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. RBCs do not perform aerobic respiration because these do not contain _____:
[A] Nucleus
[B] Lysosomes
[C] Mitochondria
[D] Endoplasmic Reticulum
Show Answer
Correct Answer: C [Mitochondria]
Notes:
Red Blood Corpuscles (RBCs) do not contain mitochondria when matured. These are the site of aerobic respiration. They they also lack the oxidative enzymes that are required for aerobic respiration. For this reason, Embden-Meyerhof pathway is used to process glucose and thus obtain energy. This is an anaerobic energy producing process that has been shown to use glycogen in the absence of glucose.
32. A specific function of light energy in the process of photosynthesis is to ____:
[A] Reduce CO2
[B] Absorb water
[C] Formation of oxygen
[D] Activate chlorophyll
Show Answer
Correct Answer: D [Activate chlorophyll]
Notes:
The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.
33. A plant with 30 cm or more circumference from human chest height is identified as _____:
[A] Herb
[B] Shrub
[C] Tree
[D] Medicinal herbs
Show Answer
Correct Answer: D [Medicinal herbs]
Notes:
Mostly medicinal herbs grown from 30 to 90 cm in height. They reach up to 30 cm in diameter.
34. Chlorophyll containing autotrophic thallophytes is called as _____:
[A] Algae
[B] Lichens
[C] Fung
[D] Bryophytes
Show Answer
Correct Answer: A [Algae]
Notes:
Algae are chlorophyll (green pigment) containing thallophytes. They prepare their own food and are thus autotrophic in their mode of nutrition. Even liverworts among Bryophytes such as Riccia and Marchantia have thaloid structure.
35. The plants, which grow under water stress conditions of deserts are _____:
[A] Sciophytes
[B] Heliophytes
[C] Epiphytes
[D] Xerophytes
Show Answer
Correct Answer: D [Xerophytes]
Notes:
The term xerophyte refers to a plant species that has evolved over time to adapt to dry and arid regions like deserts. Xerophytes have adapted to be able to keep extremely large amounts of water for a long period of time. Without this capability, the plant would die, as the desert region itself does not provide enough water to sustain life. They have thick cuticle, sunken stomata and leaves modified in form of spines such as in opuntia.
36. Which of the following is not an endocrine gland?
[A] Pituitary
[B] Thyroid
[C] Adrenal
[D] Spleen
Show Answer
Correct Answer: D [Spleen]
Notes:
The spleen is not an endocrine gland. This is because the spleen is not capable of aiding in the regulation of the hormone levels in the human body.
37. What is the distinctive characteristic of marsupials?
[A] They hibernate in winter
[B] They lay eggs
[C] They migrate from one place to another
[D] They carry young ones in pouches
Show Answer
Correct Answer: D [They carry young ones in pouches]
Notes:
Marsupial, any of more than 250 species belonging to the infraclass Metatheria, a mammalian group characterized by premature birth and continued development of the newborn while attached to the nipples on the mother’s lower belly. The pouch—or marsupium, from which the group takes its name—is a flap of skin covering the nipples. Well-known marsupials include kangaroos, wallabies, koalas, possums, etc.
38. The five kingdom concept of classification of organisms was given by ____:
[A] Charles Darwin
[B] Carl Woese
[C] William Paley
[D] Robert Whittaker
Show Answer
Correct Answer: D [Robert Whittaker]
Notes:
R.H. Whittaker (1969) proposed a Five Kingdom Classification: Monera, Protista, Fungi, Plantae and Animalia. The main criteria for classification used by him include cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships.
39. Which of the following is not a constituent of phloem?
[A] Tracheids
[B] Sieve tubes
[C] Companion cells
[D] Phloemparenchyma
Show Answer
Correct Answer: A [Tracheids]
Notes:
The constituents of phloem are Sieve tubes, Companion cells, Phloem parenchyma, Phloem fibres. Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. These are elongated narrow tube like cells with hard thick and lignified walls with large cell cavity.
40. According to World Wide Fund, which of the following river of India is one of the ten most endangered rivers in the world?
[A] River Jamuna
[B] River Ganges
[C] River Brahamputra
[D] River Godavari
Show Answer
Correct Answer: B [River Ganges]
Notes:
As per the report of WWF the ten most endangered rivers emerge as: the Salween, La Plata, Danube, Rio Grande, Ganges, Murray-Darling, Indus, Nile, Yangtze and Mekong.
