Tag: theories of meristematic cell development

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Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Match column I with column II and select the correct option from the given codes.

   Column  I     Column II
 A.  Vegetative buds  i.  Buds develop in axils of leaves
 B.  Floral buds  ii.  Buds produce leafy shoots 
 C.  Axillary buds  iii.  Reproductive buds that produce flowers
 D.  Accessory  iv  Additional buds borne at leaf bases

  1. (A) - (ii), (B) - (iii), (C) - (i), (D) - (iv)

  2. (A) - (iii), (B) - (ii), (C) - (i), (D) - (iv)

  3. (A) - (iv), (B) - (iii), (C) - (ii), (D) - (i)

  4. (A) - (i), (B) - (ii), (C) - (iv), (D) - (iii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bud is a condensed rudimentary shoot. Such buds developed into leafy shoots.

  • Axillary buds: originate from the axils of leaves.
  • Vegetative buds: Buds that give rise to new shoots and leaves. Presence of such bud indicates the regrowth of the plant.
  • Floral bud: It is swelling or formation of a premature flower bloom. This bud will eventually produce a flower.
  • Accessory bud:  A bud growing near and in addition to a axillary bud.
  • So, the correct answer is " (A)- (ii),(B)- (iii), (C) - (i), (D) - ( iv).

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Flower is always solitary when:

  1. Shoot bud transforms into flower

  2. Shoot tip transforms into flower

  3. Lateral shoot transforms into flower

  4. Horizontal shoot transform into flower
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option (B) Shoot tip transform into flower.

Shoot tip meristem gets to stop to divide as the shoot cells, and flower formation takes place.
Solitary means a single flower.
When the tip of the shoots is gets transformed into a flower only one single flower will be formed.
Because single tip of shoot have ability to carry only single flower.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Bud associated with the underground stem of potatoes is?

  1. Axillary

  2. Apical

  3. Adventitious

  4. Internodal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The buds found on the eyes of a potato tuber are axillary buds located in the axils of scale leaves. These buds are responsible for the vegetative propagation of the potato plant.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

If there is more than one tunica layer in a stern apex. 

Which among the following is most likely to happen?

  1. All the layers will develop into epidermal cells

  2. Only the outer layer will develop into epidermal cells

  3. All the layers will develop into cortex

  4. Inner layer develops into cortex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Even, if there is more than one tunica layer in the stem apex, only the outer layer will develop into the epidermal cells. The stem has three simple cell types, i.e. the parenchyma, collenchyma and sclerenchyma cells which are responsible for the metabolic functions, repairing and healing wounds and storing starch.

The correct option is B.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

The organization of the shoot apex into tunica and corpus is determined largely on the basis of _______________.

  1. Rate of shoot tip growth

  2. Rate of cell division

  3. Planes of cell division

  4. Regions of meristematic activity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Schmidt has postulated tunica- corpus theory on the basis of studies of shoot apices of angiosperm. This theory is concerned with planes of cell division in the apex. In contrast to apical cell theory, the tunica-corpus theory is applicable only to shoot apex and not to root. There are three types of meristematic tissues like apical (at the tips), intercalary (in the middle) and third as lateral (at the sides).

Schmidt distinguished two tissue zones in the shoot apex and termed as tunica and corpus.

The correct answer is B.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Heaping of earth around base of stem in Potato is meant for.

  1. Preventing exposure of roots

  2. Providing extra support to delicate stem

  3. Inducing development of more auxiliary shoots

  4. Making more water available
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heaping soil around the base of the potato stem, known as earthing up, encourages the development of more underground stems (stolons) from the axillary buds, which then swell to form tubers.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

Assertion (A): Lateral buds close to the shoot apex remain dormant while those some distance below below the apical meristem develop into shoots.

Reason (R): Apical shoot meristems and young leaves are the centres of lAA synthests.

  1. Both A and Rare individually true and R is the correct explanation of A

  2. Both A and Rare individually true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true Assertion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Apical dominance is the phenomenon where the shoot apex inhibits the growth of lateral buds. The apical meristem produces auxins (IAA), which travel down and suppress the development of lateral buds closer to the apex.

Multiple choice biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

The shoot branching depends upon the development of axillary buds, but many of the buds in axillary position never grow out due to the _____________________.

  1. Inhibitory factor present in the axillary bud

  2. Inhibitory factor present in the apical bud

  3. Interaction of factors present in both the axillary & apical bud

  4. Ibhibition under genetic control
Reveal answer Fill a bubble to check yourself
A Correct answer