11. Which of the following gave green colour to plants? (UPSC Prelims 1980).
[A] Chlorophyll
[B] Sugar
[C] Mitochondria
[D] Xylem
Show Answer
Correct Answer: A [Chlorophyll]
Notes:
Chlorophyll is the primary pigment in plants. It absorbs yellow and blue wavelengths of light while reflecting green. It is the presence and relative abundance of chlorophyll that gives plants their green color.
12. Which of the following vitamins was discovered by Sir Edward Mellanby?
[A] Vitamin C
[B] Vitamin D
[C] Vitamin K
[D] Vitamin E
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Vitamin D was discovered by Sir Edward Mellanby.
13. Which is the largest phylum of Animalia?
[A] Arthropoda
[B] Annelida
[C] Moluska
[D] Aves
Show Answer
Correct Answer: A [Arthropoda]
Notes:
Arthropoda is the largest phylum of animals. In Arthropoda we study in detail about insects.
14. Which of the following is milk sugar?
[A] Glucose
[B] Maltose
[C] Fructose
[D] Lactose
Show Answer
Correct Answer: D [Lactose]
Notes:
Lactose is known as milk sugar, and it is found in the milk of many mammals including humans and cows. Lactose is a disaccharide consisting of one unit of galactose and one unit of glucose.
15. Which is not an exception in angiosperms?
[A] Double fertilization
[B] Secondary growth
[C] Presence of vessels
[D] Autotrophic nutrition
Show Answer
Correct Answer: A [Double fertilization]
Notes:
Angiosperms are plants that produce flowers. They hold their seeds in the fruits. They are the largest and most diverse group within the Plantae kingdom, with approximately 300,000 species. Double fertilization is a characteristic of angiosperms in which both a diploid zygote and a triploid endosperm are formed in this process of green fertilization.
16. In aerobic respiration, glucose is broken down into what?
[A] carbon dioxide
[B] water
[C] ethyl alcohol
[D] Only 1 and 2
Show Answer
Correct Answer: D [Only 1 and 2]
Notes:
Glucose breaks down into carbon dioxide and water.
Glucose + Oxygen → Carbon dioxide + Water + Energy
17. When did the effect of cytokinin first appear?
[A] adding the liquid endosperm of papaya
[B] adding the liquid endosperm of coconuts
[C] adding the liquid endosperm of mango
[D] adding the liquid endosperm of grapes
Show Answer
Correct Answer: B [adding the liquid endosperm of coconuts]
Notes:
The effect of cytokinin was first observed when the addition of liquid endosperm of coconut to developing plant embryos in culture promoted their growth.
18. Name a disease of plant in which dark to light brown rot forms around wounded plant tissue?
[A] Gray Mold
[B] Citrus Canker
[C] Spider Mites
[D] None of the above
Show Answer
Correct Answer: A [Gray Mold]
Notes:
Gray mold is a plant disease in which dark to light brown rots from around injured plant tissue. Gray mold is caused by the fungus Botrytis cinerea.
19. What causes wheat tundu disease?
[A] Pythium debaryanum
[B] Albygo candida
[C] Clavibacter tritici
[D] Puccinia striiformis
Show Answer
Correct Answer: C [Clavibacter tritici]
Notes:
Tundu disease of wheat is caused by infection with a bacterial pathogen called Clavibacter tritici.
20. Comb jellies, sea gooseberries, sea walnuts are examples of__.
[A] Cnidaria
[B] Aschelminthes
[C] Porifera
[D] Ctenophores
Show Answer
Correct Answer: D [Ctenophores]
Notes:
Comb jellies, sea gooseberries, sea walnuts are examples of Ctenophores. Ctenophora includes a group of marine invertebrates.
