31. Which of these is not a biological agent that causes disease?
[A] Mycoplasma
[B] Virus
[C] Radiations
[D] Fungi
Show Answer
Correct Answer: C [Radiations]
Notes:
Radiations are not a biological agent that causes disease. Its physical agents cause disease along with electricity, pressure, heat, cold, etc.
32. Where are the genes for cytoplasmic male sterility in plants located?
[A] Chloroplast genome
[B] Mitochondrial genome
[C] Cytosome
[D] None of these
Show Answer
Correct Answer: B [Mitochondrial genome]
Notes:
The genes for cytoplasmic male sterility in plants are located in the Mitochondrial genome.
33. Which of the following is a product of biotechnology?
[A] Bacteria
[B] Skin
[C] Vaccine
[D] Plants
Show Answer
Correct Answer: C [Vaccine]
Notes:
The vaccine is a product of biotechnology. Vaccines prepare the immune system to recognize and attack invaders or antigens.
34. Which of the following cell organells are present only in plant cell?
[A] Lysosomes
[B] Plastids
[C] Mitochondria
[D] Cell membrane
Show Answer
Correct Answer: B [Plastids]
Notes:
The plastid is a major double-membrane organelle found in the cells of plants. Plastids are the site of manufacture and storage of important chemical compounds used by the cell. Plastids often contain pigments used in photosynthesis, and the types of pigments present can change or determine the cell’s colour.
35. Which liquid is contained inside the nucleus of a cell?
[A] Nucleosome
[B] Protoplasm
[C] Nucleoplasm
[D] Cytoplasm
Show Answer
Correct Answer: C [Nucleoplasm]
Notes:
The nucleoplasm is the liquid or semi-liquid substance of the nucleus filling the space around the DNA and the nucleoli. It is a type of protoplasm that is made up mostly of water, a mixture of various molecules, and dissolved ions. It is completely enclosed within the nuclear membrane or nuclear envelope.
36. The part of the stem where a leaf arises is known as ___:
[A] Carpel
[B] Bud
[C] Node
[D] Tuber
Show Answer
Correct Answer: C [Node]
Notes:
The leaves arise in the regions of the plant known as the plant nodes and are therefore the point of attachment of the leaves. The region of the plant between two nodes is known as the internode. The angle between the upper surface of the leaf and the stem from which it arises is known as the axil.
37. Which one of the following is known as the immovable property in the cell?
[A] Nucleic acid
[B] Fat
[C] Protein
[D] Carbohydrate
Show Answer
Correct Answer: A [Nucleic acid]
Notes:
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). They are merely transmitted from one generation to next.
38. Riboflavin present in fish is also known in form of ____:
[A] Vitamin K
[B] Vitamin C
[C] Vitamin B2
[D] Vitamin B12
Show Answer
Correct Answer: C [Vitamin B2]
Notes:
Riboflavin is also known as vitamin B2. It is a vitamin found in food and used as a dietary supplement. Food sources include eggs, green vegetables, milk and other dairy product, meat, fish, mushrooms, and almonds. Riboflavin is a water soluble and heat-stable vitamin that the body uses to metabolize fats, protein, and carbohydrates into glucose for energy.
39. The Drone in honey-bee are ____:
[A] Sterile female
[B] Sterile male
[C] Fertile female
[D] Fertile male
Show Answer
Correct Answer: D [Fertile male]
Notes:
Drones are male honey bees. They develop from eggs that have not been fertilized, and they cannot sting, since the worker bee’s stinger is a modified ovipositor (an egg laying organ). Drones die soon after mating with female partner.
40. ____ is the study of fungi:
[A] Geronotology
[B] Chronobiology
[C] Geobiology
[D] Mycology
Show Answer
Correct Answer: D [Mycology]
Notes:
Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy and their use to humans as a source for tinder, medicine, food, and entheogens, as well as their dangers, such as poisoning or infection. From mycology arose the field of phytopathology, the study of plant diseases.