Question

Q1.(A)Choose the correct option and rewrite the complete statement. [5]

1. Carbon dating method is developed by .

(a) Johann Gregor Mendel (b) Dr. Har Govind Khurana

(c) Ostwald Avery (d) Williard Libby

2. The theory of natural selection was proposed by .

(a) Mendel (b) Lamarck (c) Charles Darwin (d) Hugo de Vries

3. is pioneer of the modern genetics.

(a) Johann Gregor Mendel (b) Hugo de Vries

(c) Robert Hooke (d) Francis Jacob

4. Evolution means .

(a) slow (b) fast

(c) gradual development (d) sudden developement

5. The proof for the fact that protein synthesis occurs through was given by George

Beadle and Edward Tatum.

(a) mitochondria (b) nucleus (c) gene (d) amino acids

Q1. (B) Find the oddman out. [2]

1. Appendix, muscles of ear pinna, wisdom teeth, long neck of giraffe.

2. Cocyx, intestine, wisdom teeth, appendix.

Q1. (C)State whether the following statements True or False. Correct the false statements. [3]

1. Mutation may cause the genetic disorders like sickle cell anemia.

2. First living material has been formed in the ocean.

3. Geographical or reproductive isolation leads to speciation.

Q2. (A) Give reason(Any 2) [4]

1. Human evolution began approximately 7 crore years ago.

2. Geographical and reproductive isolation leads to speciation.

3. Why are many species of animals and birds getting extinct?

please solve all the sum



it's arguent
​

Answer 1

Q1 A-(d)
2.-(c)
3.-(a)
4.-(c)
5.-(c)
Q1.-B-long neck of giraffe
2.intestine
Q1.C-true
2.true
3.true
Q2. Human evolution took place in time period of about 7 crore years. According to this concept the journey of human evolution is as follows:
(1) Approximately around 7 crore years back the ice age began on the earth. In such conditions, dinosaurs became extinct. The evolution and diversity of mammals started during this time. Due to change in climate the forest cover also declined rapidly.
(2) Ancestors of monkey-like animals were Lemur like animals which evolved during this time period.
(3) The tails of these monkey-like creatures started vanishing very gradually around 4 crore years ago.
(4) The body and brain both increased in volume forming first ape like animals. The monkey like ancestors gave rise to two evolutionary links to apes and human like animals.
(5) Later, the human evolution took place by changes in the brain volume, the ability to walk upright, excessive use of hand for manipulations.
(6) This journey of human evolution began 7 crore years ago. But the true wise and intelligent man arose around 50,000 years ago.

2. Continued genetic isolation leads to the formation of new species. Geographical barriers such as mountain ranges, seas or rivers may produce a barrier to gene flow and the inability of organisms or their gametes to meet leads to reproductive isolation and hence, speciation


3. Animal extinctions may be caused by natural occurrences such as climatic heating or cooling or changes in sea levels. ... Habitat destruction as farming land expands and forests are cut-down is the main cause of modern extinctions, along with pollution, the introduction of alien species, and over fishing or hunting.



I think it should help please it was really hard to write so please mark it brainiest ans
☺️☺️