11. Which of the following plants is biennial? (UPSC Prelims 1989)
[A] Banana
[B] Pineapple
[C] Jack fruit
[D] Carrot
Show Answer
Correct Answer: D [Carrot]
Notes:
The Carrot plant is biennial and develops, in its second year.
12. Match List I with List II and select the correct answer using the codes given below the Lists:
Codes: (UPSC Prelims 2001)
[A] I-D, II-A, III-C, IV-B
[B] I-A, II-D, III-C, IV-B
[C] I-A, II-D, III-B, IV-C
[D] I-D, II-A, III-B, IV-C
Show Answer
Correct Answer: D [I-D, II-A, III-B, IV-C]
Notes:
The clavicle or collarbone is a long bone that serves as a strut between the shoulder blade and the sternum or breastbone. There are two clavicles, one on the left and one on the right. The clavicle is the only long bone in the body that lies horizontally.
The patella, also known as the kneecap, is a flat, circular-triangular bone which articulates with the femur (thigh bone) and covers and protects the anterior articular surface of the knee joint.
The scapula, or shoulder blade, is a large triangular-shaped bone that lies in the upper back.
The sternum or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major blood vessels from injury.
13. Who is the father of Modern Embryology?
[A] Antonie Van Leeuwenhoek
[B] Stephen Hales
[C] Karl Ernst von Bayer
[D] Georges Cuvier
Show Answer
Correct Answer: C [Karl Ernst von Bayer]
Notes:
Karl Ernst von Bayer was a Prussian-Estonian embryologist who discovered the mammalian ovum and notochord and founded the new science of comparative embryology with comparative anatomy.
14. Which of the following is a morphological feature of paramyxovirus?
[A] Fragile viruses often visualised with RNA spewing from the inside
[B] Elongate viruses
[C] Icosahedral viruses with envelope
[D] Very large viruses
Show Answer
Correct Answer: A [Fragile viruses often visualised with RNA spewing from the inside]
Notes:
Paramyxovirus are a family of single-stranded RNA viruses that cause a variety of infections in vertebrates. Many important human diseases are caused by paramyxoviruses.
15. How do pteridophytes differ from mosses?
[A] Independent gametophyte
[B] Dependent gametophyte
[C] Flagellate antherozoids
[D] Independent and dominant sporophyte
Show Answer
Correct Answer: D [Independent and dominant sporophyte]
Notes:
Pteridophytes differ from moss and seed plants in that both the generations are independent and dominant.
16. Which of the following is not an auxiliary pigment?
[A] Chlorophyll ‘a’
[B] Chlorophyll ‘e’
[C] Phycocyanin
[D] Xanthophyll
Show Answer
Correct Answer: A [Chlorophyll ‘a’]
Notes:
Chlorophyll ‘a’ is an essential pigment, it is not helpful.
17. A typical gymnospermous plant has 8 chromosomes in leaf cells. What will be the number of chromosomes in the cells of its gametophyte?
[A] 16
[B] 8
[C] 4
[D] 24
Show Answer
Correct Answer: C [4]
Notes:
The gametophytic phase involves the production of male and female gametophytes which are haploid cells. Thus, if the gymnosperm plant has 8 chromosomes then the gametophyte will have 4 chromosomes.
18. Which is used as Weedicide?
[A] Indole-3-butyric acid
[B] 2,4-dichlorophenoxyacetic acid
[C] Indole-3-Acetic Acid
[D] None of these
Show Answer
Correct Answer: B [2,4-dichlorophenoxyacetic acid]
Notes:
2,4-dichlorophenoxyacetic acid is used as Weedicide. It is this auxin that is produced synthetically. It mostly affects the foliage of the plant and is widely used in the treatment of weeds.
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. In which part of the plant does photosynthesis usually takes place?
[A] Flowers
[B] Roots
[C] Leaves
[D] Stems
Show Answer
Correct Answer: C [Leaves]
Notes:
Leaves are the part of the plant where photosynthesis takes place, in which food is made for the plant.
