MEDIUM
12th CBSE
IMPORTANT
Earn 100
Draw the sketches of a zoospore and a conidium. Mention two dissimilarities between them and at least one feature common to both structures.
Important Questions on Reproduction in Organisms
MEDIUM
12th CBSE
IMPORTANT
The term 'clone' cannot be applied to offspring formed by sexual reproduction because
MEDIUM
12th CBSE
IMPORTANT
A few statements with regard to sexual reproduction are given below. Choose the correct statements from the given options.
i. Sexual reproduction does not always require two individuals.
ii. Sexual reproduction generally involves gametic fusion.
iii. Meiosis never occurs during sexual reproduction.
iv. External fertilization is a rule during sexual reproduction.
MEDIUM
12th CBSE
IMPORTANT
A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has
HARD
12th CBSE
IMPORTANT
The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively
HARD
12th CBSE
IMPORTANT
Given below are a few statements related to external fertilisation. Choose the correct statements.
i. The male and female gametes are formed and released simultaneously.
ii. Only a few gametes are released into the medium.
iii. Water is the medium in a majority of organisms exhibiting external fertilisation.
iv. Offspring formed as a result of external fertilisation have a better chance of survival than those formed inside an organism.
MEDIUM
12th CBSE
IMPORTANT
Enumerate the differences between asexual and sexual reproduction. Describe the types of asexual reproduction exhibited by unicellular organisms.
MEDIUM
12th CBSE
IMPORTANT
Differentiate between oestrus and menstrual cycles. Cite an example for each type.
MEDIUM
12th CBSE
IMPORTANT
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other hand, a tomato plant produces plenty of fruits though they have small flowers. Analyse the reasons for the failure of fruit formation in rose.
