Ques 2 Fill in the blanks
(10 marks)
Name a uni cellular organism
2 Human beings exchange gases (oxygen and carbon dioxide) with the help of
3______is the centre of the cell
4 Plant cells have a rigid cell wall outside the____
5 Removal of wastes in living beings is called_____
6 Plants can_______their own food
7 Bees help plants in______
8 The webbed foot of the frog helps it in______
9_________can store food in its hump
10. Plants growing in the desert are known as_______
Il In plants, the taproot is formed from_______
12 Veins are present in which part of the plant body_______
13 Name an animal which has a shell_____
14 Biceps and Triceps are a pair of_______
15 Hydra moves with the help of its______
16 Tomato s which part of a plant______
17 Parasites_____food from their host
18 Kwashiorkor s caused due to deficiency of______
19 Night blindness s caused due to deficiency of_______
20. Sea food is a good source of_______
Answers
Answer:
2. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli. The walls of the alveoli actually share a membrane with the capillaries in which oxygen and carbon dioxide move freely between the respiratory system and the bloodstream.
3. The most integral component of the cell is the nucleus (plural: nuclei). ... A nucleus is defined as a double-membraned eukaryotic cell organelle that contains the genetic material.
4. Plant cells have a cell wall, a large central vacuole, and plastids such as chloroplasts. The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection.
5. Excretion is a process by which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin. This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life.
6. The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis.
7. Bees are perfectly adapted to pollinate, helping plants grow, breed and produce food. They do so by transferring pollen between flowering plants and so keep the cycle of life turning. The vast majority of plants we need for food rely on pollination, especially by bees: from almonds and vanilla and apples to squashes.
8. Webbed feet assist them in swimming. Frogs who have them swim faster. They create more surface area, allowing the frogs to apply more force against the surrounding water.
9. Camel can store food in its hump.
10. xerophytes
There are some plants, however, that have adapted to the almost waterless conditions of the desert. These plants are called xerophytes. Xerophytes tend to have small, waxy leaves, which help the plant to retain water. Some, such as cacti, can store water in their trunks.
11. Dicots, one of the two divisions of flowering plants (angiosperms), start with a taproot, which is one main root forming from the enlarging radicle of the seed. The tap root can be persistent throughout the life of the plant but is most often replaced later in the plant's development by a fibrous root system.
12. leaf
The veins are the vascular tissue of the leaf and are located in the spongy layer of the mesophyll. The pattern of the veins is called venation.
13. A shell is a hard, rigid outer layer, which has evolved in a very wide variety of different animals, including mollusks, sea urchins, crustaceans, turtles and tortoises, armadillos, etc. Scientific names for this type of structure include exoskeleton, test, carapace, and peltidium.
14. Antagonist and agonist muscles often occur in pairs, called antagonistic pairs. As one muscle contracts, the other relaxes. An example of an antagonistic pair is the biceps and triceps; to contract, the triceps relaxes while the biceps contracts to lift the arm.
15. A structure called a basal disc on the bottom of the tube-like body secretes a sticky substance which helps hydras to attach themselves to a solid base. Hydras move their bodies about in the water while they are attached, extending and contracting by a mixture of muscle movement and water (hydraulic) pressure.
16. fruit
Botanically, a tomato is a fruit—a berry, consisting of the ovary, together with its seeds, of a flowering plant
17. Parasites are plants or animals that live in or on another living thing, getting their food from it while it is still alive. The organisms that they live on are called hosts. Hosts never benefit from parasites. In fact, some parasites eventually cause their hosts to die.
18. Kwashiorkor is caused by a lack of protein in the diet. Every cell in your body contains protein. You need protein in your diet for your body to repair cells and make new cells.
19. In rare cases in the United States or in other parts of the world where nutritional diets may vary, vitamin A deficiency can also lead to night blindness. Vitamin A, also called retinol, plays a role in transforming nerve impulses into images in the retina. The retina is a light-sensitive area in the back of your eye.
20. Seafood provides essential nutrients to the body. These include vitamins A, B, and D, as well as omega-3 fatty acids. Fish is also rich in calcium and phosphorus and a great source of minerals, such as iron, zinc, iodine, magnesium, and potassium. Vitamin A helps protect vision and boost immune systems.