11. The young chicks come out of eggs within how many days after being hatched by the hen?
[A] One week
[B] Two weeks
[C] Three weeks
[D] Four weeks
Show Answer
Correct Answer: C [Three weeks]
Notes:
A hen that is committed to hatching chicks is known as a broody. The state of being broody is controlled by instinct, hormones and lighting conditions. Chicken come out of the eggs within the 21 days after being hatched by the hen. Some breeds take a little less and some a little longer. If the egg has not hatched after 25 days, it should be removed from the broody hen or incubator. Eggs need constant heat during the full incubation period for the embryo to develop into a chick.
12. Retina in the eyes acts as which of the following parts of the camera? (UPSC Prelims 1982)
[A] Lens of the camera
[B] Shutter of the camera
[C] Film of the camera
[D] None of these
Show Answer
Correct Answer: C [Film of the camera]
Notes:
The retina is a thin membrane which covers the inside back of the eye. Like film in a camera, the retina is the light-sensitive surface where images from the outside world come to a focus.
13. How many bones are present in healthy adult human being?
[A] 205
[B] 207
[C] 206
[D] 208
Show Answer
Correct Answer: C [206]
Notes:
An adult human skeleton comprises of 206 bones which is greater than the number of bones present at birth. This is due to the fusing of bones as one grows up. The bone density in the human body reaches maximum at the age of 21.
14. Which of the following branch of biology deals with the study of pollen grains?
[A] Psychology
[B] Palynology
[C] Pathology
[D] Parasitology
Show Answer
Correct Answer: B [Palynology]
Notes:
Palynology is the study of pollen grains produced by seed plants and spores. It represents the land flora and can be used in many different disciplines.
15. Phototropism Theory is related to which of the following scientist?
[A] Jane Goodall
[B] Charles Darwin
[C] Francis Galton
[D] None of these
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
Plant physiologists have investigated phototropism for over 100 years. The best known early research on phototropism was by Charles Darwin.
16. Who among the following discovered Vitamin C?
[A] Albert Szent-Györgyi
[B] Funk
[C] Evans and Bishop
[D] Henrik Dam
Show Answer
Correct Answer: A [Albert Szent-Györgyi]
Notes:
Albert Szent-György is the scientist who discovered Vitamin C. Vitamin C is a water-soluble vitamin. The chemical name is Ascorbic acid.
17. Which of the following organelles is absent in animal cells and present in plant cells?
[A] Cytoplasm
[B] Cell wall
[C] Vacuoles
[D] Mitochondria
Show Answer
Correct Answer: B [Cell wall]
Notes:
The cell wall surrounds the plasma membrane of plant cells. The cell wall is a fairly rigid layer that surrounds a cell located outside the plasma membrane.
18. Which of the following is a common feature of protonema of multicellular fungi, filamentous algae, and mosses?
[A] way of nutrition
[B] diplomatic life cycle
[C] multiply by fragmentation
[D] members of the plant kingdom
Show Answer
Correct Answer: C [multiply by fragmentation]
Notes:
The protonema of multicellular fungi, filamentous algae and mosses all show multiplication by fragmentation.
19. To which plant kingdom does Wolffia belong?
[A] Angiosperms
[B] Gymnosperms
[C] Pteridophytes
[D] None of these
Show Answer
Correct Answer: A [Angiosperms]
Notes:
Wolffia belong to Angiosperms. Angiosperms are seed-bearing vascular plants that have a well-differentiated plant body. The seeds of angiosperms are enclosed within the fruit.
20. The cytoplasmic membrane of which of the following organisms contains sterols?
[A] Clostridum
[B] Proteus
[C] Mycoplasma
[D] Bacillius
Show Answer
Correct Answer: C [Mycoplasma]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
