31. Heart disease and High blood pressure are examples of which genetic disorder?
[A] Chromosomal Disorder
[B] Mitochondrial Inheritance
[C] Multifactorial Genetic Inheritance
[D] None of these
Show Answer
Correct Answer: C [Multifactorial Genetic Inheritance]
Notes:
Heart disease and High blood pressure are examples of Multifactorial Genetic Inheritance. It is also known as polygenic inheritance.
32. Which chemical fertilizer is needed for better rhizobial nitrogen fixation?
[A] Phosphorus
[B] Potassium
[C] Calcium
[D] Sodium
Show Answer
Correct Answer: A [Phosphorus]
Notes:
Phosphorus is the essential chemical fertilizer for better rhizobial nitrogen fixation.
33. A process in which earthworms convert organic waste into manure rich in high nutritional content is called
[A] Farmyard manure
[B] Bio Compost
[C] Vermicomposting
[D] Green manure
Show Answer
Correct Answer: C [Vermicomposting]
Notes:
A process in which earthworms convert organic waste into manure rich in high nutritional content is called Vermicomposting.
34. The ____ is the stem-like part of the leaf that joins the blade to the stem, is known as:
[A] Vein
[B] Petiole
[C] Stipules
[D] Midrib
Show Answer
Correct Answer: B [Petiole]
Notes:
The petiole is the stalk-like structure which connects the leaf blade to the stem. The petiole has tiny tubes, that connect the veins on the leaf blade to the stem. Few of these enable water transport to the leaf while the other carry food away from the leaf to other parts of the plant.
35. What does Insulin do?
[A] Increases blood sugar
[B] Decreases blood sugar
[C] Constricts blood vessels
[D] Stimulates lactation
Show Answer
Correct Answer: B [Decreases blood sugar]
Notes:
Insulin is central to regulating carbohydrate and fat metabolism in the body. It stops the use of fat as an energy source by inhibiting the release of glucagon. It removes excess glucose from the blood, which otherwise would be toxic. Insulin helps blood sugar enter the body’s cells so it can be used for energy. Insulin also signals the liver to store blood sugar for later use. Blood sugar enters cells, and levels in the bloodstream decrease, signaling insulin to decrease too.
36. Which angiosperm is vesselless?
[A] Maize
[B] Trochodendron
[C] Hydrilla
[D] Wheat
Show Answer
Correct Answer: B [Trochodendron]
Notes:
Trochodendron is a genus of flowering plants with one living species. It is vesselless angiosperm. Fewer than 200 species of angiosperms have the primitive feature of vesselless wood. With two exceptions— Trochodendron and Tetracentron; all vesselless angiosperms occur in the Magnolidae.
37. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
38. Itai-itai disease is due to poisoning caused by _____:
[A] Cadmium
[B] Asbestos
[C] Arsenic
[D] Mercury
Show Answer
Correct Answer: A [Cadmium]
Notes:
Itai-itai disease was the documented case of mass cadmium poisoning in Toyama Prefecture, Japan, starting around 1912. The cadmium poisoning caused softening of the bones and kidney failure. This disease is the most severe form of chronic Cd poisoning caused by prolonged oral Cd ingestion. It developed in numerous inhabitants of the Jinzu River basin in Toyama Prefecture, Japan, an area most severely polluted by Cd that originated from a zinc mine located upstream.
39. ___ is a scientific discipline concerned with the study of plant pollen, spores, and certain microscopic plank-tonci organisms, in both, living and fossil form:
[A] Palynology
[B] Paleobotany
[C] Dendrology
[D] Ethnobotany
Show Answer
Correct Answer: A [Palynology]
Notes:
Palynology is the scientific discipline concerned with the study of plant pollen, spores, and certain microscopic planktonic organisms, by this way diatom, in both living and fossil form. It is associated with the plant sciences as well as with the geologic sciences, notably those aspects dealing with stratigraphy, historical geology, study of organic microfossils (palynomorphs) extracted from ancient coals, paleontology and archaeology.
40. Muscle fatigue occurs due to accumulation of ____:
[A] Carbonic Acid
[B] Lactic Acid
[C] ATP
[D] ADP
Show Answer
Correct Answer: B [Lactic Acid]
Notes:
Muscle fatigue refers to the decline in muscle force generated over time. Several factors contribute to muscle fatigue, the most important being lactic acid accumulation. Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of O2.