CHAPTER 12 : THE LIFE CYCLE

Q.I [A] Fill in the blanks : 2 

1. The functional unit in a plant’s sexual reproduction is ...................... . 

2. The male reproductive part of a flower is ...................... . 

3. Hydra uses regenerative cells for reproduction in the process of ....................... . 

4. A basic process in reproduction is the creation of a ...................... copy. 

Q.I [B] Write the correlated terms : 2 

1. Amoeba : Simple binary fission :: Paramoecium : ...................... . 

2. Planaria : Regeneration :: Rhizopus : ...................... . 

3. Root, Stem, Leaf : Vegetative propagation :: Flower : ...................... . 

4. Asexual reproduction : Similarity :: Sexual reproduction : ...................... . 

Q.I [C] Define the following : 3 

1. Reproduction. 

2. Vegetative propagation. 

3. Meiosis. 

Q.II Draw a neat and labelled diagram : (Any Two) 4 

1. Longitudinal section of flower. 

2. Binary fission in amoeba. 

3. Spore formation in Mucor. 

4. Human female reproductive system. 

Q.III Answer the following questions : (Any Two) 4 

1. Why does menstruation occur ? 

2. Explain disadvantages of large family size. 

3. Write a note on Regeneration. 

4. Explain the importance of variation. 

Q.IV Answer the following : (Any One) 5 

1. Describe the human male reproductive system. 

2. Describe the modes of reproduction in unicellular organisms.

THE LIFE CYCLE

Objectives

Write the correlated terms


Explain the following terms.

Reproduction, 

Vegetative Propagation, 

Pollination

Meiosis.


Write the functions of the following organs in reproduction. Vagina, Stigma, Ovaries, Seminal vesicle and Prostate glands, uterus


Diagram

Longitudinal section of flower.

Binary fission in amoeba.

Spore formation in Mucor.

Human female reproductive system.


Answer the following.

What are the advantages of sexual reproduction over asexual reproduction?

Describe sexual reproduction in plants.

Describe the modes of reproduction in unicellular organisms.

Explain the disadvantages of large family size.


Write short notes on

Binary fission

Budding.

Pollination

Regeneration

Germination of seeds

Multiple fission

Importance of variation


Give Scientific Reason.