11. Why man cannot digest cellulose whereas cows can do so?
[A] Their gut contains certain bacteria capable of digesting cellulose
[B] They have a many-chambered stomach
[C] They have efficient grinding molars
[D] They produce enzyme cellulose which can digest cellulose
Show Answer
Correct Answer: A [Their gut contains certain bacteria capable of digesting cellulose]
Notes:
Unlike cows for example don’t have the necessary bacteria in their intestines that make the enzymes necessary to breakdown the 1-4 beta glucose bonds. So we cannot break down cellulose into its constituent glucose molecules as we do with starch.
12. Which among the following is the method of growing plants in the absence of soil?
[A] Hydrology
[B] Hydrotectonics
[C] Hydroponics
[D] Hydrochronology
Show Answer
Correct Answer: C [Hydroponics]
Notes:
The method of growing plants in the absence of soil is called as hydroponics. The required suppliments to the plants are supplied through the mineral nutrient solutions.
13. In which group maximum nutritional diversity is found?
[A] Monera
[B] Plantae
[C] Fungi
[D] Animalia
Show Answer
Correct Answer: A [Monera]
Notes:
The state of Monera has the highest nutritional diversity. Photoautotrophic, chemoautotrophic and heterotrophic have all possible types of nutrition
14. Which of the following biomolecules is more widely distributed in the cell?
[A] Chloroplast
[B] RNA
[C] DNA
[D] Spaherosomes
Show Answer
Correct Answer: B [RNA]
Notes:
DNA and RNA are two types of nucleic acids. DNA is converted into RNA by the process of transcription. The three types of RNA are m-RNA, t-RNA and r-RNA.
15. The cell wall of Spirogyra contains__?
[A] Cellulose
[B] Chitin
[C] Lignin
[D] Suberin
Show Answer
Correct Answer: B [Chitin]
Notes:
Chitin is used to build the cell wall. Each cell of Spirogyra is surrounded by a two-layered cell wall.
16. Pyrenoids are the center of the formation of__?
[A] Enzymes
[B] Proteins
[C] Fats
[D] Starch
Show Answer
Correct Answer: D [Starch]
Notes:
Pyrenoids are the center of the formation of Starch. Pyrenoids are non-membrane-bound organelles found in the chloroplasts of algae and hornwort plants. It can be seen by light-microscopy.
17. In Bryophyta, the adult plant body is__?
[A] Sporophyte
[B] Epiphyte
[C] Sporophyll
[D] Gametophyte
Show Answer
Correct Answer: D [Gametophyte]
Notes:
A gametophyte is one of two alternative multicellular stages in the life cycle of plants and algae.
18. Megasporangium in Gymnosperms is also called as__?
[A] Macrosporangiate
[B] Nucellus
[C] Microsporangium
[D] Male strobili
Show Answer
Correct Answer: B [Nucellus]
Notes:
Megasporangium in Gymnosperms is also called Nucellus. Megasporangium is the structure in certain spore-bearing plants in which the megaspores are formed.
19. ___ 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.
20. The bunchy top disease of the banana plants is caused by which of the following?
[A] Bacteria
[B] Fungus
[C] Virus
[D] None of the above
Show Answer
Correct Answer: C [Virus]
Notes:
The bunchy top disease of the banana plants is caused by viruses. In this disease, the plant becomes dwarf and all the leaves are deposited.
