Tag: biology

Fertilization in humans is the fusion of female gamete and a male gamete in the ampulla of the oviduct. The result is the production of a zygote or fertilized egg.
Thus, the correct answer is option A.

Every month, the egg is released from the ovary and moves into the fallopian tube for fertilization and if the egg is not fertilized during that time, it disintegrates. The life span of that unfertilized egg is 24 hours or one day after it has left the ovary. So, the correct answer is option C.

The female mammals are characterized by cyclic changes in reproductive tract and ovaries, regulated by some hormones like FSH and LH. Every month, one ovarian follicle matures, ruptures and releases its ovum into the peritoneal cavity and this ovarian follicle is called as Graffian follicle. Therefore, the term Graffian follicle is used for a mature follicle in the mammalian ovary.

The egg released from the mature Graafian follicle enters the fallopian tube through the ostium. The egg waits in the ampulla region of the fallopian tube for the sperm. The process of fertilisation is te fusion of the male and the female gametes which take place in the fallopian tube.

• Fusion of male and female gamete is a key step in reproduction. This is known as fertilization.
• Fertilization results in zygote which later develops into embryo.

Fertilization is the process in which haploid male and haploid female gamete fuse together to form a diploid zygote. This process is also known as syngamy. In this process, the nucleus of the male gamete fuses with the nucleus of the female gamete to promote the fusion of their genetic material. So, the correct option is A.

Electromagnetic energy is the same as radiation or light energy. This type of kinetic energy can take the form of visible light waves, like the light from a candle or a light bulb, or invisible waves, like radio waves, microwaves, x-rays and gamma rays. Further, irrespective of where radiation is coming from, it can travel in a vacuum. The electromagnetic energy in plants can be converted to stored chemical energy during photosynthesis. 

Option 'A' is correct.

Chloroplasts are the cell organelles where photosynthesis occurs. The light reactions occur in thylakoid membranes and dark reactions occur in stroma of chloroplasts. These reactions result in synthesis of sugars (glucose) in chloroplasts.

The chloroplast is the cell organelles present in plant cells that are responsible for initiating the process of photosynthesis. Chloroplasts are double-membrane bound structures. The stroma of chloroplast is the jelly-fluid like structure in which another membrane system is presently called the thylakoids. These thylakoids are stacked upon each other to form the structure called grana. The grana are connected with each other by an extension of thylakoids called stroma lamellae. Thylakoid of grana has the photosynthetic pigments embedded in it that perform the trapping of sunlight and begin the light reaction of the photosynthesis.