Question 2 :
Do genetic combination of mothers play a significant role in determining the sex of a new born?
Question 3 :
Study of the evolution of human beings indicates that all of us belong to a single species that evolved in Africa and spread across the world in stages.
Question 4 :
If the fossil of an organism is found in the deeper layers of Earth, then we can predict that .........
Question 5 :
A woman has only daughters. The reason behind this can be
(i) The woman produces ova with 'X' chromosome.
(ii) The man produces sperms with X and Y chromosomes which actually determines the sex of the baby.
Question 7 :
Those organs which have the same basic structure but different functions are called ?
Question 12 :
Mendel chose pea plant for his experiments because
(i) Easy to grow
(ii)Short life span
(iii)Easily distinguishible characters
(iv) Larger size of flower
(v) Self pollinated
Question 14 :
What are the different ways in which individuals with a particular trait may increase in a population?
Question 15 :
Why are traits acquired during the life-time of an individual not inherited?
Question 18 :
Give a characteristic to show that birds are closely related to dinosaurs.
Question 19 :
The number of successful variations are maximised by the process of ____________
Question 22 :
The more characteristics two species will have in common, the more closely they are related. And the more closely they are related, the more recently they will have had a common ancestor. TRUE or FALSE?
Question 24 :
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as
Question 25 :
In the following cross, rr yy x rr yy ,the characteristics of the progeny is
Question 26 :
Variation decreases the chances of survival of an organism in a changing environment. State whether this statement is True or False.
Question 27 :
'If sexual reproduction is involved, greater diversity will be generated'. State whether this statement is True or False.
Question 28 :
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Question 29 :
According to the evolutionary theory, formation of a new species is generally due to
Question 30 :
In the following cross, RR YY x rr yy, the characteristics of the progeny is
Question 31 :
Speciation may take place when variation is combined with geographical isolation.
Question 32 :
Does geographical isolation of individuals of a species lead to formation of a new species?
Question 35 :
The difference between genetic drift and change due to natural selection is ?
Question 36 :
How is the equal genetic contribution of male and female parents ensured in the
progeny?
Question 39 :
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
Question 40 :
Classification of species is in fact a reflection of their evolutionary relationship. State whether this statement is True or False.
Question 41 :
New species can be formed if:
i) DNA undergoes significant changes in germ cells.
ii) Chromosome number changes in the gamete.
iii) There is no change in the genetic material.
iv) Mating does not take place.
Question 42 :
Which concept was not included in Charles Darwin’s theory of Natural Selection?
Question 43 :
Crows cannot see green-coloured beetles on the green leaves of the bushes, and therefore cannot eat them. What happens then?
Question 44 :
Select the statement that describe characteristics of genes :
(i) Genes are specific sequence of bases in a DNA molecule
(ii) A gene does not code for proteins
(iii) In individuals of a given species, a specific gene is located on a particular chromosome
(iv) Each chromosome has only one gene
Question 46 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ce4273b230584979b62.PNG' />
In the above figure, what are the combinations of character in the $F_2$ progeny?
(i) Round and Green
(ii) Round and Yellow
(iii) Wrinkled and Green
(iv) Wrinkled and Yellow
Question 48 :
In a number of animals including human beings, which reproduce sexually, quite distinct variations are visible among different individuals. State whether this statement is True or False.
Question 50 :
A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?
