Biology
Assertion (A): Most mammals give birth to young ones and feed them with milk produced in the mother's mammary glands.
Reason (R): Aquatic and flying mammals do not feed their babies with milk as their surroundings make it difficult.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is true but R is false.
Reason — A is true as most mammals are viviparous. They feed their young with milk produced by mammary glands.
R is false as all mammals, including aquatic (e.g., whales, dolphins) and flying mammals (bats), do feed their young with milk. The environment does not prevent milk feeding.
Therefore, A is true but R is false is the correct option.
Related Questions
Assertion (A): Most animals move from one place to another mainly in search of food or shelter but plants do not move.
Reason (R): Animals are heterotrophs whereas plants are autotrophs. Hence, plants are capable of making their own food and do not move from one place to another.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Tortoises and crocodiles belong to the class - amphibia of the phylum chordata.
Reason (R): They can live in water as well as on the land and reproduce successfully.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Name one example each of an animal which shows the following characteristics:
(i) Fixed animal with a pore-bearing body (ii) Star-shaped body (iii) Can live in water as well as on land (iv) Has a flattened ribbon-like body
Match the animals given under column A with their respective classification group given under column B.
Sl.
No.Column A Column B 1. Sponge Amphibia 2. Snail Reptilia 3. Butterfly Echinodermata 4. Toad Mollusca 5. Lizard Arthropoda 6. Starfish Porifera