Class"6(Apple) - Biology (Written) - 18th June
1) What are leaf spines? State the function of the leaf spines in Opuntia.
2) What are insectivorous plants? Give examples
3) What is the function of scale leaves?
4) Define photosynthesis.
5) Fill in the blanks:
a) In a
leaf the leaf blade is clearly divided into many distinct
parts
b) in pea plant the leaf is modified into a thin thread like coiled
structure called
c) The small slightly swollen part at the end of petiole is called
Answers
Answer:
They have small thorns instead of leaves due to transpiration in which sun rays absorb water from the leaves . So the spines in oputina helps avoiding transpiration because cactus grow in desert and if there will be leaves cactus will lose its water.
Insectivorous plants are flowering plants which lure insects to them, then trap them in some way. They then digest the insects for nutrients. Examples are the Venus fly trap, yellow pitcher plant and the cobra lily.
Typically these are thin, dry, stalkless, membranous structures, usually brownish in colour or sometimes colourless. Their function is to protect the axillary bud that they bear in their axil. Sometimes scale-leaves are thick and fleshy, as in/onion; then their function is to store up water and food.
The process by which green plants, algae, diatoms, and certain forms of bacteria make carbohydrates from carbon dioxide and water in the presence of chlorophyll, using energy captured from sunlight by chlorophyll, and releasing excess oxygen as a byproduct.