Biology 2011

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Q. 11. A collection of plants and seeds having diverse alleles of all the genes of a crop is called  

  1. Genome
  2. Herbarium
  3. Germplasm
  4. Gene library

Sol:

Germplasm can be selected as seed or plantlets for their superior traits.

Answer: (3)

 

Q. 12.  Which one of the following also acts as a catalyst in a bacterial cell?

  1. 23 sr RNA
  2. 5 sr RNA
  3. sn RNA  
  4. hn RNA

Sol:

23 S rRNA is catalytic RNA.

Answer: (1)

 

Q. 13. Which one of the following statements is correct?

  1. Flower of tulip is a modified shoot
  2. In tomato, fruit is a capsule
  3. Seeds of orchids have oil-rich endosperms
  4. Placentation in primose is basal

Sol:

Tomato — Berry, Orchid seed — no endosperm formation, Primrose — Free central placentation.

Answer: (1)

 

Q. 14. The correct floral formula of chilli is

Sol:

Chilli belongs to Solanaceae.

Answer: (3)

 

Q. 15. Nitrifying bacteria

  1. Reduce nitrates to free nitrogen
  2. Oxidize ammonia to nitrates
  3. Convert free nitrogen to nitrogen compounds
  4. Convert proteins into ammonia

Sol:

Step (1) — Nitrification by Nitrosomonas

Step (2) — Nitratification by Nitrocystis

Answer: (2)

 

Q. 16. The function of leghaemoglobin in the root nodules of legumes is  

  1. Expression of nif gene
  2. Inhibition of nitrogenase activity
  3. Oxygen removal   
  4. Nodule differentiation

Sol:

LHB is O2 scavanger.

Answer: (3)

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