Discussion
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- Question
Companion cells are unique to
Options- A. Bryophytes
- B. Pteridophytes
- C. Angiosperms
- D. Gymnosperms
- Correct Answer
- Angiosperms
- 1. Lacrymal glands are situated in the
Options- A. Palms
- B. Buccal cavity
- C. Buccal cavity
- D. Stomach Discuss
- 2. Xylem helps in transportation of which of the following?
Options- A. Food
- B. Water
- C. Nutrients
- D. Both food and water Discuss
- 3. Which of the following is a work done by the placenta tissue in humans?
Options- A. Support the embryo
- B. Removes waste matter from the embryo and provide nutrition to the embryo
- C. Provide nutrition to the embryo
- D. Remove waste matter from the embryo Discuss
- 4. Which tissue makes the plant hard and stiff?
Options- A. Parenchyma
- B. Sclerenchyma
- C. Collenchyma
- D. Xylem Discuss
- 5. Which of the following is not a characteristic of Pisces?
Options- A. Exoskeleton of scales
- B. Breathing through gills
- C. Endoskeleton of bone/cartilage
- D. Presence of pseudocoelom Discuss
- 6. The hormone that stimulates heart beat is
Options- A. Thyroxine
- B. Gastrin
- C. Glycogen
- D. Dopamine Discuss
- 7. 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
- 8. Which of the following plays an important role in photosynthesis?
Options- A. Chloroplast
- B. Centrosome
- C. Tonoplast
- D. Nematoblast Discuss
- 9. ______ is a thyroid hormone which controls the balance of calcium in the body.
Options- A. Calcitonin
- B. Thyroxine
- C. Calmodulin
- D. all of these Discuss
- 10. 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
Biology problems
Search Results
Correct Answer: Buccal cavity
Correct Answer: Water
Correct Answer: Removes waste matter from the embryo and provide nutrition to the embryo
Correct Answer: Sclerenchyma
Correct Answer: Presence of pseudocoelom
Correct Answer: Thyroxine
Correct Answer: The flow of blood is obstructed
Correct Answer: Chloroplast
Correct Answer: Calcitonin
Explanation:
Calcitonin 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.
Correct Answer: Plasmodesmata
Explanation:
Plasmodesmata are interrupted by narrow pores carrying fine strands of cytoplasm, which interlink the contents of the cells.
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