11. Serology is related to which of the following statements?
[A] Study of dietetics
[B] Study of snakes
[C] Study of serum
[D] Study of seeds
Show Answer
Correct Answer: C [Study of serum]
Notes:
Serology is the study of blood serum (the clear fluid that separates when blood clots).
12. The scientific study of organisms as affected by seasonal climates e.g. of bird migration, the opening of flowers, etc is called __?
[A] Phenology
[B] Phylogeny
[C] Phrenology
[D] Phycology
Show Answer
Correct Answer: A [Phenology]
Notes:
The scientific study of organisms as affected by seasonal climates e.g. of bird migration, the opening of flowers etc is called Phenology.
13. In which of the following organisms is the nuclear membrane absent?
[A] Nostoc
[B] Volvox
[C] Agaricus
[D] Penicillium
Show Answer
Correct Answer: A [Nostoc]
Notes:
Nostoc, also known as star jelly, troll’s butter, witch’s butter, and witch’s jelly, is a genus of cyanobacteria. Nostoc does not have a nuclear membrane. This is a characteristic of prokaryotic cells, which lack a nucleus. The genetic material in these cells is found in the cytoplasm, not enclosed within a nuclear membrane. On the contrary, Volvox, Agaricus, and Penicillium are all eukaryotic organisms, hence possess a nuclear membrane.
14. Which of the following happens in Gram-positive cells?
[A] second outer membrane that helps to retain the crystal violet stain
[B] multiple layer of peptidoglycan that helps to retain the crystal violet stain
[C] thick capsule that traps the crystal violet stain
[D] periplasmic space that traps the crystal violet
Show Answer
Correct Answer: B [multiple layer of peptidoglycan that helps to retain the crystal violet stain]
Notes:
Multiple layer of peptidoglycan that helps to retain the crystal violet stain is happens in Gram-positive cells. Gram-positive organisms have a thicker peptidoglycan cell wall than Gram-negative bacteria.
15. What is the arrangement of ovules inside the ovary called?
[A] Aestivation
[B] Placentation
[C]
Hibernation
[D] Fragmentation
Show Answer
Correct Answer: B [Placentation]
Notes:
The arrangements of ovules within the ovary are known as placentation.
16. A condition in which the stamens are attached to the petals of a flower instead of directly attached to the thalamus is called__?
[A] Epipetalous
[B] Monadelphous
[C] Staminode
[D] Epiphyllous
Show Answer
Correct Answer: A [Epipetalous]
Notes:
A condition in which the stamens are attached to the petals of a flower instead of directly attached to the thalamus is called Epipetalous. Solanum is an example of Epipetalous.
17. Which of the following layer of the cell forms the outer covering of all the structures in the plant?
[A] Cork
[B] Epidermis
[C] Sclerenchyma
[D] Collenchyma
Show Answer
Correct Answer: B [Epidermis]
Notes:
The epidermis layer of the cell forms the outer covering of all the structures in the plant.
18. The structural unit of photosynthesis is___.
[A] Thylakoid
[B] Grana
[C] Chlorophyll
[D] None
Show Answer
Correct Answer: A [Thylakoid]
Notes:
Thylakoid is the structural unit of photosynthesis and it is present in the stroma, stroma is present in the inner structure of the chloroplast.
19. What is the role of indole acetic acid in plant growth?
[A] cell division and elongation
[B] tissue differentiation
[C] apical dominance
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Indole acetic acid is the main auxin in plants that regulates growth and development processes such as cell division and elongation, tissue differentiation, apical dominance, and responses to light, gravity, and pathogens.
20. Which of the following are examples of tap root systems?
[A] Mustard
[B] Carrots
[C] Beetroot
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Taproots have one main central root. These are attached to small, lateral roots called root hairs. Mustard, carrot, beet, parsley, Chinese rose and all are examples of dicotyledonous roots.
