1. Lac is the scarlet resinous secretion from ________?
[A] Herbs
[B] Trees
[C] Bark
[D] insects
Show Answer
Correct Answer: D [insects]
Notes:
Lac is the scarlet resinous secretion from insects. It is secreted by a number of a number of species of lac insects, of which the most commonly cultivated is Kerria lacca. The farmer gets a stick that contains eggs ready to hatch and ties it to the tree to be infested.
2. The foramen of Monro is associated with _?
[A] Central nervous system
[B] Digestive system
[C] Respiratory system
[D] Excretory system
Show Answer
Correct Answer: A [ Central nervous system]
Notes:
The interventricular foramen is also known as foramen of Monro. It is a part of the ventricular system and the connection between the third ventricle and the lateral ventricles.
3. Which among the following animals is closest to corals in evolutionary terms?
- Sea Cow
- Sea Horse
- Sea Lion
- Sea Anemone
Select the correct answer using the codes given below:
[A] Only 1
[B] Only 2
[C] Only 3
[D] Only 4
Show Answer
Correct Answer: D [Only 4]
Notes:
Corals and sea anemones both belong to Phylum Cnidaria, sharing similar evolutionary lineages as simple, radially symmetrical, aquatic invertebrates. Sea cow (mammal), sea horse (fish), and sea lion (mammal) are distantly related and do not share this close evolutionary relationship with corals. Hence, option 4 is correct.
4. ‘Ophiology’ is the study of which of the following animals?
[A] Moths and Butterflies
[B] Snakes
[C] Whales
[D] Ants
Show Answer
Correct Answer: B [Snakes]
Notes:
Ophiology is the branch of Biology that study Snakes. Thus Option [B] is correct. While the study of Moths and Butterflies is called as Lepidoteriology, The study of whale is called as Cetology and the study of Ants is called as Myrmecology.
5. Which of the following Vitamin is responsible for anti-sterile activities?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin E
[D] Vitamin D
Show Answer
Correct Answer: C [Vitamin E]
Notes:Vitamin E is known as anti-sterility vitamin or fertility vitamin. It is chemically called as tocopherol. Vitamin E deficiency occurs rarely in adults. Much like vitamin C, vitamin E is another powerful anti-oxidant. Vitamin E is used during testosterone synthesis. Sperm production or spermatogenesis requires vitamin E as well as zinc. Following symptoms have been associated with vitamin E deficiency in humans:
- Muscular weakness & dystrophy, nocturnal muscle cramps
- Neurological disorders
- Degeneration of liver (hepatic necrosis)
- Shortened life-span of RBCs
6. At which of the following stages the sex of the offspring is determined?
[A] The conception takes place
[B] The sperm fertilises the ovum
[C] The embryo is partially developed
[D] The end of gestation period is near
Show Answer
Correct Answer: A [The conception takes place]
Notes:
Biological sex is determined by a pair of sex chromosomes: XY in males and XX in females. Genes on the X chromosome are said to be X-linked. X-linked genes have distinctive inheritance patterns because they are present in different numbers in females (XX) and males (XY).Thus usually occurs as soon as conception takes place.
7. Which among the following is the name given to the ductless and secretory glands in the human body?
[A] Endocrine glands
[B] Exocrine glands
[C] Salivary glands
[D] None of the above
Show Answer
Correct Answer: A [Endocrine glands]
Notes:
Ductless glands which are also known as internally secreting glands or endocrine glands secrete their products or hormones directly into the blood stream in response to instructions from the brain.
8. Which of the following contain a protein named Alpha-keratin?
[A] Blood
[B] skin
[C] wool
[D] eggs
Show Answer
Correct Answer: B [skin]
Notes:
Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hair, horns, mammalian claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.
9. Which one of the following organisms can serve as a biofertiliser for rice crop?
[A] Blue-green algae
[B] Rhizobium sp
[C] Mycorrhizal fungi
[D] Azotobacter sp
Show Answer
Correct Answer: A [Blue-green algae]
Notes:
Blue green algae is used as a biofertilizer in rice crop. Blue green algae has the nitrogen fixing ability which enhances the production of rice. Blue–green algae are not algae at all, but types of bacteria called cyanobacteria that are normally present in many lakes.
10. Which among the following is an optimum temperature for wheat seed germination?
[A] 11-15 deg celsius
[B] 15-25 deg celsius
[C] 10-12 deg celsius
[D] 20-22 deg celsius
Show Answer
Correct Answer: C [10-12 deg celsius]
Notes:
10-12 deg celsius is the optimum temperature for wheat germination. 25-30 deg celsius is the optimum temperature for crop growth.
