Define chromosomes. How many chromosomes are present in a gamete?
Important Questions on Life Processes in Living Organisms Part - 2
There are _____ pairs of chromosomes in human beings. [Write the value in digits]
Write the changes that occur in the age group to years in boys.
There are two sets of chromosomes in zygote.
In the tobacco plant, the male gametes have 24 chromosomes.
What is the total number of chromosomes in the zygote? (48/ 23/ 46)
X and Y are two human beings. The organ A in the reproductive system of X releases a mature gamete B once a month which goes into a tube-like structure C through a funnel-like opening. The organ D in the reproductive system of Y makes and releases gametes E which pass through a duct F and are introduced by an organ of Y, into the body of X. B and E fuse together in C to form a new cell G. The cell G divides repeatedly to form a ball of cells H which gets embedded in the lining of the organ I of the reproductive system of X where it grows and develops into a baby.
Name the cell G.
Gametes fuse to form __________ which develops into a new individual?
When an insect sits on the flower of a plant, then some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of the flower. The particle A grows a long tube B from the top of the flask-shaped organ through which C moves down and reaches the bottom part of the flask-shaped organ. Here C fuses with the nucleus of D contained in structure E. The fusion of C and D forms a new cell F which grows and develops into a seed of the plant.
What is F?
What happens to the following parts after fertilisation?
(a) Ovum
(b) Ovary
(c) Ovule
(d) Sepals and Petals
