Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns

COLUMN – A	COLUMN – B
1. Meninges	(a) Decrease in the number of digits in the legs
2. Sexual reproduction	(b) Submergence of islands
3. Roller tongue	(c) Centromere
4. Evolution of the horse	(d) Telomere
5. Environmental problem of Sundarban	(e) Protects brain and spinal cord from mechanical injury
6. Attaches chromosome with spindle fibre	(f) Controlled by autosome
	(g) Occurs through the production of gametes and their union

Explain the theory of Darwin with regard to the lengthening of the neck of a giraffe. What do you mean by 'Hot Dilute Soup'? [3+2=5] OR Construct the sequence of major events of organic evolution with the help of a schematic diagram. Give two examples of the problem-solving ability of chimpanzees. [3+2=5]

With the help of a checkerboard show the phenotypic ratio of offspring produced in F2 generation as a result of a cross between a pure black coloured and rough-haired guinea pig and a pure white and smooth-haired guinea pig. "Father plays the main role in the determination of sex of the offspring" - justify the statement with the help of a checkerboard. [3+2=5] OR Write three reasons behind Mendel's success. Establish a relationship between phenotype and genotype with the help of proper examples. [3+2=5]

Explain the following three significances of cell division- Growth Repair Reproduction Tabulate the site of occurrences of meiotic cell division in the living world. [3+2=5] OR Explain the process of micropropagation. Distinguish between asexual and sexual reproduction on the basis of the following three features - No. of Parental organisms Cell Division Origin of variation [2+3=5]

Write one function of each of the following five parts of the human eyeball: [1 × 5 = 5] (a) Cornea (b) Lens (c) Choroid (d) Vitreous humour (e) Retina OR Mention three changes occurring during the Anaphase stage of mitosis in an animal cell. Write the names of any two structural parts of the eukaryotic chromosome. [ 3 + 2 = 5]

What do you mean by natural selection?

An inherent trait of organisms is the prodigality of reproduction; as a result, the number of organisms increases in a geometric proportion - justify the validity of the statement with two proper examples.

Write two reasons behind the selection of pea plants by Mendel for his experiments on heredity.

Explain the process of segmentation with the help of a proper example of plants.

Mention any two phenomena during G1 phase of Interphase.

Write two features of Amitotic cell division.

Explain the following two terms: Ganglia and Synapse.

The two reflex actions, namely sneezing and coughing help in avoiding danger – justify the statement.