Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Biology Reproduction in Organisms
Fertilization occurs inside or out side the body of an organism. Name the types of fertilization. Which one is more advantageous ?
External and internal fertilization
Water hyacinth is also known as scourge of water bodies or 'terror of Bengal”.Justify.
It is an invasive weed which drains oxygen from the water which leads to the death of fishes and aquatic
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) Sponges: Gemmules- ------------
The size of the crows and parrots are not very different but their life span show a wide difference. Justify your answer
The life span of organisms are not necessarily correlated with their
Match the following organisms to their life spans
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:
Hermaphrodites are animals possess both male and female reproductive
a) Define reproduction? Mention its significance.
Reproduction is defined as a biological process in which an organism gives rise to young ones (offspring) similar to itself.
Reproduction enables the
Name the reproductive structure of the following organisms.
a) Penicillium b) Sponge c) Hydra d) Algae
Name two organisims exhibiting external fertilisation.
Write the disadvantage of external fertilization ?
Bony fishes, frogs/amphibians ,algae (any two)
The offsprings are extremely vulnerable to predators threatening their survival up to
The chances of survival of young one is greater in viviparous organism. Why?
In viviparous animals the zygote develops into a young one inside the body of the female organism. Because of proper embryonic care and protection, the chances of
Compare juvenile phase and vegetative phase in organisms.
All organisms have to reach a certain stage of growth and maturity in their life, before they can reproduce sexually. That period of growth is called the juvenile
Name the common motile asexual reproductive structure seen in Chlamydomonas.
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?
Females of primates exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase , called menstrual
List out any four changes that occur in a flower after fertilization.
Sepals,petals,and stamens wither and fall off.
Zygote develops into embryo.
Ovule develops into seed.
Ovary develops into
Observe the diagrams given below and identify the types of gametes.
a) Homogametes / Isogametes.
Water hyacinth vegetatively multiplies by offset ,while Agave multiplies by ………
What are hermaphrodites? Give two examples.
Hermaphrodites are animals that possess both male and female reproductive organs.
Eg. Earthworms, Sponge, Tape worm, Leech (Any
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
a) Male gamete: 17
b) Female gamete: 17
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.
b)Rotifers, Honey bees, Lizards,
Match the following items A with B
2.Bulbils b.Water hyacinth
3.Leaf bud c.Ginger