Plant and Animal Hormones One Mark Online Test

Plant and Animal Hormones One Mark Online Test (10th Standard Science)

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Gibberellins cause:

A.Shortening of genetically tall plants B.Elongation of dwarf plants C.Promotion of rooting D.Yellowing of young leaves

The hormone which has positive effect on apical dominance is:

A.Cytokinin B.Auxin C.Gibberellin D.Ethylene

Which one of the following hormones is naturally not found in plants:

A.2, 4-D B.GA3 C.Gibberellin D.IAA

Avena coleoptile test was conducted by

A.Darwin B.N. Smit C.Paal D.F.W. Went

LH is secreted by

A.Adrenal gland B.Thyroid gland C.Anterior pituitary D.Hypothalamus

Identify the exocrine gland

A.Pituitary gland B.Adrenal gland C.Salivary gland D.Thyroid gland

Which organ acts as both exocrine gland as well as endocrine gland

A.Pancreas B.Kidney C.Liver D.Lungs

Which one is referred as "Master Gland"?

A.Pineal gland B.Pituitary gland C.Thyroid gland D.Adrenal gland

Who introduced the term 'auxin' in 1931 to describe the plant growth-promoting substance?

A.Charles Darwin B.Kogl and Haagen-Smith C.Frits Warmolt Went D.E. H. Starling

Q10

Which of the following plant growth regulators is classified as a naturally occurring auxin?

A.Alpha-Naphthalene Acetic Acid (NAA) B.Indole-3-Butyric Acid (IBA) C.Phenyl Acetic Acid (PAA) D.2,4-Dichlorophenoxy Acetic Acid (2,4-D)

Q11

The delay of leaf senescence and aging in plants brought about by the application of cytokinins is known as:

A.Bakanae effect B.Richmond Lang effect C.Went curvature effect D.Apical dominance effect

Q12

Artificial induction of sudden stem elongation followed by flowering in rosette plants using gibberellins is referred to as:

A.Parthenocarpy B.Abscission C.Bolting D.Senescence

Q13

Why is abscisic acid (ABA) commonly referred to as the 'stress hormone' in plants?

A.It speeds up fruit ripening during summer months. B.It increases plant tolerance to environmental stress conditions like drought. C.It promotes rapid cell division during severe temperature fluctuations. D.It stimulates excessive water loss through stomatal pores.

Q14

Which plant hormone is a gaseous molecule primarily responsible for fruit maturation and ripening?

A.Cytokinin B.Ethylene C.Gibberellin D.Abscisic acid

Q15

Which chemical messenger was the very first hormone discovered in 1902 by Bayliss and Starling?

A.Insulin B.Secretin C.Thyroxine D.Adrenaline

Q16

Which hormone secreted by the anterior pituitary stimulates milk production after childbirth?

A.Oxytocin B.Prolactin C.Vasopressin D.Luteinizing hormone

Q17

A deficiency in Vasopressin (Antidiuretic Hormone) leads to which clinical condition?

A.Diabetes mellitus B.Diabetes insipidus C.Simple goitre D.Cretinism

Q18

Hypothyroidism in adults leading to mental sluggishness, puffiness of the face, and low basal metabolic rate is known as:

A.Cretinism B.Grave's disease C.Myxoedema D.Acromegaly

Q19

Tetany, a condition characterized by painful muscle spasms, is caused by hyper-secretion or hypo-secretion of which hormone?

A.Hyper-secretion of insulin B.Hypo-secretion of parathormone C.Hyper-secretion of thyroxine D.Hypo-secretion of growth hormone

Q20

In the Islets of Langerhans of the pancreas, which specific cells are responsible for secreting glucagon?

A.Alpha cells B.Beta cells C.Delta cells D.Acinar cells

Q21

Aldosterone, the primary mineralocorticoid regulating sodium reabsorption and electrolyte balance, is secreted by which layer of the adrenal cortex?

A.Zona reticularis B.Zona fasciculata C.Zona glomerulosa D.Adrenal medulla

Q22

Epinephrine and Norepinephrine are called 'emergency hormones' because they:

A.Promote glycogen storage in liver cells during rest. B.Prepare the body to face stress, fight, fright, or flight situations. C.Decrease respiratory rate and slow down heart rate during activity. D.Constrict bronchioles and reduce blood pressure.

Q23

Which hormone secreted by the thymus gland plays a crucial role in promoting the maturation and differentiation of T-lymphocytes?

A.Thyroxine B.Thymosin C.Testosterone D.Melatonin

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This free online practice test covers Plant and Animal Hormones from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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