Fill in the Blanks Science Class 10 Chapter 9: Heredity and Evolution

Read the following statements and fill in the blanks with appropriate words:

Question.1.
Broccoli has been developed from ________ cabbage through artificial selection.

Question.2.
__________ speciation occurs in geographically separated populations.

Allopatric

Question.3.
Fossils are written documents of __________.

Evolution

Question.4.
Earth came into existence probably __________ million years ago.

Question.5.
__________ and _____________ proved that life originated from inorganic molecules.

Stanley Miller and Harold Urey

Question.6.
There is no possibility of chemical evolution of life on earth today, because __________.

The atmosphere is oxidising

Question.7.
Mendel is known as the father of ___________.

genetics

Question.8.
An atmosphere rich in hydrogen is an ___________ atmosphere.

Reducing

Question.9.
The first organisms were ___________ and not autotrophs.

Heterotrophs

Question.10.
The study of fossils, a branch of biology called __________ was founded by Goerges Cuiver.

Paleontology

Question.11.
The age of fossil is usually determined by analysing the _________ present in the rock from which fossil is recovered.

Radioactive materials

Question.12.
Theory of natural selection was proposed by ___________.

Darwin

Question.13.
The theory of natural selection was given by __________.

Darwin

Question.14.
Wind of bat and wing of bird are the example of the __________ organs.

Analogous

Question.15.
The process by which new species develop from existing ones is called _________.

speciation

Question.16.
Forelimbs of frog and lizard are the example of the __________ organs.

Homologous

Question.17.
_________ are the chromosomes found in somatic cells.

autosomes

Question.18.
The analogous organs have similar functions but have __________ structures.

Different

Question.19.
The homologous organs have different functions but have __________ structures.

Similar

Question.20.
The sex chromosomes in male are indicated by ___________.

Question.21.
Tendril of a pea plant and phylloclade of Opuntia are ___________ structures.

analogous

Question.22.
Chromosome consists of a DNA molecule and ____________.

Protein

Question.23.
The sex chromosomes in female are indicated by _____________.

Question.24.
The phenotypic ratio between tall and dwarf is __________.

3 : 1

Question.25.
The phenotypic in dihybrid cross is ________.

9 : 3 : 3 : 1

Question.26.
There are __________ pairs of chromosomes in human.

Question.27.
The differences from one generation to the other generation are called __________.

Variations

Question.28.
The offspring can be of two types with XX and __________ chromosomes.

Question.29.
___________ reproduction causes greater diversity.

Sexual

Question.30.
Transmission of traits from one generation to the next generation is called ___________.

Heredity

Question.31.
The chromosome related to determination of sex is called __________.

Sex Chromosome

Question.32.
A test cross can distinguish the pure dominant from the __________ dominant.

Impure

Question.33.
Mendel performed his experiments on _____________.

Garden pea

Question.34.
According to modern concept, Mendel’s factor is called a ___________.

Question.35.
Characteristics that are developed during the lifetime of an individual are ___________.

acquired

Question.36.
Mendelian factors or genes as well as chromosomes are present in ____________.

Pairs

Question.37.
The traits which express themselves in F1 generation are called __________.

Dominant

Question.38.
The genetics is the science of _________ and __________.

Heredity, Variations

Question.39.
DNA segment in a chromosome performing specific function is the __________.

Question.40.
The traits which are acquired by an organism during its lifetime are called ___________.

Acquired traits

Question.41.
The two types of reproduction are sexual and ___________.

Asexual

Question.42.
_______________ traits are unable to express in a hybrid.

Recessive

Question.43.
Gene is the segment of __________.

Question.44.
Gene is the segment of __________.

Question.45.
Out of tall and dwarf plants _________ trait is dominant.

Question.46.
If tall plant contains TT gene then dwarf plant contains __________.

Question.47.
___________ called father of genetics.

Mendel

Question.48.
___________ called father of genetics.

Bateson

Question.49.
Mendel chose ___________ characters in Pea for his experiments.

Seven

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