Sub-science
Q1. Fill in the blanks:
(4x1/2=2)
1. Sepals help protect the while petals help
2 The reproductive parts in a flower are and
Q2. Match the column:
(4)
1. Reptiles
Turtle
Mammals
Birds
fur/hair
feathers
shells
scales
Q3. Choose the correct option.
Which one is not a land animal?
a. Octopus b. Crocodile C. Snake d. Squirrel
2. Hair can be found on the body of
a Human b. Earthworms c. Peacock d. Lizards
3. Which is not true of flower.
a. Reproductive parts of a flower
b. Change into fruit
Contain seeds
d. Attractive
4. Which among the following is not required for germination
Water b. Air c. Sunlight d. Pressure
04. Short answer type questions:
(2x2=4)
1. What is the function of stamen and carpel in a flower?
2. How do spiracles help insect?
Q5. Long answer type questions. (3x2=6)
1. What is the purpose of scale and shells in animals?
2. Why seeds need to be dispersed?
Answers
Answer:
1) (i)Petals are often brightly colored so pollinators will notice them. Sepals protect the developing flower while it is still a bud. Sepals are usually green, which camouflages the bud from possible consumers.
(ii) stamen and carpel
2) question is not appropriate
3) (a) b. crocodile
(b) a. humans
(c) here, all statements are true for a flower
(d) d. pressure
(4) (i)The stamens are male reproductive structures that produce pollen. The carpels are female reproductive structures that produce egg cells and protect a developing baby plant, or embryo. The three main parts of a carpel are the stigma, style, and ovary. The stigma is where pollination occurs.
(ii)Insects have spiracles on their exoskeletons to allow air to enter the trachea. In insects, the tracheal tubes primarily deliver oxygen directly into the insects' tissues. The spiracles can be opened and closed in an efficient manner to reduce water loss.
5) (i)Shells serve as protection from attack, and in some cases actually serve as a sort of hot air balloon, like in the case of the Nautilus.
The cuttlefish relative uses gases in the chambers of its shell to keep it hovering at a certain level, allowing it to focus solely on forward locomotion. Shells can also double as camouflage. Many hermit crabs and other crustaceans not only protect from attack, but also allow the growth of algae and plants, forming natural camouflage. Armadillos are one example of the few mammals with shells.
Scales come in a number of forms, but all serve their purpose. Some serve as simple but effective armor, like the Pangolin, the only known scaled mammal.The keratin-based scales are tough and sharp on the edges, and all the Pangolin has to do is curl up in a ball until the predator gets frustrated and leaves. Reptilian scales serve less as protection and more as waterproofing. Reptiles are optimized to conserve water, and having scaled hides prevents water escaping and being lost like it would with soft skin. Scales also function like skids, allowing snakes to move smoothly and freely across the ground or in water with less resistance.
(ii)Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.
OR
(ii)Dispersal of seed is important as if seeds germinate near to parent plants it will increase a lot of competition for air, water, and food as well.
If competition increases it will lead to the death of the species and dispersal also leads to exposure to a new environment that helps in adaptation and evolution.