Multiple Choice Quiz Questions (MCQs) on General Science for General Studies and GK preparation of SSC, NDA, CDS, UPSC and State PSC Exams

21. Which of the following nonpathogenic products is used in various crops as well as horticulture and ornamental plants?

[A] Azotobacter

[B] Fungi

[C] Tricho-Card

[D] None of these

Answer: C [Tricho-Card]

Notes:

Tricho-Card is a nonpathogenic product that is used in various crops as well as horticulture and ornamental plants.

22. The conversion of N2 to ammonia is known as __

[A] Nitrification

[B] Nitrogen fixation

[C] Ammonification

[D] DE nitrification

Answer: B [Nitrogen fixation]

Notes:

The conversion of N2 to ammonia is known as Nitrogen fixation.

23.____ is the cell organelle, in which the biochemical processes of respiration and energy production occur:

[A] Ribosomes

[B] Mitochondria

[C] Nucleus

[D] Chloroplast

Answer: B [Mitochondria]

Notes:

Mitochondria are an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It is for this reason that mitochondria are often referred to as the powerhouses of the cell mitochondria also play a key role in the ageing process as well as in the onset of degenerative disease.

24. Which gas is major contributor to greenhouse effect?

[A] Chlorofluorocarbon

[B] Nitrogen dioxide

[C] Sulphur dioxide

[D] Carbon dioxide

Answer: D [Carbon dioxide]

Notes:

Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). These gases contribute to atmospheric warming when they absorb infrared radiation emitted by the solar-warmed Earth and transfer their extra energy to the surrounding atmospheric gases.

25. In which of the following multiple epidermis is found?

[A] Boerhaavia

[B] Nerium

[C] Amaranthus

[D] Helianthus

Answer: B [Nerium]

Notes:

It is assumed that protodermal cells divide periclinally in certain cases to form multiseriate or multiple epidermis. The multiple epidermis is found in some organs like roots of orchids (Vanda), leaves of Ficus, Nerium, Piperomia, etc. In Nerium, it is found on both surfaces.

26. Which of the following acids is synthesized in human stomach?

[A] Hydrochloric acid

[B] Sulphuric acid

[C] Nitric acid

[D] Phosphoric acid

Answer: A [Hydrochloric acid]

Notes:

A typical adult human stomach will secrete about 1.5 liters of gastric acid daily. The best-known component of gastric juice is hydrochloric acid, the secretory product of the parietal, or oxyntic cell. It is known that the capacity of the stomach to secrete HCl is almost linearly related to parietal cell numbers.

27. Which of the following is a form of sexual reproduction?

[A] Fission

[B] Budding

[C] Fragmentation

[D] Haemapheoditism

Answer: D [Haemapheoditism]

Notes:

Hermaphroditism is a form of sexual reproduction. Hermaphrodite is an organism that has reproductive organs normally associated with both male and female sexes. Hermaphroditic plants—most flowering plants, or angiosperms—are bisexual. Hermaphroditic animals—mostly invertebrates such as worms, moss animals, trematodes, snails, slugs etc are usually parasitic, permanently attached to another animal or plant.

28. A seed can germinate in the absence of ____:

[A] Suitable moisture

[B] Suitable temperature

[C] Adequate light

[D] Supply of oxygen

Answer: C [Adequate light]

Notes:

A seed can germinate in the absence of adequate light. It’s only photoblastic seeds which need light exposure for germination such lettuce, maize, etc. Small seeds generally germinate better in light than in darkness, while large seeds do not exhibit a difference in germination between these two conditions (Milberg et al. 2000. 2000. Large seeded species are less dependent on light for germination than small-seeded ones.

29.Deficiency of iron causes ____:

[A] Goitre

[B] Anemia

[C] Rickets

[D] Scurvy

Answer: B [Anemia ]

Notes:

Goitre: swelling of the neck or larynx resulting from enlargement of the thyroid gland due to iodine deficiency; Anemia: Iron deficiency anemia is a common type of anemia — a condition in which blood lacks adequate healthy red blood cells. Red blood cells carry oxygen to the body’s tissues. As the name implies, iron deficiency anemia is due to insufficient iron; Rickets: defective mineralization of bones due to deficiency or impaired metabolism of vitamin D; Scurvy: a disease resulting from a deficiency of vitamin C.

30.Which of the following became first Indigenously developed vaccine from India to be pre-qualified by World Health Organisation?

[A] Hemophile

[B] Pentavac

[C] Rotavac

[D] Pneumococca

Answer: C [Rotavac]

Notes:

Rotavac, in January 2018, became first Indigenously developed vaccine from India to be pre-qualified by World Health Organisation (WHO). It means that vaccine can be sold internationally to several countries in South America and Africa. Rotavac has been conceived and developed by the Hyderabad based Bharat Biotech Limited.

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