11. When compared to the mammals, birds are less sensitive to temporary deprivation of water, because?
[A] The water requirement per unit weight is less in birds than in mammals.
[B] Absorption of water from the gut is more efficient in birds than in mammals.
[C] Urea excretion in mammals entails a greater loss of water than that in birds.
[D] None of these
Show Answer
Correct Answer: A [The water requirement per unit weight is less in birds than in mammals.]
Notes:
When compared to the mammals, birds are less sensitive to temporary deprivation of water, because the water requirement per unit weight is less in birds than in mammals.
12. Which of the following statements about the cell wall is false?
[A] cell wall is mainly composed of lipid
[B] cell wall is mainly composed of starch
[C] cell wall is mainly composed of protein
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
The cell wall is a structural layer surrounding cells, just outside the cell membrane. It can be hard, flexible and rigid.
13. Which disinfectant is effective against viruses?
[A] Hydrogen peroxide
[B] Hypochlorite
[C] Formaldehyde
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Hydrogen peroxide, Hypochlorite and Formaldehyde are disinfectants is effective against viruses.
14. What is the botanical name of sea palm?
[A] Polysiphonia
[B] Postelsia
[C] Ectocarpus
[D] Macrocystis
Show Answer
Correct Answer: B [Postelsia]
Notes:
Postelsia piriformis is also known as sea palm or palm seaweed. It is a genus of kelp and is classified within the brown algae.
15. 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.
16. Dicotyledonous branches are found in which of the following?
[A] Fern
[B] Funaria
[C] Liverworts
[D] Marchantia
Show Answer
Correct Answer: C [Liverworts]
Notes:
Dicotyledonous branches are found in Liverworts. Liverworts are also moss-like land plants that do not have a vascular system.
17. Fruitless flowering plants are called__?
[A] Sterile plants
[B] Angiosperms
[C] Primitive
[D] Gymnosperms
Show Answer
Correct Answer: D [Gymnosperms]
Notes:
Fruitless flowering plants are called Gymnosperms. They do not produce flowers. Seeds are not formed inside a fruit.
18. What is the arrangement of megaspores in tetrads in gymnosperms?
[A] Decussate
[B] Tetrahedral
[C] Linear
[D] Isobilateral
Show Answer
Correct Answer: C [Linear]
Notes:
These are formed from the mother cells inside the anther. Thus, the tetrad of the megaspore is usually linear.
19. The male reproductive part of a flower, the stamens, is collectively known as __?
[A] Androecium
[B] Filament
[C] Anther
[D] Gynoecium
Show Answer
Correct Answer: A [Androecium]
Notes:
The male reproductive part of a flower, the stamens, is collectively known as Androecium.
20. The part of the fruit formed from the wall of the ripe ovary is called__.
[A] Protoplasm
[B] Pericarp
[C] Ectoderm
[D] Perisperm
Show Answer
Correct Answer: B [Pericarp]
Notes:
The part of the fruit formed from the wall of the ripe ovary is called Pericarp.
