Life Processes Test

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Life Processes Test - 59

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Question 1
1 / -0

Smoke is inhaled by the

A
Digestive system

B
Respiratory system

C
Nervous system

D
Excretory system
Question 2
1 / -0

Amoeba is a

A
Multicelled organism

B
Single-celled organism

C
Autotrophic organism

D
All of the above

Solution

Amoeba is a type of unicellular organism which has the ability to alter its shape, primarily by extending and retracting pseudopods.
Hence option 'B' is correct.
Question 3
1 / -0

The inner layer of the stomach releases

A
Water

B
Blood

C
Minerals

D
Digestive juices
Solution
- The stomach is made of 4 layers. They are serosa, muscularis, submucosa, mucosa. These layers of smooth muscle consist of the outer longitudinal, the middle circular, and the inner oblique muscles.
- The innermost layer or lining (mucosa) contains the glands that release digestive juices which includes pepsin, chymotrypsin, hydrochloric acid etc. Hence, The inner layer of the stomach releases digestive juices.
So, the correct answer is 'digestive juices'.
Question 4
1 / -0

In Amoeba which of the following helps in digestion?

A
Pseudopodia

B
Cytoplasm

C
Nucleus

D
Vacuole
Solution
- Digestion in Amoeba is intracellular; taking place within the cell.
- The food taken in remains in a food vacuole or gastric vacuole formed by the cell membrane and small part of the cytoplasm.
- The vacuoles are transported deeper into the cells by cytoplasmic movements. Here they fuse with lysosomes that contain enzymes. Hence, in Amoeba vacuole helps in digestion.
So, the correct answer is 'vacuole'.
Question 5
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The process of expelling waste out of the body from an organism is called

A
Digestion

B
Ingestion

C
Excretion

D
Reflex action
Solution
- The process of expelling waste from the organism is called excretion. Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals. Ammonia is the most toxic form and requires a large amount of water for its elimination, whereas uric acid, being the least toxic, can be removed with a minimum loss of water.
- The human excretory system consists of a pair of kidneys, ureter, urinary bladder and urethra.
- So, the correct answer is 'Excretion'.
Question 6
1 / -0

A carnivore eats

A
Sprouted seeds

B
Milk

C
Green leaves

D
Flesh of other animals

Solution

Carnivore is an animal which eats the flesh of other animals. They are placed at the top of a food chain. They obtain their prey either by predation or scavenging. The scavengers feed on the flesh of dead animals while the predator involves the killing of prey to fulfill the nutritional requirement. For example, lion and tiger.
So, the correct answer is 'Flesh of other animals'.
Question 7
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Which of the following eats the fruits of trees?

A

B

C

D
Solution
- According to their food requirements, living organisms can be producers that produce their own food by photosynthesis or consumers, which depend on producers for their food.
- Among consumers, organisms that eat plant and their products are called herbivores, and the ones that eat other animals are carnivores.
- In the given question, the first, third, and fourth images are of a cat, eagle, and snake. All of them are carnivores. While the second image is that of a monkey, which is a herbivore.
So, option B is the correct answer.
Question 8
1 / -0

Green plants can synthesize their own food. They are called ________.

A
Autotrophs

B
Heterotrophs

C
Parasites

D
All of the above
Solution
- Green plants are capable of producing their own food by the process of photosynthesis. They prepare food using carbon dioxide, water, sunlight, and chlorophyll. Thus, they are called primary producers or autotrophs.
- Heterotrophs are organisms that are incapable of making their own food from light or inorganic compounds. They feed on other organisms or the remains of other organisms.
Parasites are organisms that live in or on another organism and take nourishment from it.
So, the correct answer is option A.
Question 9
1 / -0

Name the oxygen carrying pigment.

A
Haemoglobin

B
Chlorophyll

C
Carotene

D
Light harvesting complex
Question 10
1 / -0

Directions For Questions

Plants produce a number of waste products during their life processes. As compared to animals, plants produce waste products very slowly and in very small amounts. The plants have no special organs for waste removal like the animals.
The plants remove their waste products by different methods. The main waste products by plants are carbon dioxide, water, vapor and oxygen. Carbon dioxide and water vapor are produced as wastes during respiration by plants whereas oxygen is produced as waste during photosynthesis. The gaseous wastes of respiration and photosynthesis in plants (carbon dioxide, water vapor and oxygen) are removed through the 'stomata' in leaves and 'lenticles' in stems and released to the air. The plants excrete carbon dioxide produced as a waste during respiration only at night time. This is because all the carbon dioxide produced during respiration in daytime is used up by the plant itself in photosynthesis. The plants excrete oxygen as waste only during the daytime (because oxygen is produced by photosynthesis only during the daytime when there is sunlight). Water vapor produced as a waste by respiration is, however, excreted by plants all the time (day as well as night). This waste water is excreted out by transpiration.
The plants also store some of the waste products in their body parts. For example, some of the waste products collect in the leaves, bark and ripe fruits fall off from a tree, thus the waste products contained in them are excreted. Some of the plant waste gets stored in the fruits of the plant in the form of solid bodies called raphides. These wastes are removed when the fruit gets detached from the plant. For example, the fruit called 'yam' (zamikand) has needle-shaped raphides on its surface. The plants secrete their wastes in the form of gum and resins from their stems and branches. The plants also excrete some waste substances into the soil around them.

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Write the name of a waste gas excreted by plants.
(a)Only during day time

A
Carbon dioxide

B
Oxygen

C
Water vapor

D
Both (B) and (C)