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Previous year question Of Plants Physiology and Reproduction For NDA

Previous year question Of Plants Physiology and Reproduction

Previous year question
Q 2366191975

Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant appears to be bent towards light?
NDA Paper 2 2013
(A)

Cytokinin

(B)

Auxin

(C)

Gibberellin

(D)

Abscissic acid

Solution:

Chalcedony and went gave on explanation of phototropic and geotropic curvature and effect of auxin. Auxins are plant hormones that regulate growth and intlence various processes like apical dominance (phototropism and geotropism, control of abscission), weed control, root differentiation on stem wiling, parthenocaupy, control of cadging, Hower initiation in pineapple, differentiation of xylem and phloem and sex expression.
Correct Answer is `=>` (B) Auxin
Q 2306191978

Which of the following statements about sexual reproduction in flowering plants are correct?
l. Stamen is present in the centre of a flower.
2. Stamen produces pollen grains.
3. The swollen bottom part of carpel is the ovary.
4. The fusion of germ cells gives rise to zygote.

Select the correct answer using the codes given below


NDA Paper 2 2013
(A)

2, 3 and 4

(B)

2 and 4

(C)

1 and 3

(D)

All of these

Solution:

Flowering plants are the dominant plant form on land and reproduce by sexual as well as asexual means. Their reproductive organ is flowers. The anther produces pollen grains get attached stigma of female reproductive structure (carpel) where female gometophyte ovules are coated inside the ovary. Both the gometophyte tune to from zygote by double fertilization which develops into tripod endosperm and over develops into fruit.
Correct Answer is `=>` (A) 2, 3 and 4
Q 2337801782

The main function of the inner bark of a woody plant is to.
NDA Paper 2 2011
(A)

Transport minerals and water from the roots to the leaves

(B)

Act as a membrane impermeable to water and gas

(C)

Transport food from the leaves to the other parts of the plant

(D)

Protect the plant from herbivorous animals

Solution:

All the dead cells lying outside the phellogen (cork, cambium) constitute the outer bark of plant. It may include the epidermis, cork, hypodermics and even part of a cortex. Bark is protective in nature and act as a membrane permeable to water and gas. The pericycle, primary and secondary phloem are included in inner bark, i.e., transport food from leaves to other parts.
Correct Answer is `=>` (C) Transport food from the leaves to the other parts of the plant
Q 2347001883

Which one among the following Indian scientists proposed a theory for long distance transport of water in plants?
NDA Paper 2 2011
(A)

J C Bose

(B)

Birbal Sahni

(C)

P Maheshwari

(D)

N S Parihar

Solution:

Sir J C Bose (1923) put forward pulsation theory about the ascent of sap (long distance transport of water). The theory believes that innermost cortical cells of the roots absorb water from the outer side and pump the same into xylem channel.
Correct Answer is `=>` (A) J C Bose
Q 2337101982

The question consist: of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below.
NDA Paper 2 2010
Solution:

In photosynthesis, the green plants in the presence of chlorophyll use light, carbon dioxide and water and release oxygen. Carbon dioxide is reduced into energy rich organic compound and water is oxidised into oxygen.

`6CO_2+12 H_2O underset(text(chlorophyll)) overset(text(light))-> C_6H_12O_6+6H_2O+6O_2 uparrow`
Correct Answer is `=>` (C)
Q 2347101983

The question consist: of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below.
NDA Paper 2 2010
Solution:

Reproduction is defined as a biological process in which an organism gives rise to young ones (offspring) similar to itself. When offspring is produced by a single parent with or without the involve of gamete formation, the reproduction is asexual. When two parents participate in the reproductive process and also involve fusion of male and female gametes. It is called sexual reproduction.
Correct Answer is `=>` (C)
Q 2327312281

Which one among the following produces seeds but not flowers?
NDA Paper 2 2010
(A)

Cashew nut

(B)

Coffee

(C)

Groundnut

(D)

Pine

Solution:

Pine is a naked seeded plant, i.e., ovules or seeds are not enclosed inside ovary or fruit wall. They produce meiospores and megaspores which are produced in microsporangia and megasporangia borne on the sporophylls respectively. The sporophylls are arranged spirally on axis to form male and female cones.
Correct Answer is `=>` (D) Pine
Q 2337312282

Which among the following is not a true fruit?
NDA Paper 2 2010
(A)

Apple

(B)

Date

(C)

Grape

(D)

Plum

Solution:

False fruit is a fruit that incorporates, in addition to the ovary wall, other parts of the flower, such as the receptacle, e.g., apple, strawberry, cashew, etc.
Correct Answer is `=>` (A) Apple
Q 2347312283

Which of the following plants is referred to as a living fossil?
NDA Paper 2 2009
(A)

Ephedra

(B)

Cycas

(C)

Ginkgo

(D)

Adtantum

Solution:

Ginkgo biloba is a living fossil because its ancestors are unchanged for the last many hundred years while its relatives disappeared (extinct). Cycas is also considered as a living fossil.
Correct Answer is `=>` (C) Ginkgo
Q 2367312285

Softening of mature ripe fruits is due to
NDA Paper 2 2009
(A)

Dissolution of middle lamella

(B)

Degradation of primary wall

(C)

Delignification

(D)

Removal of suberin deposits in the cell wall

Solution:

During fruit maturation and ripening, ethylene
production becomes stimulated which in turn hastens fruit
ripening. Complex carbohydrates are broken down into simple
sugars, chlorophylls are broken down and cell wall become soft
due to dissolution of middle lamella (ca-pectate) which acts as
cementing layer between two cells and provides rigidity.
Correct Answer is `=>` (A) Dissolution of middle lamella
Q 2327712681

Which of the following organelles of a cell is/are involved in photosynthesis?
NDA Paper 2 2009
(A)

Chloroplast

(B)

Mitochondria

(C)

Endoplasmic reticulum

(D)

Golgi bodies

Solution:

Chloroplasts are green plastids, which function as the site of photosynthesis in eukaryotic photoautotrophs.
Correct Answer is `=>` (A) Chloroplast
Q 2317123089

Consider the following statements In fern plants,
l. vascular system is absent.
2. reproductive organs are multi-cellular.
Which of the statements given above is/are correct?
NDA Paper 2 2008
(A)

Only 1

(B)

Only 2

(C)

Both 1 and 2

(D)

Neither 1 nor 2

Solution:

In fern plants reproductive organs are multi-cellular The gametophyticplant bears male reproductive structure called antheridia and female reproductive structure called archegonia. In fern vascular system is well developed and it is differentiated into xylem and pholem.
Correct Answer is `=>` (B) Only 2
Q 2327223181

Consider the following plants.
1. Jasmine
2. Sugarcane
3. Turmeric
Which of the above is/are propagated by vegetatiive method?
NDA Paper 2 2008
(A)

Only 1

(B)

1 and 2

(C)

·2 and 3

(D)

All of these

Solution:

Vegetative propagation is the formation of a new individual from any vegetative part of the parent body, sugarcane and turmeric are propagated by vegetative method.
Correct Answer is `=>` (C) ·2 and 3
 
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