1. Which among the following plant hormone plays most important role in establishing dormancy in seeds?
[A] Ethylene
[B] Gibberellic acid
[C] Abscisic Acid
[D] Auxin
Show Answer
Correct Answer: C [Abscisic Acid]
Notes:
Abscisic Acid plays the most important role in establishing dormancy in seeds. Abscisic Acid has also been found to be present in metazoans, from sponges up to mammals including humans.
2. Amino acids join together to make polypeptides. What polypeptides make by joining together?
[A] Carbohydrates
[B] proteins
[C] vitamins
[D] All the above
Show Answer
Correct Answer: B [proteins]
Notes:
Proteins are made up of chains of amino acids bound by bonds called peptide bond. There are some 22 different known amino acids which can compose proteins. There may be many more unknown to us.
3. The edible part of ‘cabbage’ is which of the following?
[A] Inflorescence
[B] Bud
[C] fruit
[D] none of the above
Show Answer
Correct Answer: B [Bud]
Notes:
The edible part of ‘cabbage’ is the vegetative bud. Vegetative buds are the buds from which vegetative parts like stems and leaves arise, rather than flowers.
4. Which among the following enzyme plays an important role in adding the building blocks to the primer in a sequence determined by the DNA template?
[A] Helicase
[B] Primase
[C] Polymerase
[D] Diastase
Show Answer
Correct Answer: C [Polymerase]
Notes:
Polymerase enzyme plays an important role in adding the building blocks to the primer in a sequence determined by the DNA template. It synthesizes long chains of polymers or nucleic acids.
5. The Indian Pipe Plant or Monotrapa can be best placed in which among the following groups?
[A] Parasite
[B] Saprophyte
[C] Insectivorous
[D] Lithophyte
Show Answer
Correct Answer: B [Saprophyte]
Notes:
Pipe Plant is a total saprophyte i.e. thrives on dead or decayed organic matter
6. Which one of the following creatures has maximum number of ribs?
[A] Ray fish
[B] Flying mammal
[C] Snake
[D] Crocodile
Show Answer
Correct Answer: C [ Snake ]
Notes:
Snakes have the maximum number of ribs. On an average they have 200 to 400 bones (Vertibrae ) and each have a pair of ribs on either side.
7. Which of the following is responsible for giving colour to human skin?
[A] Haemoglobin
[B] Melanin
[C] Luciferin
[D] Flavonoids
Show Answer
Correct Answer: B [Melanin]
Notes:
Melanin is a pigment that gives human skin, hair, and eyes their color. Dark-skinned people have more melanin in their skin than light-skinned people have. Melanin is produced by cells called melanocytes.
8. Nereis, Pheretima (Earthworm) and Hirudinaria (blood sucking leech) are examples of which Phylum?
[A] Aschelminthes
[B] Coelenterata
[C] Arthropoda
[D] Annelida
Show Answer
Correct Answer: D [Annelida]
Notes:
The annelids (Annelida, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.
9. Stripes can be seen over the body of many animals. Which of the following indication is given by the stripes?
[A] Mating habit
[B] Food habit
[C] Cave dwelling
[D] Matching of skin colour with surroundings
Show Answer
Correct Answer: D [Matching of skin colour with surroundings]
Notes:
Some animals have stripes on their back because of the Camouflage Effect. Camouflage effect refers to combination of different colours or materials in order to make animals or objects hard to see or to disguise oneself in the surrounding. Striped Animals can easily hunt other animals by disguising themselves in the surrounding and making it hard for other animals to see.
10. In which of the following diseases Sex chromosomes transmit?
[A] Myopia
[B] Colour blindness
[C] Longsightedness
[D] Night blindness
Show Answer
Correct Answer: B [Colour blindness]
Notes:
It is sex-linked that genetic red-green color blindness affects males much more often than females, because the genes for the red and green color receptors are located on the X chromosome, of which males have only one and females have two.
