General Science Questions (MCQs) for Competitive Examinations
General Science Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations. These questions are part of GKToday’s 35000+ MCQs Bank Course in GKToday Android App
31. Which of the following carry the blood from all parts of body back to the heart?
[A] White Blood Cells
[B] Veins
[C] Arteries
[D] Platelets
Show Answer
Correct Answer: B [Veins]
Notes:
A vein is an elastic blood vessel that transports blood from various regions of the body to the heart. Veins are components of the cardiovascular system, which circulates blood to provide nutrients to the cells of the body. Veins can be categorized into four main types: pulmonary, systemic, superficial, and deep veins.
32. Which of the following is a monogenetic parasite?
[A] Hydra
[B] Earthworm
[C] Fasciola
[D] Ascaris
Show Answer
Correct Answer: D [Ascaris]
Notes:
Monogenetic parasites are the parasites that complete their life cycles in one host only. Ascaris is a monogenetic parasite as it completes it life cycle in a single host, i.e., man.
33. Stamens are fused with each other by their anthers and also with the petals in _____:
[A] Compositae
[B] Liliaceae
[C] Euphorbiaceae
[D] Leguminosae
Show Answer
Correct Answer: A [Compositae]
Notes:
The loose union of structure of the same whorl is called cohesion, but the intimate histological union is called connation. When anthers are fused with each other, the condition is described as syngenesious e.g., Compositae, Lobeliaceae. This fusion is called cohesion. When there is fusion of stamens with petals, they are described as epipetalous e.g., Gamopetale.
34. The waste management technique that involves the use of micro-organisms to remove or neutralize pollutants from contaminated site is called ____:
[A] Bio magnification
[B] Bio sensor
[C] Bioremediation
[D] Bio concentration
Show Answer
Correct Answer: C [Bioremediation]
Notes:
Bioremediation is a waste management technique that involves the use of organisms to remove or neutralize pollutants from a contaminated site. It uses naturally occurring organisms to break down hazardous substances into less toxic or non-toxic substances. There are two classes of bioremediation used : In situ and Ex situ.
35. Pollination by birds is called ______:
[A] Anemophily
[B] Ornithophily
[C] Entomophily
[D] Autogamy
Show Answer
Correct Answer: B [Ornithophily]
Notes:
Ornithophily refers to the pollination of flowering plants by birds. Birds involved in ornithophily tend to be specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.
36. Which of the following is an abiotic component of environment?
[A] Green plants
[B] Gravity
[C] Non-green plants
[D] Decomposers
Show Answer
Correct Answer: B [Gravity]
Notes:
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an ecosystem. All non-living components of an ecosystem is called abiotic components such as temperature, light, moisture, air currents, gravity, etc.
37. The main function of palisade parenchyma in leaf is _____:
[A] Pollutants
[B] Antibiotics
[C] Hormones
[D] Toxins
Show Answer
Correct Answer: D [Toxins]
Notes:
Palisade parenchyma is the layer of tissue directly beneath the epidermis of the upper surface of a leaf. It contains the cylinder-shaped cells that hold the chloroplasts and constitutes the primary area of photosynthesis that converts the light energy to the chemical potential energy of carbohydrates.
38. Where do plants synthesize protein from?
[A] Fatty Acids
[B] Amino Acids
[C] Starch
[D] Sugar
Show Answer
Correct Answer: B [Amino Acids]
Notes:
Amino acids are the molecular building blocks of proteins. So proteins are synthesized from them. Essential amino acids are histidine, isoleucine, leucine, methionine, phenylalanine, threonine, tryptophan, valine, lysine.
39. Some of the ingredients required for bread making are _____:
[A] Maida and Baking Powder
[B] Maida and Ghee
[C] Maida and Baking Soda
[D] Maida and Yeast
Show Answer
Correct Answer: D [Maida and Yeast]
Notes:
Salt, fat and leavening agents such as yeast and baking soda are common ingredients, though bread may contain other ingredients also. Yeast plays an important role in bread-making. It ferments and grows when combined with “food” such as flour and/ or sugar, and warmed. Carbon dioxide is produced and trapped in the dough as tiny air bubbles which make the bread rise during cooking and give it its characteristic texture.
40. BCG vaccination is given at the age of _____:
[A] 10 years
[B] 2-3 years
[C] Newborn
[D] Within 15 days
Show Answer
Correct Answer: D [Within 15 days]
Notes:
Bacillus Calmette Guerin is a vaccine against tuberculosis. BCG vaccine can be implemented after the birth intradermally within 2-3 days.