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. The structure which helps in the nutrition of the Embryo is ____:
[A] Yolk sac
[B] Amniotic membrane
[C] Placenta
[D] Crypts
Show Answer
Correct Answer: A [Yolk sac]
Notes:
The yolk sac is a membranous sac attached to an embryo, providing early nourishment. It functions as the developmental circulatory system of the human embryo, before internal circulation begins. It carries out transfer of nutrients in weeks 2 and 3 when the uteroplacental circulation is established
32. Which organ of human body secretes Insulin?
[A] Liver
[B] Kidney
[C] Pancreas
[D] Gall bladder
Show Answer
Correct Answer: C [Pancreas]
Notes:
Insulin is a hormone secreted by the pancreas that is important for metabolism and utilization of energy from the ingested nutrients – especially glucose. It keeps our blood sugar level from getting too high (hyperglycemia) or too low (hypoglycemia). The pancreas is a glandular organ in the digestive system and endocrine system of vertebrates.
33. What determines the activity of enzymes in a biochemical reaction?
[A] Their density and mass
[B] Their three-dimensional structure
[C] Number of amino acid residues
[D] Types of substrate they bind to
Show Answer
Correct Answer: B [Their three-dimensional structure]
Notes:
The activity of enzymes, which are generally globular proteins, is determined by their three-dimensional structure. This structure allows them to bind to a substrate and catalyze their involvement in a reaction. Enzymes vary in size, ranging from 62 amino acid residues for the monomer of 4-oxalocrotonate tautomerase, to over 2,500 residues in animal fatty acid synthase. Their specific ability to bind to substrates enables reactions to occur in the body, playing a crucial role in metabolism.
34. The largest artery in human body is _____:
[A] Vena cava
[B] Aorta
[C] Pulmonary vein
[D] Capillary
Show Answer
Correct Answer: B [Aorta]
Notes:
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
35. Blue Revolution is related to ____:
[A] Poultry
[B] Space research
[C] Drinking water
[D] Fisheries
Show Answer
Correct Answer: D [Fisheries]
Notes:
• Green revolution- Crop production
• Golden revolution- Honey /Tomato production.
• Blue revolution- Fish production
• Silver revolution- Egg production
• White revolution Milk production or Operation flood
36. The deciduous trees will _____:
[A] Shed their leaves every year
[B] Not lose their leaves
[C] Synthesise their own food
[D] Depend on others for their food
Show Answer
Correct Answer: A [Shed their leaves every year]
Notes:
Deciduous means “falling off at maturity” or “tending to fall off”. Deciduous trees or shrubs lose their leaves seasonally. The converse of deciduous is evergreen.
37. 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.
38. Which of the following correctly explains the phenomenon of “Test Tube Baby”?
[A] When the fertilisation is external and development is internal
[B] When every process of embryo formation is in the test tube
[C] When the embryo develops in a test tube
[D] When the fertilisation is internal and development is external
Show Answer
Correct Answer: A [When the fertilisation is external and development is internal]
Notes:
Test tube baby is born from in vitro fertilization. In vitro fertilization (IVF) is a process by which an egg is fertilized by sperm outside the body: in vitro. When a woman’s natural cycle is monitored to collect a naturally selected ovum (egg) for fertilization, it is known as natural cycle IVF. The fertilized egg (zygote) is then transferred to the patient’s uterus with the intention of establishing a successful pregnancy.
39. Which of the following cell organelle is responsible for cellular respiration?
[A] Golgi bodies
[B] Mitochondria
[C] Lysosomes
[D] Nucleus
Show Answer
Correct Answer: B [Mitochondria]
Notes:
Cellular respiration takes place in the mitochondria. Cellular respiration allows for the release of energy stored in chemical bonds of glucose (obtained from food) to form adenosine triphosphate, which is the energy currency of the cell. For every molecule of glucose, 36 molecules of ATP are made.
40. How many number of chambers are there in human heart?
[A] Two
[B] Three
[C] Four
[D] Five
Show Answer
Correct Answer: C [Four]
Notes:
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. The human heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles).
