List of top Science Questions on Biology

Which structure in a leaf is mainly responsible for gaseous exchange?

Given below is a pyramid showing various trophic levels in an ecosystem:

(a) From the organisms listed below, identify which one is to be placed at which trophic level:
Deer, Grass, Lion, Snake, Rabbit
(b) Discuss the reason why primary consumers will have more energy as compared to secondary consumers?
(c) Why is the base of the pyramid broad?

From the given situations, identify 'Chemotropic' and 'Geotropic' movements in parts of plants, respectively:
(i) Growth of pollen tube towards ovule.
(ii) Movement of sunflower towards sunlight.
(iii) Movement of root towards Earth/Gravity.
(iv) Movement of leaves due to breeze.

Plants use variety of techniques to get rid of their waste materials. Some are mentioned below. Identify the incorrect one:

Write down four differences between producers and consumers.

Draw the structure of a nerve cell and describe its functions.

Describe sex determination process in human beings with diagram.

Define Phototropism and Geotropism with the help of suitable diagrams.

Describe the structure and function of nephron in humans.

Draw a labelled diagram of structure of Neuron and describe its functions.

Describe the female reproductive system of human beings with a diagram.

Write an essay on human hormones.

Pyruvate is oxidized in which part of the cell in presence of oxygen?

Unit of kidney, which takes part in the process of excretion is:

Autotrophic nutrition requires:

What do you mean by endocrine glands? Describe the functions of hormones secreted by any four endocrine glands in humans.

Which one of the following is formed inside the anther?

In humans, digestion starts with which organ?

Which of the following is a plant hormone?