Evolution — BIOLOGY STD 12 Science — Question

Explain in which fundamental processes, the density of a population in a given habitat increases are decreases during a given period.

What are genetically modified organisms? Name two factors on which their behaviour depends.

Define analogous organ. Give one example of analogous organ.

1. You are given tall pea plants with yellow seeds whose genotypes are unknown. How would you find the genotype of these plants? Explain with the help of cross.
2. Identify a, b and c in the table given below:

S. No.	Pattern of inheritance	Monohybrid F1 phenotypic expression
i.	Co-dominance	a
ii.	b	The progeny resembled only one of the parents
iii.	Incomplete dominance	c

Reproductive and Child Healthcare (RCH) programmes are currently in operation. One of the major tasks of these programmes is to create awareness amongst people about the wide range of reproduction related aspects. As this is important and essential for building a reproductively healthy society.

1. 'Providing sex education in schools is one of the way to meet this goal'. Give four points in support of your opinion regarding this statement.
2. List any two 'indicators' that indicate a reproductively healthy society.

i. Why is tender coconut considered as a healthy source of nutrition?
ii. How are pea seeds different from castor seeds with respect to endosperm?

What are the fundamental difference between In-situ and Ex-situ conservation.

Name the glandular layer of human uterus.

Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.

What is the significance of the slope of regression in a species-area relationship?