31. Which of the following statement is incorrect?
[A] Budding is not possible in hydra
[B] Hydra have only a sexual reproduction
[C] Most frogs are an oviparous animals
[D] Internal fertilisation takes place in hens
Show Answer
Correct Answer: B [Hydra have only a sexual reproduction]
Notes:
Hydra is radially symmetrical, that is, the parts of its body are arranged in a circle around a central median axis passing through the mouth. Hydra reproduces by asexual and sexual methods. Asexual reproduction takes place either by budding or by fission.
32. Which one of the following substances is normally found in urine?
[A] White blood cells
[B] Red blood cells
[C] Blood proteins
[D] Creatinine
Show Answer
Correct Answer: D [Creatinine]
Notes:
Creatinine is a chemical waste molecule that is generated during muscle metabolism. It is transported through the bloodstream to the kidneys. The kidneys filter out most of the creatinine and dispose it off in the urine. High levels of creatinine indicates of possible malfunction or failure of the kidneys. The presence of any type of blood cells as deducted by KFT (Kidney Functional Test) directly indicate the severe state of kidney functioning.
33. Normal fasting blood sugar level per 100 ml. of blood in man is _____:
[A] 30 – 50 mg
[B] 50 – 70 mg
[C] 80 -100 mg
[D] 120 -140 mg
Show Answer
Correct Answer: C [80 -100 mg]
Notes:
The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. The body naturally tightly regulates blood glucose levels as a part of metabolic homeostasis. The mean normal blood glucose level in humans is about 4 mM (4 m mol/L or 72 mg/dL, i.e. milligrams/decilitre); however, this level fluctuates throughout the day.
34. Which of the following does not act both as an exocrine gland and as an endocrine gland?
[A] Pituitary
[B] Ovary
[C] Pancreas
[D] Testis
Show Answer
Correct Answer: A [Pituitary]
Notes:
Pituitary gland only acts pure endocrine gland secreting only hormones. The three others i.e. pancreas and gonads secrete extra cellular enzymes and factors too like gametes by gonads.
35. Which of the following microorganisms is used in milk curdling?
[A] Bacillus
[B] Lactobacillus
[C] Leuconostoc
[D] Acetobacter
Show Answer
Correct Answer: B [Lactobacillus]
Notes:
Lactobacillus acidiphilous is used in milk curdling by producing lactic acid and reducing the pH of the milk. These bacteria convert the lactose into lactic acid, which imparts the sour taste to curd. It is a genus of Gram positive facultative anaerobic or microaerophilic rod-shaped bacteria.
36. Which of the following is a communicable disease?
I. Malaria
II. Tuberculosis
III. Measles
[A] Only II
[B] Only III
[C] Both I and III
[D] Both II and III
Show Answer
Correct Answer: D [Both II and III]
Notes:
Malaria is a life-threatening mosquito-borne blood disease caused by a Plasmodium parasite. It is transmitted to humans through the bite of the Anopheles mosquito. Tuberculosis (TB) is an infectious disease usually caused by the bacterium Mycobacterium tuberculosis. Measles is a highly contagious infection caused by the measles virus.
37. Meningitis is a disease which affects the ____:
[A] Kidneys
[B] Liver
[C] Heart
[D] Brain
Show Answer
Correct Answer: D [Brain]
Notes:
Meningitis is an inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges. The inflammation may be caused by infection with bacteria.
38. Process through which plants reproduce _____:
[A] Eating
[B] Pollination
[C] Condensation
[D] Evaporation
Show Answer
Correct Answer: B [Pollination]
Notes:
Pollination is the process by which pollen is transferred from the anther (male part) to the stigma (female part) of the plant, thereby enabling fertilization and reproduction. This takes place in the angiosperms, the flower bearing plants.
39. Hydroponics is a method of culture of plants without using ____:
[A] Water
[B] Soil
[C] Light
[D] Sand
Show Answer
Correct Answer: B [Soil]
Notes:
Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Plants are grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, expanded clay pebbles or coconut husk. The method is adopted to study the effect of mineral deficiency of a macro or micronutrient on a plant.
40. Taxonomy is a science that deals with ____:
[A] Anatomy
[B] Morphology
[C] Economic uses
[D] Classification
Show Answer
Correct Answer: D [Classification]
Notes:
Taxonomy is the academic discipline of defining groups of biological organisms on the basis of shared characteristics and giving names to those groups. Each group (taxon) is given a rank and groups of a given rank can be aggregated to form a super group of higher rank and thus create a hierarchical classification. Carlous Linneaus is considered as father of taxonomy.