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- Question
______ is a thyroid hormone which controls the balance of calcium in the body.
Options- A. Calcitonin
- B. Thyroxine
- C. Calmodulin
- D. all of these
- Correct Answer
- Calcitonin
ExplanationCalcitonin is 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells of the thyroid, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium, opposing the effects of parathyroid hormone.
- 1. Which of the following plays an important role in photosynthesis?
Options- A. Chloroplast
- B. Centrosome
- C. Tonoplast
- D. Nematoblast Discuss
- 2. The presence of air bubble in blood stream is dangerous to life because
Options- A. Air combines with blood forming a complex
- B. The flow of blood increases manifold
- C. The flow of blood is obstructed
- D. The pressure of blood increases manifold Discuss
- 3. The hormone that stimulates heart beat is
Options- A. Thyroxine
- B. Gastrin
- C. Glycogen
- D. Dopamine Discuss
- 4. Companion cells are unique to
Options- A. Bryophytes
- B. Pteridophytes
- C. Angiosperms
- D. Gymnosperms Discuss
- 5. Lacrymal glands are situated in the
Options- A. Palms
- B. Buccal cavity
- C. Buccal cavity
- D. Stomach Discuss
- 6. The cell wall in plants is interrupted by narrow pores carrying fine stands of cytoplasm which interlink the contents of the cells. These strands are called:-
Options- A. Plasmahole
- B. Microvilli
- C. Plasmodesmata
- D. Plasmalemma Discuss
- 7. An irregular mode of reproduction resulting in the development of an embryo without fertilization is called 1.Parthenogenesis 2.Apogamy 3.Sporophytic budding Select the correct answer using the code given below.
Options- A. 1 only
- B. 2 only
- C. 2 and 3 only
- D. 1, 2 and 3 Discuss
- 8. Deficiency of fluoride leads to Which one of the following health problems?
Options- A. Tooth caries
- B. Mottling of tooth
- C. Bending of bones
- D. Stiffening of joints Discuss
- 9. The xylem in plants are responsible for:
Options- A. transport of water
- B. transport of food
- C. transport of amino acids
- D. transport of oxygen Discuss
- 10. Which of the following bacterium causes crown gall disease in plants?
Options- A. Bacillus thurigiensis
- B. Agrobacterium tumefaciens
- C. Pseudomonas fluorescens
- D. None of these Discuss
Biology problems
Search Results
Correct Answer: Chloroplast
Correct Answer: The flow of blood is obstructed
Correct Answer: Thyroxine
Correct Answer: Angiosperms
Correct Answer: Buccal cavity
Correct Answer: Plasmodesmata
Explanation:
Plasmodesmata are interrupted by narrow pores carrying fine strands of cytoplasm, which interlink the contents of the cells.
Correct Answer: 1, 2 and 3
Explanation:
In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants parthenogenesis is a component process of apomixis.Apogamy is a type of reproduction, occurring in some ferns, in which the sporophytedevelops from the gametophyte without fusion of gametes.Adventitious embryony also called sporophytic budding, is a type of apomixis in which an embryo develops directly from nucellus or integument tissue.So, all three are correct.
Correct Answer: Tooth caries
Explanation:
Fluoride deficiency is a disorder which may cause increased dental caries due to a lack of fluoride in the diet. Dental caries or tooth decay is the breakdown of dental tissues by the acidic products released by the "bacterial fermentation of dietary carbohydrates?
Correct Answer: transport of water
Correct Answer: Agrobacterium tumefaciens
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