Which of the following are not secondary metabolites in plants? [2021]
Rubber, gums
Morphine, codeine
Amino acids, glucose
Vinblastine, curcumin
(3)
Amino acids and glucose are categorized as primary metabolites because they are directly involved in basic metabolic processes and normal growth and development.
Identify the incorrect pair. [2021]
Drugs – Ricin
Alkaloids – Codeine
Toxin – Abrin
Lectins – Concanavalin A
(1)
Ricin is a toxin
Secondary metabolites such as nicotine, strychnine, and caffeine are produced by plants for their [2020]
nutritive value
growth response
defence action
effect on reproduction
(3)
Nicotine, strychnine, and caffeine are examples of alkaloids. These are secondary metabolites produced by plants for defense against herbivores and pathogens
Concanavalin A is [2019]
a pigment
an alkaloid
an essential oil
a lectin
(4)
Concanavalin A is a lectin, a secondary metabolite that does not play a direct role in the growth and development of plants but is present at certain developmental stages.
Match List I with List II. [2023]
| List I | List II | ||
| (A) | Terpenoids | (I) | Codeine |
| (B) | Lectins | (II) | Diterpenes |
| (C) | Alkaloids | (III) | Ricin |
| (D) | Toxins | (IV) | Concanavalin A |
Choose the correct answer from the options given below.
(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
Which of the following is not a secondary metabolite? [2023]
Curcumin
Morphine
Anthocyanin
Lecithin
(4)
Secondary metabolites are derivatives of primary metabolites which have no direct function in growth and development of plants. Lecithin is a phospholipid and a primary metabolite.
