11. Which of following is the primary photosynthetic pigment?
[A] Chlorophyll-b
[B] Carotenoid
[C] Chlorophyll-a
[D] Anthocyanin
Show Answer
Correct Answer: C [Chlorophyll-a]
Notes:
Chlorophylla-a is the primary pigment for photosynthesis in plants. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light.
12. Which one of the following is the sweetest natural sugar ?
[A] Lactose
[B] Glucose
[C] Sucrose
[D] Fructose
Show Answer
Correct Answer: D [Fructose]
Notes:
Fructose, or fruit sugar, is a simple ketonic monosaccharide found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galactose, that are absorbed directly into blood during digestion.
13. Which organs have different basic structures, yet present a similarity in appearance and perform analogous functions?
[A] Kidney and liver
[B] Heart and lungs
[C] Wings of a bat and a bird
[D] Brain and spinal cord
Show Answer
Correct Answer: C [Wings of a bat and a bird]
Notes:
This is a unique example of convergent evolution in which organs can serve similar purposes but originate from very different original structures. Wings of a bat and bird serve the same purpose, flight, yet they have different underlying structures, resulting from a different evolutionary path.
14. Which of the following facts is true regarding Colour blindness?
[A] More common among women
[B] Very rare in women
[C] Very rare in men
[D] Found to the same extent in both the sexes
Show Answer
Correct Answer: B [Very rare in women]
Notes:
Color blindness occurs when light-sensitive cells in the retina fail to respond appropriately to variations in wavelengths of light that enable people to see an array of colors. Photoreceptors in the retina are called rods and cones. It is very rare in women.
15. Leslie Orgel was known for discovering which of the following?
[A] life was based on RNA
[B] life was based on protien
[C] life was based on DNA
[D] None of these
Show Answer
Correct Answer: A [life was based on RNA]
Notes:
In the late 1960s, Orgel proposed that life was based on RNA before being based on DNA or proteins. His theory included genes based on RNA and RNA enzymes.
16. Who among the following discovered evolution first?
[A] Herbert Spencer
[B] Charles Darwin
[C] E. O. Wilson
[D] None of these
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
Charles Darwin is known as the “Father of Evolution” because he was the founder of the modern theory of evolution.
17. In gymnosperms, pollen drop is the__?
[A] Red drop
[B] Pollens dropped by wind
[C] Secretion of nucellus
[D] Water drops
Show Answer
Correct Answer: C [Secretion of nucellus]
Notes:
In gymnosperms, the pollen drop is a liquid droplet or a liquid nucellus secretion. It accumulates at the top of the ovum and when dried, it moves to the ovule of the gymnosperm for fertilization of the ovum.
18. ___ is the product of aerobic respiration.
[A] Malic acid
[B] Pyruvate
[C] Ethylene
[D] Lactose
Show Answer
Correct Answer: A [Malic acid]
Notes:
The citric acid cycle is involved in aerobic respiration. The end products of aerobic respiration are carbon dioxide and water. Aerobic respiration occurs in the mitochondria of the cell and produces many by-products.
19. Which of the following is a heterotrophic plant?
[A] Parasitic
[B] Insectivorous
[C] Symbiotic
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Heterotrophic plants which are mainly classified on the basis of their mode of nutrition are parasites, insect eaters, mortal, symbiotic.
20. Which of the following is not a part of the flower?
[A] Petals
[B] Sepals
[C] Pistil
[D] Pericarp
Show Answer
Correct Answer: D [Pericarp]
Notes:
The pericarp is a part of the fruit. Petals, Sepals, Pistil, and Stamen are parts of the flower.
