11. 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.
12. Which blood group among the following is known as universal donor?
[A] A
[B] B
[C] O
[D] AB
Show Answer
Correct Answer: C [O]
Notes:
Type O negative blood group is considered as the universal blood type. People with type O blood group are called universal donors because type O negative blood is compatible to any blood recipient’s type.
13. Turmeric is obtained from which part of the plant?
[A] Fruit
[B] Stem
[C] Root
[D] Flower
Show Answer
Correct Answer: B [Stem]
Notes:
Turmeric is the rhizome or underground stem of a ginger-like plant. It is usually available under ground, as a bright yellow, fine powder.
14. Through which of the following mechanisms genes control the activity of living organisms?
[A] Photosynthesis
[B] Protein synthesis
[C] Vitamins
[D] Hormones
Show Answer
Correct Answer: B [Protein synthesis]
Notes:
The genes control the characteristic by making a specific protein. Genes are the segment of DNA that contains information to form RNA which ultimately forms protein. Each gene contains two alleles and this instructs the cell to make protein for expression of traits.
If the plant has gene for green seeds then it will make protein which will give green colour to seeds.
15. Who is known as the ‘God of plants’?
[A] Soma
[B] Varuna
[C] Rudra
[D] Indra
Show Answer
Correct Answer: A [Soma]
Notes:
Soma is also known as the God of plants or the king of gods or the special god of the Brahmanas. All the hymns of the eleventh mandal are assigned to him. Aryans considered Himalaya as the source of the soma plant.
16. Which among the following is not a bio-fertilizer?
[A] Vermi compost
[B] Urea
[C] Azobacter
[D] Clostridium
Show Answer
Correct Answer: B [Urea]
Notes:
Biofertilizers are substances that contain microorganisms, which when added to the soil increase its fertility and promote plant growth. Urea is not a biofertilizer.
17. Study of the chemical nature of cells and tissues is known as__?
[A] Biochemistry
[B] Conchology
[C] Histochemistry
[D] Dermatology
Show Answer
Correct Answer: C [Histochemistry]
Notes:
Histochemistry combines the techniques of biochemistry and histology in the study of the chemical constitution of cells and tissues.
18. Which of the following is true for chromatin?
[A] These are highly condensed DNA
[B] It is found in the nucleus
[C] It contains a single dsDNA
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Chromatin is a complex of DNA and proteins that make up chromosomes within the nucleus of eukaryotic cells.
19. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins
Show Answer
Correct Answer: A [Deterioration of Fat]
Notes:
The process of oxidation of oily and Fatty food, which changes its taste and smell is known as Rancidity. Rancidity generally occurs in Fat.
20. Which of the following virus has its envelope from the host cell nucleus?
[A] Paramyxoviruses
[B] Retroviruses
[C] Orthomyxoviruses
[D] Herpesviruses
Show Answer
Correct Answer: D [Herpesviruses]
Notes:
The Herpesviridae are a large family of DNA viruses. It causes infections and some diseases in animals, including humans. Herpes viruses are divided into three groups: α herpesviruses, herpes simplex virus types 1 and 2.
