Chemical Coordination in Plants — Biology STD 10 — Question

What are the two kinds of diabetes? Mention their symptoms and the causes.

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A&B), the container (A) having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had somewhat decreased in size. Use the above information to answer the questions that follow: Account for the firmness and increase in the size of the potato cubes placed in water.

Name the stimulus which causes the following movements in plants.
phototropism,thigmotropism, hydrotropism and geotropism

Differentiate between:
monohybrid and dihybrid cross (phenotypic ratio)

Sterilization in men means preventing the flow of sperms into the seminal vesicles by cutting or ligaturing the vas deferens. Can there be a corresponding operation made in women? If yes, where?

A lot of fish are dying near a sea shore. Describe any two possible causes.

Draw a diagram of the human eye as seen in a vertical section and label the part which suits the following functions/descriptions :
(i) The layer which prevents reflection of light
(ii) The structure that helps to focus light on retina
(iii) The region of distinct vision
(iv) The part which transmits the impulse to the brain
(v) The outermost transparent layer in front of the eye lens
(vi) The fluid present in the anterior part of the eye in from of the eye lens

How can the knowledge of processes of reproduction help people in limiting the size of their families? Give two concrete examples

Explain the Term: Hypermetropia

Explain the Term: The Bowman’s capsule