Question 1 :
'If sexual reproduction is involved, greater diversity will be generated'. State whether this statement is True or False.
Question 2 :
The number of pair(s) of sex chromosomes in the zygote of humans is
Question 8 :
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 10 :
What does the progeny of a tall plant with round seeds and a short plant with wrinkled seeds look like?
Question 11 :
If a round, green seeded pea plant (RR yy) is crossed with wrinkled yellow seeded pea plant, (rr YY) the seeds produced in $F_1$ generation are
Question 12 :
In the following cross, RR YY x RR YY ,the characteristics of the progeny is
Question 13 :
A cross between two individuals results in a ratio of 9 : 3 : 3 :1 for four possible phenotypes of progeny. This is an example of a ?
Question 15 :
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 16 :
In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in $F_2$ is
Question 18 :
Which of the following statements is not true with respect to variation?
Question 19 :
The number of successful variations are maximised by the process of ____________
Question 21 :
The process where characteristics are transmitted from parent to offsprings is called:
Question 22 :
The sequence of gradual changes which takes place in the primitive organisms over millions of years in which new species are produced is known as ?
Question 23 :
If the fossil of an organism is found in the deeper layers of Earth, then we can predict that .........
Question 24 :
<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 26 :
A very small population of a species faces a greater threat of extinction than a larger population. Is this statement TRUE or FALSE?
Question 27 :
How are the areas of study – evolution and classification – interlinked?
Question 28 :
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that :
Question 29 :
The important feature(s) of fossils which help in the study of evolution is/are
(i)Fossils represent modes of preservation of ancient species
(ii)Fossils help in establishing evolutionary traits among organisms and their ancestors
(iii)Fossils help in establishing the time period in which organisms lived
Question 31 :
Does geographical isolation of individuals of a species lead to formation of a new species?
Question 33 :
In the following cross, RR YY x rr yy, the characteristics of the progeny is
Question 34 :
Acquired characters are not inherited because they do not produce change in the DNA of germ cells. Is this statement TRUE or FALSE?
Question 35 :
Those organs which have different basic structure but have similar appearance and perform similar functions are called ?
Question 36 :
Choose the odd one out – Green pod, Yellow seed, Purple flower, Terminal flower.
Question 39 :
From the list given below, select the character which can be acquired but not inherited
Question 40 :
The process by which new species develop from the existing species is known as _____.
Question 41 :
The contrasting trait of seeds of a pea plant that is dominant is
Question 43 :
A zygote which has an X-chromosome inherited from the father will develop into a
Question 45 :
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
Question 46 :
Is it necessary that homologous structures always have a common ancestor?
Question 49 :
The process of evolution of a species whereby characteristics which help individual organisms to survive and reproduce are passed on to their offspring and those characteristics which do not help are not passed on is called