Biology MCQ Practice Set - General Science P2

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251211. Pasteurization is related to?

A

Sterilization of milk

B

Dehydration of milk

C

Fermentation of milk

D

Distillation of milk

A

Correct Answer: A. Sterilization of milk
Explanation: Pasteurization or pasteurization is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to less than 100 °C (212 °F), to eliminate pathogens and extend shelf life. The process is intended to destroy or deactivate organisms and enzymes that contribute to spoilage or risk of disease, including vegetative bacteria, but not bacterial spores.
Sterilization refers to any process that removes, kills, or deactivates all forms of life (in particular referring to microorganisms such as fungi, bacteria, spores, unicellular eukaryotic organisms such as Plasmodium, etc.) and other biological agents like prions present in a specific surface, object or fluid, for example, food or biological culture media. Sterilization can be achieved through various means, including heat, chemicals, irradiation, high pressure, and filtration.

133912. Parkinson's disease is characterized by the loss of nerve cells in the

A

Reticular formation

B

Cerebral cortex

C

Cingulate cortex

D

Substantia nigra

D

Correct Answer: D. Substantia nigra
Explanation: Parkinson's disease is caused by a loss of nerve cells in the part of the brain called the substantia nigra.

145413. Dengue is caused by Flavivirus. What is the vector of dengue fever?

A

Aedes Mosquito

B

Female Anopheles mosquito

C

Male Anopheles mosquito

D

Culex mosquito

A

Correct Answer: A. Aedes Mosquito
Explanation: Female mosquito only bite.
Dengue, yellow fever is caused by Aedes mosquito.
Malaria is caused by Anopheles mosquito.
Filariasis is caused by Culex mosquito.

132314. The intermediate host of Leishmania donovani is

A

Dragonfly

B

Anopheles mosquito

C

Sandfly

D

Tsetse fly

C

Correct Answer: C. Sandfly
Explanation: Sandfly causes Leishmaniasis which is known as Kala-Azar

128915. Which one of the following is a polymorphic species?

A

Gorilla

B

Ant

C

Garden Lizard

D

Spider

B

Correct Answer: B. Ant
Explanation:

In biology, polymorphism is the occurrence of two or more clearly different morphs or forms, also referred to as alternative phenotypes, in the population of a species. Simply, polymorphism is when there are two or more possibilities of a trait on a gene.

Ants evolved over time, colonies became larger and more complex.

144916. The metallic component of chlorophyll

A

Mn

B

Mg

C

C

D

N

B

Correct Answer: B. Mg
Explanation: Formula of chlorophyll C55H72O5N4Mg

132617. Which one of the following plant tissues is composed of dead cells?

A

Parenchyma

B

Hypodermis

C

Xylem

D

Phloem

C

Correct Answer: C. Xylem
Explanation: Xylem mainly made up of dead cells and Xylem parenchyma is the only living cells present.

136118. A rhizome is a modified stem because

A

its stem is highly condensed and disc-like

B

it has nodes, internodes and has brown, scaly leaves

C

it grows vertically upward in the soil and it has fleshy leaves

D

it has nodes and it has eyes which bear germinating buds

D

Correct Answer: D. it has nodes and it has eyes which bear germinating buds

250119. What is the full form of NGT?

A

National Green Tribunal

B

National General Tribe

C

New General Tribunal

D

National Green Tribe

A

Correct Answer: A. National Green Tribunal

253020. What is Viticulture?

A

protection of forests

B

production of grapes

C

type of primitive agriculture

D

production of sugarcane

B

Correct Answer: B. production of grapes

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