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• Biology

Biology 2011

  

Q. 29. Filiform apparatus is a characteristic feature of

1. Zygote
2. Suspensor
3. Egg
4. Synergid

Sol:

These are fingure like projections at micropylar end of synergids.

Answer: (4)

 

Q .30. What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?

1. 21
2. 42
3. 63
4. 84

Sol:

Aleurone is triploid and root tip is diploid.

Answer: (3)

 

Q .31. Wind pollination is common in  

1. Orchids
2. Legumes
3. Lilies
4. Grasses

Sol:

Wind pollination is common in grasses and gymnosperms.

Answer: (4)

 

Q .32.   In which one of the following pollination is autogamous?

1. Cleistogamy  
2. Geitonogamy
3. Xenogamy
4. Chasmogamy

Sol:

Self pollination is favoured by cleistogamy.

Answer: (1)

 

Q .33. Mass of living matter at a trophic level in an area at any time is called

1. Standing state  
2. Standing crop
3. Detritus
4. Humus

Sol:

Standing state represent all non-living matter in an area at a given time.

Answer: (2)