BIOLOGY 2 Marks Questions

Plants with a high concentration of chlorophyll b but lacking chlorophyll a would still be able to carry out photosynthesis, albeit less efficiently. Chlorophyll b and other accessory pigments expand the range of light wavelengths that plants can absorb, allowing them to maximize their photosynthetic potential under different environmental conditions.

Linnaeus considered the species as unchangeable. But with the advance of evolutionary theory, the concept of species is changed. It says that the species are not static but dynamic and are the product of organic evolution.

Hormone: It is a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.
Hormones on the basis of chemical nature:
i. Steroid Hormones
ii. Amine Hormones
iii. Peptide Hormones
iv. Protein Hormones
v. Glycoprotein Hormones

Frogs are beneficial for mankind in various ways. Some are as follows:
i. Frogs eat many insects and pests. Thus, frogs help prevent damage to crops.
ii. Frogs are important links in the food chain and thus are important component of the ecosystem for maintaining ecological balance.
iii. In some countries, the muscular legs of frog are used as food by man.

The ventral surface is facing the sun while the dorsal surface is usually away from the sun. Stomata need to be in the direction of sun for facilitating transpiration and absorption of light energy.