Fertilization  occurs inside or out side the body of an organism. Name the types of fertilization. Which one is more advantageous  ?

Water hyacinth is also known as scourge of water bodies or 'terror of Bengal”.Justify.

Choose the correct answer .

The most common asexual microscopic motile structures seen in algae

 a) Conidia   b) Gemmule     c) Zoospores    d)Buds

Observe the figures given below,identify and name the organisms and their asexual reproductive structures

                        (a)

                             (b)

The size of the crows and parrots are not very different  but their life span show a wide difference. Justify your answer 

Match the following organisms to their life spans

        A                                                        B

i. Butterfly                                          140- years

ii. Crow                                               100-150 yers

iii. Parrot                                             1-2 weeks

iv. Tortoise                                           15 years

Observe the relationship of the first pair and fill the blank

Chara  :  Monoecious plant      :::   Marchantia.::............................................

Choose hermaphrodites from the list given below:

Sponges,Cockroach,Leech,Lizard, Earthworm.

Define hermaphrodites.

a) Define reproduction? Mention its significance.

Name two organisims exhibiting external fertilisation.

Write the disadvantage of external fertilization ?

The chances of survival of young one is greater in viviparous organism. Why?

Compare juvenile phase and vegetative phase in organisms.

Penicillium  reproduce asexually by conidia whereas sponges by ...............................

Fill in the blanks

Water hyacinth vegetatively propagates by Offset ,but Agave vegetatively propagates by ......................................................

Name the most common asexual microscopic motile structures seen in algae.

S       Select the correct answer.

The most common asexual microscopic motile structures seen in algae.

a) Conidia b) Gemmule c) Zoospores d) Buds

Define menstrual cycle. What is the term given to this kind of changes that takes place in non-primates?

List out any four changes that occur in a flower after fertilization.

Water hyacinth vegetatively multiplies by offset ,while Agave multiplies by ………

What  are hermaphrodites?  Give two examples.

In Apple tree the chromosome number of meiocyte is 34 .Give the number of chromosome in the following cells of apple tree .

  a) Male gamete   b) Female gamete   c) Zygote d)Embryo cells    

Offsprings of oviparous animals  are at a greater risk as compared to offsprings of viviparous animals. Substantiate your answer.

Observe the diagram .

a) Identify the type of asexual reproduction shown in this diagram.

b) Name two organisms whiich reproduce by this method.

Asexual and sexual reproduction  are two types of reproduction in organisms.

Which one is more better? Why?

In some organisms the female gamete develops to form new organisms without fertilization.

a)Name this phenomenon.

b) Give two examples.

Match the following items A with B

    A                                                         B

1.Rhizome                                      a.Agave

2.Bulbils                                          b.Water hyacinth

3.Leaf bud                                       c.Ginger

4.Offset                                            d.Bryophyllum