
[B] Vertebrates
[C] All chordates
[D] Some of the chordates
Show Answer
Correct Answer: C [All chordates]
Notes:
All chordates contain notochord in the embryonic stage. This midline serves as the source of the signal. It patterns the surrounding tissue and serves as a major skeletal element of the developing embryo.
28. Consider the following:
- Turtles
- Alligators
- Crocodiles
- Frog
Which of the above are reptiles?
[A] Only 1 and 2
[B] Only 2 and 3
[C] Only 1, 2 and 3
[D] Only 2, 3 and 4
Show Answer
Correct Answer: C [Only 1, 2 and 3]
Notes:
The reptile family includes lizards, turtles, alligators, crocodiles, and snakes. Reptiles have rough scales or bony plates covering the skin. It is shed regularly. They are cold-blooded creatures.
29. Into how many subclasses are reptiles divided?
[A] 2
[B] 3
[C] 4
[D] 5
Show Answer
Correct Answer: B [3]
Notes:
The class Reptilia is divided into three major sub-classes: Anapsida, Parapsida, and Diapsida.
30. What is the appearance of the most advanced character in a crocodile?
[A] Powerful jaws
[B] Shelled eggs
[C] Thecodont dentition
[D] Four chambered heart
Show Answer
Correct Answer: D [Four chambered heart]
Notes:
The four-chambered heart is the most advanced character in a crocodile which makes them different from other reptiles. The four-chambered heart is characteristic of the mammalian class. The presence of this type of heart makes crocodiles similar to mammals.
