Xylem translocates:

NEET-2019 Transport-in-Plants [class-xi ]

• Water only
• Water and mineral salts only
• Water, mineral salts and some organic nitrogen only
• Water, mineral salts, some organic nitrogen and hormones
Correct Option: D  [ Water, mineral salts, some organic nitrogen and hormones ]

Remark:

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

NEET-2019 Transport-in-Plants [class-xi ]

• Flaccidity of bulliform cells
• Closure of stomata
• Shrinkage of air spaces in spongy mesophyll
• Tyloses in vessels
Correct Option: A  [ Flaccidity of bulliform cells ]

Remark:

What is the direction of movement of sugars in phloem?

NEET-2019 Transport-in-Plants [class-xi ]

• Non-multidirectional
• Upward
• Bi-directional
• Downward
Correct Option: C  [ Bi-directional ]

Remark:

Thiobacillus is a group of bacteria helpful in carrying out:

NEET-2019 Mineral-Nutrition [class-xi ]

• Denitrification
• Nitrogen fixation
• Chemoautotrophic fixation
• Nitrification
Correct Option: A  [ Denitrification ]

Remark:

Respiratiory Quotient (RQ) value of tripalmitin is:

NEET-2019 Respiration-in-Plants [class-xi ]

• 0.9
• 0.07
• 0.7
• 0.09
Correct Option: C  [ 0.7 ]

Remark:

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

NEET-2019 Plant-Growth-and-Development [class-xi ]

• Gibberellin and Cytokinin
• Gibberellin and Abscisic acid
• Cytokinin and Abscisic acid
• Auxin and Ethylene
Correct Option: D  [ Auxin and Ethylene ]

Remark:

What is the site of perception of photoperiod necessary for induction of flowering in plants:

NEET-2019 Plant-Growth-and-Development [class-xi ]

• Lateral buds
• Pulvinus
• Leaves
• Shoot apex
Correct Option: C  [ Leaves ]

Remark:

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

NEET-2019 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Ovules develop into embryo sac
• Ovary develops into fruit
• Zygote develops into embryo
• Central cell develops into endosperm
Correct Option: A  [ Ovules develop into embryo sac ]

Remark:

Is some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as:

NEET-2019 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Parthenogenesis
• Syngamy
• Parthenocarpy
• Autogamy
Correct Option: A  [ Parthenogenesis ]

Remark:

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers.
Choose the incorrect statement from the following :

NEET-2019 Principles-of-Inheritance-and-Variation [class-xii ]

• Law of Segregation does not apply in this experiment.
• Ratio of F₂ is ¼ (Red): 2/4 (Pink): ¼ (White)
• Pink colour in F₁ is due to incomplete dominance.
• This experiment does not follow the Principle of Dominance
Correct Option: A  [ Law of Segregation does not apply in this experiment. ]

Remark: