Science for class tenth - Subject-Biology solutions for Chapter 3 How do Organisms Reproduce?

Which life process ensures that a plant or animal species will not disappear from this earth?

State whether the following statement is true or false:

Spores produced by the bread mould plant are actually its seeds.

State whether human beings reproduce by sexual method or asexual method.

(a) Name two animals which reproduce sexually.

(b) Name two animals which reproduce asexually.

Name one organism which reproduces by spore formation.

Name the method by which Paramecium reproduces. Is this method sexual or asexual?

Name two plants :

(a) which can be grown from their broken stems.

(b) Which can be grown from their leaves.

Name the asexual method of reproduction in yeast.

Name the asexual method of reproduction in (a) Hydra, and (b) Plasmodium.

Name the artificial propagation method used for the propagation of (a) rose plants, and (b) apple trees.

Name any two plants which are propagated by cuttings method.

Write down the different methods of asexual reproduction.

(a) What is meant by regeneration? Name two animals which can regenerate fully from their cut body parts.

(b) Explain why more complex multicellular organisms cannot give rise to new organisms through regeneration.

(a) What is meant by the term 'artificial propagation of plants'?

(b) Name three common methods which are used for the artificial propagation of plants.

(c) Name two plants which are usually propagated by artificial propagation methods. Name the method of artificial propagation used in each case.

Describe the layering method for the artificial propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.

(a) What is meant by the term 'fission' as used in biology?

(b) How does binary fission differ from multiple fission?

(c) Name one organism which reproduces by binary fission and another which reproduces by multiple fission.

(d) State whether the above-named organisms are animals or plants

(a) Can you consider cell division as a type of reproduction in unicellular organisms? Give reason.

(b) What is a clone? Why do offsprings form by asexual reproduction exhibit remarkable similarity

(a) What is a tuber? Name one stem tuber and one root tuber.

(b) What is the name of the organ of propagation present in a tuber?

(c) Name one commonly used vegetable which is propagated by using tubers.

(a) What is meant by vegetative propagation?

(b) Vegetative propagation involves the growth and development of 'something' present in the old part of the plant to form a new plant. What is this 'something'?

(c) Why do green grass plants spring up in dry fields on their own after the rains?

(a) Explain how new Bryophyllum plants can be produced from the leaves of the old plant? Illustrate your answer with the help of a labelled diagram.

(b) How can you grow the money plant by vegetative propagation?

(a) What is meant by reproduction?

(b) What are the two general methods of reproduction in organisms?

(c) How does an Amoeba reproduce? Describe the process of reproduction in Amoeba with the help of labelled diagrams of different stages in its reproduction process.

(d) What is the name of the process by which Amoeba reproduces?

(e) Name two organisms which reproduce by the same asexual process as that of Amoeba

(a) What is tissue culture?

(b) Name any four types of ornamental plants which are being produced by tissue culture technique.

(c) What is the importance of DNA copying in reproduction? Explain with an example.

(d) How does reproduction help in providing stability to the population of species?

(e) Why is variation during reproduction beneficial to the species but not necessarily for the individual?

Asexual reproduction is :

(a) a fusion of specialized cells

(b) a method by which all types of organisms reproduce

(c) a method producing genetically identical offspring

(d) a method in which more than one parent is involved

One of the following organisms does not reproduce by binary fission. This is:

(a) Amoeba

(b) Plasmodium

(c) Leishmania

(d) Paramecium

The protozoan having a flagellum at its one end is:

(a) Amoeba

(b) Paramecium

(c) Hydra

(d) Leishmania

The unicellular organism which reproduces by budding is:

(a) Spirogyra

(b) Hydra

(c) Planaria

(d) Yeast

The offsprings formed by asexual reproduction method have greater similarity among themselves because :

(i) asexual reproduction involves only one parent

(ii) asexual reproduction involves two parents

(iii) asexual reproduction involves gametes

(iv) asexual reproduction does not involve gametes

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iv)

(d) (i) and (iv)

A simple multicellular animal having tentacles which live in freshwater usually reproduces by the asexual process of:

(a) binary fission

(b) spore formation

(c) budding

(d) fragmentation

One of the following does not reproduce by spore formation method. This is:

(a) Rhizopus fungus

(b) Penicillium fungus

(c) Yeast fungus

(d) Mucor fungus

The factors responsible for the rapid spreading of bread mould on slices of bread are:

(i) presence of a large number of spores in the air

(ii) presence of a large number of thread-like branched hyphae

(iii) presence of moisture and nutrients

(iv) formation of round shaped sporangia

(a) (i) and (iii)

(b) (ii) and (iv)

(c) (i) and (ii)

(d) (iii) and (iv)

One of the following reproduces by forming spores. This is:

(a) Fern

(b) Planaria

(c) Spirogyra

(d) Potato

One of the following organisms does not reproduce by fission. This is:

(a) Amoeba

(b) Leishmania

(c) Planaria

(d) Plasmodium

An animal which reproduces by the process of budding is:

(a) Plasmodium

(b) yeast

(c) Hydra

(d) Planaria

In Spirogyra, asexual reproduction takes place by:

(a) division of a cell into two cells

(b) breaking up of filaments into smaller bits

(c) division of a cell into many cells

(d) formation of a large number of buds

In Rhizopus fungus, the fine thread-like structures spread on the whole surface of slice of bread is called:

(a) rhizoids

(b) stems

(c) roots

(d) hyphae

Vegetative propagation refers to the formation of new plants from the following existing organs of the old plants :

(a) stems, roots and flowers

(b) stems, roots and leaves

(c) stems, flowers and fruits

(d) stems, leaves and flower

The two types of organisms which produce colonies by the process of budding are:

(a) Hydra and Corals

(b) Yeast and Sponges

(c) Corals and Sponges

(d) Hydra and Yeast

Spore formation is the most common asexual method of reproduction in:

(a) protozoa

(b) tubers

(c) fungi

(d) algae

An alga which reproduces by the asexual reproduction method called fragmentation is:

(a) Rhizopus

(b) Salmonella

(c) Plasmodium

(d) Spirogyra

Binary fission describes the type of reproduction where the organism divides to form :

(a) many spores

(b) two daughters

(c) many buds

(d) two hyphae

The cut part of a plant stem (without roots) which is used in grafting is called:

(a) stock

(b) stump

(c) scion

(d) graft

An organism having a whip-like structure at one end which reproduces by the process of binary fission is:

(a)Hydra

(b) Paramecium

(c) Leishmania

(d) Plasmodium

Stock and scion are involved in the artificial propagation method is known as:

(a) tissue culture

(b) layering

(c) grafting

(d) cuttings

(a) What is meant by 'grafting' as a means of propagation in plants?

(b) Define 'stock' and 'scion'.

(c) Describe the grafting method for the artificial propagation of plants with the help of labelled diagrams.

(d) Name two fruit trees which are usually propagated by grafting method.

(e) State two advantages of grafting method of artificial propagation of plants.

(f) What is the difference between the cuttings method and grafting method for the artificial propagation of plants?

Science for class tenth subject biology Solutions for Chapter 3 how do organisms reproduce