Friday, November 23, 2012

Reproduction in Plants and animals Solved Questions for class VII

What is meant by reproduction?

The process of producing new individuals of same kind of the same species is called reproduction.

Why reproduction is a essential life process?

Reproduction is essential for continuation of the species from generation to generation.

What are the different modes of unisexual reproduction?

The modes of reproduction evolve only one parent is called unisexual reproduction.

(a) Fission: The mode of reproduction in which unicellular organism split into two equal halves and produce new ones is called binary fission. For example amoeba and bacteria

(b) Fragmentation: The mode of reproduction in which body of plant breaks up into smaller fragments and each fragment grows into a new individual is known as Fragmentation e.g. Spirogyra , algae

(c) Budding: The mode of reproduction in which small buds when develop get separated and mature into new organisms is called Budding. E.g. Yeast, Hydra, Bryophyllum

(d) Spore formation: The mode of reproduction takes place by means of spores is called spore algae and fungi

The spores are covered by thick walls that protect them until they come into  contact with another moist surface and can begin to grow.

Mention some of the spores of asexual reproduction.

Aplanospores, Zoospores, Akinetes and Conidia

What do you mean by vegetative propagation?

Vegetative propagation is the ability of plants to reproduce by using vegetative parts like root ,stem and leaves is called vegetative propagation.

 Why there are so many methods of reproduction?

It is due to complexity of the body design of organisms.

What is sexual reproduction?

Sexual reproduction is the process in which two components ( male and female) are involved to produce offspring of their own kind.

Name the reproductive organ of a flowering plant

The flower is a reproductive organ of a flowering plant

Name the male and female part of flower.
Androecium is the male part of a flower,and Gynoecium is the female part.
                                              Androecium is a group of stamens. Each Stamen consists of a stalk called the filament and a small bag like structure called the anther at the tip. The pollen grains are contained in the anther within the pollen sacs
                                                                          Gynoceium is the female part of the flower and consists of the carpels or ovary. Gynoceium has three parts 1) Stigma 2) Style and 3) Ovary. The ovary contains the ovules and each ovule carries within it an embryo sac, within which lies the egg cell or the female gamete.

For further study visit post related to Reproduction in plants

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