Class XI

Select the wrong statement
  1. Isogametes are similar in structure, function and behavior
  2. Anisogametes differ either in structure, function of behaviour
  3. In Oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile
  4. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy
The complex formed by a pair of synapsed homologous chromosomes is called :
  1. Equatorial plate
  2. Kinetochore
  3. Bivalent
  4. Axoneme
According to Darwin, the organic evolution is due to -
  1. Intraspecific competition
  2. Intraspecific competition
  3. Reduced feeding efficiency in one species due to the presence of interfering species.
  4. Competition within closely related species
In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called :
  1. selection of superior recombinants
  2. cross-hybridisation among the selected parents
  3. evaluation and selection of parents
  4. germplasm collection
Which of the following is a polar molecule ?
  1. BF3
  2. SF4
  3. SiF4
  4. XeF4
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