18. Answer in detail

1. Write short notes on – Timber yielding plants.

 

a. Hardwoods are obtained from _________.

 

b. Which of the following is an example of hardwood?

 

c. Decks, high-quality furniture, wooden constructions, hardwood flooring, and boat-building are only made using _________.

 

d. Softwoods are obtained from gymnosperms, and a few angiosperms also produce softwood.

 

e. Which one of the following is not made of softwood?

 

f. Which of the following is an example of softwood?

 

g. Angiosperm, also called _________.

 

h. Plywood is a _________ created by finely-cut wooden boards from wood.

 

i. We use wood for these purposes due to their features like ___________.

 

j. Softwoods are obtained from gymnosperms which are non-flowering trees.

 

2. Comment on importance of plant animal interaction.

 

a. Animals rely on plants for food and shelter TrueFalse.

 

b. Silk is produced by silkworms, which feed on mulberry leaves when they spin their cocoon FalseTrue.

 

c. The relationship between the silkworm and the plant is economically not useful for producing silk FalseTrue.

 

d. The bright colour of the flowers, the smell and honey attract insects TrueFalse.

 

e. When insects move from one plant to another, the pollen grains from their body gets transferred to the other flower, which results in self-pollination FalseTrue.

 

f. Bees are the best pollinators that produce honey FalseTrue.

 

g. Plants and algae that do not live in coral reefs provide food for a variety of fish FalseTrue.

 

h. Animals and birds, play an important role in spreading seeds of various plants TrueFalse.

 

i. The digestive enzymes of birds harden the seed's protective layer, allowing it to germinate TrueFalse.

 

j. Ecology is the science that deals with the inter-relationship between plants, animals and the environment TrueFalse.