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- Question
The hormone that stimulates heart beat is
Options- A. Thyroxine
- B. Gastrin
- C. Glycogen
- D. Dopamine
- Correct Answer
- Thyroxine
- 1. Companion cells are unique to
Options- A. Bryophytes
- B. Pteridophytes
- C. Angiosperms
- D. Gymnosperms Discuss
- 2. Lacrymal glands are situated in the
Options- A. Palms
- B. Buccal cavity
- C. Buccal cavity
- D. Stomach Discuss
- 3. Xylem helps in transportation of which of the following?
Options- A. Food
- B. Water
- C. Nutrients
- D. Both food and water Discuss
- 4. 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
- 5. Which tissue makes the plant hard and stiff?
Options- A. Parenchyma
- B. Sclerenchyma
- C. Collenchyma
- D. Xylem Discuss
- 6. 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
- 7. Which of the following plays an important role in photosynthesis?
Options- A. Chloroplast
- B. Centrosome
- C. Tonoplast
- D. Nematoblast Discuss
- 8. ______ 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
- 9. 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
- 10. 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
Biology problems
Search Results
Correct Answer: Angiosperms
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: 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.
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.
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