NTSE Level Test: How do Organisms Reproduce? - Class 10

Asexual reproduction is the mode of reproduction in single parent produces offsprings. Amoeba reproduces asexually by binary fission. Asexual reproduction occurs in yeast by means of budding and in banana asexual reproduction occur by means of vegetative propagation from the stem. Thus, the correct answer is option D.

Anther is the male reproductive part of a flower from which pollen grains when are released during maturation the transfer of pollen grains from anther to stigma take place. So, option C is correct that anther produces pollen grains.

First step is pollination then fertilisation resulting in formation of embryo which gives rise to a new plant.

Regeneration is one of the processes in which if an organism is cut into several pieces, each of its parts regrows to the original state. This process is carried out by specialized cells called stem cells. 

Individuals formed by asexual reproduction have the same genetic make up as that of parent.

In fission (or binary fission), a parent separates into two or more individuals of about equal size. This type of reproduction is common among single-celled organisms including bacteria, archaea, and unicellular eukaryotes, such as protists and some fungi. The single cell divides into two daughter cells.

Spirogyra produce asexually by fragmentation and sexually by conjugation. In fragmentation method, spirogyra breaks into two or more segments and each segment form new organism.

Option ( c) budding is correct because other options ( cutting, layering, graftin) are the artificial method of vegetative propagation.

During fertilisation gametes fuse to form zygote which later forms embryo which develops into seedling.

The Binary fission is a process through which a single cell in a bacteria or a fungi splits into 2 cells, one mother cell splits into 2 newly formed daughter cells, and this process is somewhat similar to the process of mitosis that takes place in the higher organisms. The other methods mostly take place during unfavourable conditions.