Diversity In Living Organisms — Science STD 9 — Question

A branch of biology which deals with the identification, nomenclature and classification of organisms is called:

1. Morphology.
2. Ecology.
3. Taxonomy.
4. Phytogeography.

Each of the following statement describes a force acting. Which force is causing work to be done?

1. The weight of a book at rest on a table.
2. The pull of a moving railway engine on its coaches.
3. The tension in an elastic band wrapped around a parcel.
4. The push of a person's feet when standing on the floor.

Find out the correct sentence.

1. Hybridization means crossing between genetically dissimilar plants.
2. Cross between two varieties is called as inter-specific hybridization.
3. Introducing genes of desired characters into a plant gives genetically modified crop.
4. Cross between plants of two species is called as inter varietal hybridization.

1. (i) and (ii)
2. (ii) and (iv)
3. (ii) and(iii)
4. (iii) and (iv)

Describe community issues that influence health.