Question Bank Directory

Which one of the following is a xerophytic plant in which the stem is modified into a flat green and succulent structure:

Reason for trisomy in Down's syndrome is:

Flippers of Penguins and Dolphins are examples of

Double fertilization is:

Match List-I with List-II: List-I (Types of inheritance) A. Incomplete dominance B. Co-dominance C. Pleiotropy D. Polygenic inheritance List-II (Example) I. Blood groups in human II. Flower colour in Antirrhinum III. Skin colour in human IV. Phenylketonuria

The production of gametes by the parents, formation of zygotes, the $F_1$ and $F_2$ plants, can be understood from a diagram called :

According to Mendelism which character is showing dominance:

Which one from those given below is the period for Mendel's hybridization experiments?

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:

Pollen grains can be stored for several years in liquid nitrogen having a temperature of:

Two genes R and Y are located very close on the chromosomal linkage map of the maize plant. When RRYY and rryy genotypes are hybridized, then F2 segregation will show:

Diadelphous is found in

Mongolian idiocy (an obsolete term) is due to trisomy in the 21st chromosome. This condition is called:

How many true-breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

Which of the following has proved helpful in preserving pollens as fossils?

Winged pollen grains are present in:

Roots play an insignificant role in the absorption of water in:

Among the following characters, which one was not considered by Mendel in his experiments on pea?

In general, the egg apparatus of the embryo sac in angiosperms consists of:

Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?