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Biology 1525 MCQs [All-Courses]

Biology covers key concepts of life, organisms, and human systems with exam-focused notes for PPSC, FPSC, KPPSC, BPSC.,NTS, OTS, AJKPSC. Clear, concise topics help students prepare effectively for competitive tests.

The only promoter of leaf senescence in the following plant hormones is________________?

A Gibberellins

B Cytokinins

C Auxins

D Abscisic Acid

Review Detailed Answer

Correct Answer: Abscisic Acid

Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering______________?

A Gibberellins

B Cytokinins

C Auxins

D Ethene.

Review Detailed Answer

Correct Answer: Gibberellins

Which of the following is antagonist to Auxin in terms of promotion of stem growth______________?

A Gibberellins

B Cytokinins

C Abscisic Acid

D none of these.

Review Detailed Answer

Correct Answer: Abscisic Acid

Gibberellins may be substituted for ___________ light, therefore promote flowering in long day plants?

A White

B Red

C Blue

D Green

Review Detailed Answer

Correct Answer: Red

Chemically auxins are____________?

A Indole propionic acid.

B Indole carboxylic acid.

C Indole acetaldehyde

D Indole acetic acid.

Review Detailed Answer

Correct Answer: Indole acetic acid.

Chlorosis, i.e., yellowish hue on the leaves results from_____________?

A Accumulation of toxic waste products in leaves.

B Deficiency of chlorophyll.

C Short supplies of mineral nutrients in the soil.

D All of these

Review Detailed Answer

Correct Answer: All of these

Which of the following tracheophytes are leafless?

A Psilopsida

B Lycopsida

C Sphenopsida

D Prteropsida

Review Detailed Answer

Correct Answer: Psilopsida

Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?

A Psilopsida

B Lycopsida

C Sphenopsida

D Prteropsida

Review Detailed Answer

Correct Answer: Lycopsida

Which of the following group of tracheophyta has expanded or scale like leaves which are alwaysed arranges in whorls?

A Psilopsida

B Lycopsida

C Sphenopsida

D Prteropsida

Review Detailed Answer

Correct Answer: Sphenopsida

Stem of Psilophyton an example of psilogsida is differentiated into an underground rhizome and an aerial part both of which are _________ branched

A Isotomous

B Dichotomously

C Trichotomously

D Multichotomously

Review Detailed Answer

Correct Answer: Dichotomously

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Biology 1525 MCQs [All-Courses]

All Topics 1525

All Topics 1525

The only promoter of leaf senescence in the following plant hormones is________________?

Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering______________?

Which of the following is antagonist to Auxin in terms of promotion of stem growth______________?

Gibberellins may be substituted for ___________ light, therefore promote flowering in long day plants?

Chemically auxins are____________?

Chlorosis, i.e., yellowish hue on the leaves results from_____________?

Which of the following tracheophytes are leafless?

Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?

Which of the following group of tracheophyta has expanded or scale like leaves which are alwaysed arranges in whorls?

Stem of Psilophyton an example of psilogsida is differentiated into an underground rhizome and an aerial part both of which are _________ branched