LIFE CAN ADAPT
Q.1. Define :
1.
Habitat 2. Adaptation 3. Succulents 4. Halophytes 5. Mesophytes
Q.2. Give reasons :
a. Speed is important for certain animals to survive
in grasslands.
Ans.
Speed is important for certain animals to survive in grasslands in order to
escape from predators.
b. Desert animals like
rat , snakes , etc. dig burrows.
Ans.
The burrows protect them from heat and loss of water from their body.
c. Leaves of mountain region trees are needle like.
Ans.
Leaves of mountain region trees are
needle like to slide off easily the rain water and snow.
d. Lion has :
i. rusty colour
ii. eyesinfront of face
iii. strong claws
Ans.
i.
Rusty brown colour—to hide in grasslands.
ii.
Eyes infront—to locate its prey.
iii. Strong
claws--- to creep up to its prey without
making sound while hunting.
e. Deer has
i. eyes located on side
ii. strong teeth
Ans.
i. .eyes located on side—to look in all directions for danger.
ii.
strong teeth—for chewing hard plants stems of the forest.
f. Roots of aquatic
plants are absent or poorly developed.
Ans.
Due to abundant water absorbed directly by plants, the roots of aquatic plants
become less significant .Therefore, these are either absent or poorly
developed.
Q.3. Q/A-----
1. Name the body part
that help frog –
a. to swim in water
b. catch prey
Ans.
a. Webbed feet
b.
Strong back legs
2. How are desert
plants adapted in desert?
Ans. The following features help the desert plants to
survive in desert---
· Leaves
modified to spines to prevent water loss.
· Stems
carry out photosynthesis.
· Stems
are also covered with thick waxy layer to retain water.
· Extensive
root system so as to go very deep into the soil to absorb water.
3. List the features of
plants in grasslands.
Ans.
The features of plants are ----
· The
grasses growing here have flexible stalks so that they bend and do not break in
windy conditions.
· They
have strong roots to anchor the grass and small leaves to reduce loss of water.
· Trees
growing here are also small with small leaves and the roots go deep into the
soil in search of water.
4. List the features
possessed by animals living on mountains.
Ans.i.
These animals have thick skin or fur to protect them from cold.
ii.
They also have a thick layer of fat beneath their skin for insulation against
cold.
iii. Some
animals like mountain goats has long hair to keep it warm and strong hooves for
running up the rocky slopes of the mountains.
5.
How do dolphins and whales breathe?
Ans. Aquatic animals like
dolphins and whales do not have gills. They breathe in air through nostrils or
blowholes that are located on upper parts of their heads. They can stay inside
water for a long time without breathing. They come out time to time to breathe
in air.
6. What makes aquatic plant float?
Ans.
Aquatic plants can float because of the following features—
i.
Their stems are long, slender,
weak, spongy ( Have air spaces) and flexible. This reduces the weight of plants
and thus help them in floating. Eg. In Nelumbo.
ii.
In some plants like Lemna, leaves are flat, broad and
covered with waxy coating to repel water.
iii.
In submerged plants, all parts grow
underwater. They have narrow and thin ribbon like leaves which can bend in
flowing water.
7.
Why camel is called ship of desert?
Ans. Camel is called as ship of desert because of
its following features---
DRAW DIAGRAM (PG. NO. 103) FROM
TEXTBOOK.
Q.4. Differences between ----
i. Xerophytes and hydrophytes
Ans.
ii.
Floating plants and submerged plants---
|
Floating
plants
|
Submerged
plants
|
|
1.These
plants floats freely on water
|
1.
These plants are submerged in water.
|
|
2.
Their leaves are flat and broad.
|
2.
Their leaves are thin and ribbon like.
|
|
3. Eg. Lemna, Wolffia, etc.
|
3. Eg. Hydrilla, Vallisneria, etc.
|
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