21.
The location of various genes on a chromosome relative to specific microscopically visible landmark on the chromosome is called

22.
In gametophytic system of self-incompatibility, fully compatible will result from a cross between

23.
Consider the following statements
In pedigree method of breeding
1. plant selection is continued till the progenies become homozygous.
2. plants are selected from F2 on words and their progenies are tested.
3. it may be possible to study precise nature of inheritance of different characters by studying the pedigree records.
Which of the statements given above are correct?

24.
Who discovered the cell?

25.
Resistance exhibited by adult plants is referred to as

26.
Designated inseparable seeds for wheat is

27.
DNA can be formed by

28.
Leafy vegetables like palak, amaranth us, spinach, are

29.
In wheat, an interspecific cross between Triticum aestivum and T. durum is

30.
Consider the following events which are significant in the development of improved varieties/hybrids of plants
1. Morgan discovered genes on chromosomes.
2. Knight noted that male and female parents contributed equally to F1-generation.
3. Correns and de Vries rediscovered Mendel's laws of heredity.
4. Tomato carrying flavour gene is introduced.
What is the correct chronological sequence of the above events?