11. Which among the following is not a connective tissue?
[A] Blood
[B] Skin
[C] Cartilage
[D] Bone
Show Answer
Correct Answer: B [Skin]
Notes:
The connective tissues include several types of fibrous tissue that vary only in their density and cellularity, as well as the more specialized and recognizable variants—bone, ligaments, tendons, cartilage, and adipose tissue. Skin is not a connective tissue. It is the body’s largest organ and consists of multiple layers, including the epidermis (outermost layer) and the dermis (deeper layer). Skin primarily serves as a protective barrier and regulates temperature, but it is mainly classified as an epithelial tissue due to its structure and function.
12. Night Blindness is caused by deficiency of which of the following Vitamins?
[A] Vitamin C
[B] Vitamin K
[C] Vitamin A
[D] Vitamin B
Show Answer
Correct Answer: C [Vitamin A]
Notes:
Night blindness is caused by nearsightedness, cataracts, or vitamin A deficiency. Night blindness (nyctalopia) is the inability to see well at night or in poor light. Its causes include glaucoma medications and cataracts
13. Which one of the following is a fast growing tree? (UPSC Prelims 1979).
[A] Teak
[B] Eucalyptus
[C] Banyan
[D] Coconut
Show Answer
Correct Answer: B [Eucalyptus]
Notes:
Eucalyptus is the fast growing tree. Most eucalyptus species have a root depth of 1.5-2.0 metre and its root system is more specifically adapted to using rain-fed soil moisture from the upper soil profile, rather than from the groundwater table at considerable depth. The plant is significant for wood availability, livelihood generation and carbon sequestration that address the challenges of global warming and climate change.
14. Pollination by which among the following is called as ornithophily?
[A] Rodents
[B] Aquatic animals
[C] Ants
[D] Birds
Show Answer
Correct Answer: D [Birds]
Notes:
Ornithophily refers to the pollination assisted by the birds. Ornithology is a branch of science which studies about birds. Dr. Salim Ali is a famous Indian ornithologist.
15. 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.
16. What is the approximate number of specific cells in the human body?
[A] 200 types
[B] 300 types
[C] 250 types
[D] 150 types
Show Answer
Correct Answer: A [200 types]
Notes:
Scientists estimate that the human body contains around 37 trillion cells and 200 different cell types. This includes 50 billion fat cells and 2 billion heart muscle cells. The number of bacterial cells inside a human body is around 38 trillion. This is much closer to the estimated 30 trillion human cells in the body.
Scientists used data reported by others about individual organs and some mathematical modeling to obtain their results.
17. Which of the following is the diploid chromosome number found in bryophytes?
[A] Spore mother cell
[B] Gametes
[C] Spores
[D] Meiospores
Show Answer
Correct Answer: A [Spore mother cell]
Notes:
Spore mother cell is the diploid chromosome number found in bryophytes.
18. The stalk becomes flattened, takes the shape of a leaf, and turns green in color, which of the following is it called?
[A] Leaf Spines
[B] Leaflet Hooks
[C] Leaf Roots
[D] Phyllode
Show Answer
Correct Answer: D [Phyllode]
Notes:
The stalk becomes flattened, takes the shape of a leaf, and turns green in color is called Phyllode.
19. The patterns of arrangement of leaves on the stem are called__?
[A] phyllotaxy
[B] Phyllode
[C] Leaf Roots
[D] Scale Leaves
Show Answer
Correct Answer: A [phyllotaxy]
Notes:
The pattern of arrangement of leaves on the stem is called phyllotaxy.
20. Bignonia unguiscati is an example of which of the following?
[A] Leaflet Hooks
[B] Leaf Roots
[C] Scale Leaves
[D] Leaf Spines
Show Answer
Correct Answer: A [Leaflet Hooks]
Notes:
Leaflet Hooks is the terminal leaflets of the leaf become modified into hook-like structures that help them to climb. Bignonia unguiscati is an example of this.
