Question

Auxins include _______.
(A) IAA
(B) Cytokinin
(C) Gibberellin
(D) Ethylene
Choose the correct answer from the options given below:

• (A) and (D) only
• (A) and (B) only
• (B) and (C) only
• (A) only

Answer 1

The Correct Option is B

Auxins are a class of plant hormones that play a crucial role in the coordination of many growth and behavioral processes in the plant's life cycle. Let's examine the options: 

• (A) IAA: Indole-3-acetic acid (IAA) is the principal auxin in plants.
• (B) Cytokinin: This is another type of plant hormone, primarily involved in cell division, not categorized under auxins.
• (C) Gibberellin: Gibberellins are plant hormones that regulate growth and influence various developmental processes, also distinct from auxins.
• (D) Ethylene: Ethylene is a plant hormone involved in the ripening of fruits and is not part of the auxin group.

Hence, the correct option would be (A) only, as IAA is the only compound listed that is classified as an auxin.

Answer 2

The correct answer is (2) (A) and (C) only.

Forage crops are plants that are grown specifically to be used as feed for livestock. These crops are usually high in nutrients and provide the necessary food for animals, particularly herbivores.

Let's break down the options:

(A) Berseem: Berseem is a forage crop. It is a type of clover used as fodder for livestock.

(B) Safflower: Safflower is not a forage crop. It is mainly grown for its seeds, which are used for oil production, and it is not used as livestock feed.

(C) Lucerne: Lucerne, also known as alfalfa, is a forage crop. It is widely used as animal fodder, particularly for dairy cattle and other livestock.

(D) Sunflower: Sunflower is not a forage crop. It is grown for its seeds, which are used for oil extraction and as food, but not primarily for animal feed.

Thus, Berseem and Lucerne are forage crops, so the correct answer is (2) (A) and (C) only.