Which of the following are not secondary metabolites in plants?

NEET-2021 [Biomolecules] [class-xi ]

• Morphine, codeine
• Amino acids, glucose
• Vinblastin, curcumin
• Rubber, gums
Correct Option: B  [ Amino acids, glucose ]

Remark:

Which of the following stages of meiosis involves division of centromere?

NEET-2021 [Cell-Cycle-and-Cell-Division] [class-xi ]

• Metaphase I
• Metaphase II
• Anaphase II
• Telophase II
Correct Option: C  [ Anaphase II ]

Remark:

Match List-I with List-II.

NEET-2021 [Transport-in-Plants] [class-xi ]

• A-IV, B-III, C-II, D-I
• A-III, B-I, C-IV, D-II
• A-II, B-I, C-IV, D-III
• A-II, B-IV, C-I, D-II
Correct Option: D  [ A-II, B-IV, C-I, D-II ]

Remark:

The first stable product of CO₂ fixation in sorghum is:

NEET-2021 [Photosynthesis-in-Higher-Plants] [class-xi ]

• Pyruvic acid
• Oxaloacetic acid
• Succinic acid
• Phosphoglyceric acid
Correct Option: B  [ Oxaloacetic acid ]

Remark:

The site of perception of light in plants during photoperiodism is:

NEET-2021 [Plant-Growth-and-Development] [class-xi ]

• Shoot apex
• Stem
• Axillary bud
• Leaf
Correct Option: D  [ Leaf ]

Remark:

The plant hormone used to destroy weeds in a field is:

NEET-2021 [Plant-Growth-and-Development] [class-xi ]

• IAA
• NAA
• 2,4-D
• IBA
Correct Option: C  [ 2,4-D ]

Remark:

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:

NEET-2021 [Plant-Growth-and-Development] [class-xi ]

• Elasticity
• Flexibility
• Plasticity
• Maturity
Correct Option: C  [ Plasticity ]

Remark:

Which of the following plants is monoecious?

NEET-2021 [Reproduction-in-Organisms] [class-xii ]

• Carica papaya
• Chara
• Marchantia polymorpha
• Cycas circinalis
Correct Option: B  [ Chara ]

Remark:

A typical angiosperm embryo sac at maturity is:

NEET-2021 [Sexual-Reproduction-in-Flowering-Plants] [class-xii ]

• 8-nucleate and 7-celled
• 7-nucleate and 8-celled
• 7-nucleate and 7-celled
• 8-nucleate and 8-celled
Correct Option: A  [ 8-nucleate and 7-celled ]

Remark:

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

NEET-2021 [Sexual-Reproduction-in-Flowering-Plants] [class-xii ]

• Xenogamy
• Geitonogamy
• Chasmogamy
• Cleistogamy
Correct Option: A  [ Xenogamy ]

Remark: