II. Short Answer Questions.
1. Give reasons:
a. Conifers have needle-shaped leaves.
b. Conifers have drooping branches
c. Lots of grazing animals are found in
grasslands
d. A camel stores its food in humps
Answers
Answer:
A.Conifers, or cone-bearing trees, evolved to have needles that retain more water and seeds that could hang out until there was enough moisture to take root. ... Needles have lower wind resistance than big, flat leaves, so they're less likely to make the tree fall over during a big storm.
b.Most pine and spruce conifer species tend to have upturned branches. This branch growth helps to distinguish them from conifers like firs as their branches are usually downward turned. Because spruce needles grow from small woody pegs, spruce branches are rough and jaggy.
c. These grasses can support high densities of grazing animals, such as zebra, antelope and bison. And these herds in turn support iconic predators, including lions and cheetahs. Grassland ecosystems are particularly fragile because water is scarce. ... Few grasslands are protected from development.
D.A camel's hump does not hold water at all – it actually stores fat. The camel uses it as nourishment when food is scarce. If a camel uses the fat inside the hump, the hump will become limp and droop down. ... The hump is not used for water storage, but camels can go for long periods of time without water.
Explanation:
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Answer:
a. Conifers, or cone-bearing trees, evolved to have needles that retain more water and seeds that could hang out until there was enough moisture to take root. ... Needles have lower wind resistance than big, flat leaves, so they're less likely to make the tree fall over during a big storm.
b. Most pine and spruce conifer species tend to have upturned branches. This branch growth helps to distinguish them from conifers like firs as their branches are usually downward turned. Because spruce needles grow from small woody pegs, spruce branches are rough and jaggy.
c. These grasses can support high densities of grazing animals, such as zebra, antelope and bison. And these herds in turn support iconic predators, including lions and cheetahs. Grassland ecosystems are particularly fragile because water is scarce.
d. A camel's hump does not hold water at all – it actually stores fat. The camel uses it as nourishment when food is scarce. If a camel uses the fat inside the hump, the hump will become limp and droop down. ... The hump is not used for water storage, but camels can go for long periods of time without water.