Advertisements
Advertisements
प्रश्न
Which of the following statement is incorrect with respect to variations?
(a) all variations in a species have equal chance of survival
(b) change in genetic composition results in variations
(c) selection of variations by environmental factors forms the basis of evolutionary process
(d) variations are the minimum in asexual reproduction
उत्तर
all variations in a species have an equal chance of survival
All variations in a species do not have an equal chance of survival. Variations may either be beneficial or harmful to the species.
APPEARS IN
संबंधित प्रश्न
Struggle between cow and cow to get grass is called ______.
Name one reptile in given case where higher incubation temperature leads to the development of female progeny.
The palisade cells of a species of plant contain 28 chromosomes. How many chromosomes will there be in each gamete produced by the plant?
(a) 56
(b) 28
(c) 14
(d) 4
A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offsprings have red petals?
(a) Which gene is dominant?
(b) Choose suitable letters to represent the two genes.
What name is given to the sequence of gradual changes over millions of years in which new species are produced?
Name the famous book written by Charles Robert Darwin.
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to same species?
List any two factors that could lead to speciation.
In human males, all the chromosomes are paired perfectly except one. These unpaired chromosomes are ______
(i) Large chromosome
(ii) Small chromosome
(iii) Y chromosome
(iv) X chromosome
Complete the following chart:
Animals | Connecting link between | |
(1) | Balanoglossus | ______ |
(2) | ______ | Annelida and Arthropoda |
(3) | Lung fishes | ______ |
(4) | ______ | Reptiles and mammals |
(5) | Seymouria | ______ |
(6) | Fishes and Amphibia |