Question 2 :
Those organs which have the same basic structure but different functions are called ?
Question 4 :
If a round, green seeded pea-plant (RRyy) is crossed with a wrinkled yellow seeded pea- plant (rrYY), the seeds produced in F1 generation are ?
Question 7 :
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 8 :
The theory of evolution of species by natural selection was given by
Question 11 :
Human beings and chimpanzees had ………….. ancestor a long time ago.
Question 12 :
The number of pair(s) of sex chromosomes in the zygote of humans is
Question 15 :
Give a characteristic to show that birds are closely related to dinosaurs.
Question 16 :
Fossils are the preserved remains or impressions of living organisms (plants and animals) that lived in the past. State whether this statement is True or False.
Question 19 :
If a trait 'A' exists in 10% of the population ofan asexually reproducing species and a trait 'B' exists in 60% of the same population, which trait is likely to have arisen earlier?
Question 20 :
Which concept was not included in Charles Darwin’s theory of Natural Selection?
Question 21 :
What are the different ways in which individuals with a particular trait may increase in a population?
Question 22 :
The process by which new species develop from the existing species is known as _____.
Question 23 :
'If one bacterium divides, and then the resultant two bacteria divide again, the four individual bacteria generated would be very similar'. State whether this statement is True or False.
Question 24 :
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 27 :
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 28 :
Do genetic combination of mothers play a significant role in determining the sex of a new born?
Question 31 :
The difference between genetic drift and change due to natural selection is ?
Question 32 :
The modern day Human species has evolved from its earliest ancestors who lived in ?
Question 33 :
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 34 :
What factors could lead to the rise of a new species?
Question 35 :
If the tail of the mice is removed by surgery in each generation, do these tailless mice have tailless progeny?
Question 36 :
The process where characteristics are transmitted from parent to offsprings is called:
Question 38 :
In the following cross, RR YY x RR YY ,the characteristics of the progeny is
Question 40 :
What factors could lead to the rise of a new species?
Question 41 :
Acquired characters are not inherited because they do not produce change in the DNA of germ cells. Is this statement TRUE or FALSE?
Question 43 :
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce $F_1$ progeny that have round, yellow (RrYy) seeds. When $F_1$ plants are selfed, the $F_2$ progeny will have new combination of characters. Choose the new combination from the following :
(i) Round, Yellow
(ii) Round, Green
(iii) Wrinkled, Yellow
(iv) Wrinkled, Green
Question 44 :
'If sexual reproduction is involved, greater diversity will be generated'. State whether this statement is True or False.
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 :
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 48 :
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 49 :
Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria?
Question 50 :
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.
