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Structural Organisation In Plants And Animals

Structural Organisation In Plants And Animals - Biology Questions asked by Filo students

Question 61

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Read the following (A-D) statements :-

It is composed of single layer of tall and slender cells
Their nuclei are located at the base
Free surface may have microvilli
They are found in the walls of Blood vessels and air sac of lungs

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Question 62

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A molecule of ATP bears maximum resemblance to

Palmitic acid
Amino acid
DNA nucleotide
RNA nucleotide

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Structural Organisation in Plants and Animals

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Question 63

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haploid and diploid phase of equal Wiportantance, life cycle beging with haploid phase. e.g Bryrphytes

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Question 64

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herals from the soil. 5.1.2 Modifications of Root Roots in some plants change their shape and structure and become modified to perform functions other than absorption and conduction of water and minerals. They are modified for support, storage of food and respiration (Figure

5.4

5.5

). Tap roots of carrot, turnip and adventitious roots of sweet potato, get swollen and store food. Can you give some more such examples? Have you ever Wrondered what those hanging structures that Bupport a banyan tree are? These are called Prop roots. Similarly, the stems of maize and Gegercane have supporting roots coming out Whe lower nodes of the stem. These are called stit roots, In some plants such as Rhizophora Erowing in swampy areas, many roots come out

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Question 65

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5. 1 THE Root In majority of the dicotyledonous plants, the direct elongation of th leads to the formation of primary root which grows inside It bears lateral roots of several orders that are referred to as se tertiary, etc. roots. The primary roots and its branches cons

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Question 66

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Gynoechm is the female reproductive part of the flower and is made up of one or more carpels. A carpel consists of three parts namely stigma, style and ovary, Ovary is the enlarged basal part, on which lies the elongated tube, the style. The style connects the ovary to the stigma, The stigma is usually at the tip of the style and is the receptive surface for pollen grains. Each ovary bears one or more ovules attached to a flattened, cushion-like placenta. When more than one carpel is present, they may be free (as in lotus and rose) and are called apocarpous. They are termed syncarpous when carpels are fused, as in mustard and tomato. After fertilisation, the ovules develop into seeds and the ovary matures into a fruit. Placentation: The arrangement of ovules within the ovary is known is placentation. The placentation are of different types namely, marginal, axile, parietal, basal, central and free central (Figure 5.16). In marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows, as in pea. When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is taid to be axile, as in china rose, tomato and lemon. In parietal pheentation, the ovules develop on the inner wall of the ovary or on peripheral part, Ovary is one-chambered but it becomes twochambered due to the formation of the false septum, e.g. mustard and Argemone, When the ovules are borne on central axis and septa are absent, as in Dianthus and Primrose the placentation is

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Question 67

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MORPHOLOGY OF FLOWERING PILANTS

5.1.1

Regions of the Root The root is covered at the apex by a thimble-like structure called the root cap (Figure 5.3). It protects the tender apex of the root as it makes its way through the soil. A few millimetres above the root cap is the region of meristematic activity. The cells of this region are very small, thin-walled and with dense protoplasm. They divide repeatedly. The cells proximal to this region undergo rapid elongation and enlargement and are responsible for the growth of the root in length. This region is called the region of elongation. The cells of the elongation zone gradually differentiate and mature. Hence, this zone, proximal to region of elongation, is called the region of maturation. From this region some of the epidermal cells form very fine and delicate, thread-like structures called root hairs. These root hairs absorb water and minerals from the soil.

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Question 68

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Ques - 58 Choose the correct meaning of the idiom in the sentences. These days, companies are jumping on the bandwagon of socially-conscious marketing to push their brands. उत्तर / Answers:

Having an ulterior motive
$O$ Following a trend
O Breaking barriers
1 Not concentrating

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Question 69

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Some cells of shoot apical meristem that are left behind in axil of leaves

Are called axillary bud
Are secondary meristem
Are capable of forming a flower
Form intercalary meristem

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Question 70

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Which of the following structures permit the exchange of gases between the inner tissues and outer atmosphere in woody stems?

{Cork,Lenticels,Heartwood,"Cuticularised cell walls"}

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Question 71

Views: 5,832

(NEET 2019) 36. Which of the following bacteria reduce nitrate in soil into nitrogen?

Nitrobacter
Nitrococcus
Thiobacillus
Nitrosomonas

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Question 72

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(NEET 2013) processes are ses are 39. Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas

(N_{2})

to the atmosphere?

Aerobic nitrate oxidation and nitrite reduction
Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
Anaerobic a ammonium oxidation and (Karnataka NEET 2013)

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Question 73

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Outer side of epidermis is not covered with cuticle in

{Stem,Roots,Fruits,Leaves}

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Question 74

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It acts as a communication junctions i.e when cell recives a signal to contract, its neighbour are also stimulated to contract.

Smooth muscle
Cardiac muscles
Skeletal musle
Voluntry muscles

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Question 75

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Which of the following not a function of epithelium?

Protection
Connection
Secretion or excretion (4) Absorption

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Question 76

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I can remember anything books and walking sticks.

about
for
with
except

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Structural Organisation in Plants and Animals

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Question 77

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DNA is not found in :-

Nucleus
Mitochondria
Chloroplast
Ribosome

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Structural Organisation in Plants and Animals

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Question 78

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Mitochondria and chloroplast are considered to be endosymbionts of cell because they :-

Possess their own nucleic acid
Have capacity of ATP synthesis
Do not reproduce
All the above

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Structural Organisation in Plants and Animals

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Question 79

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Polysome is a chain of :-

Pinesomes
Phagosomes
Microsomes
Ribosomes

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Question 80

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Which of following is not common in chloroplasts \& mitochondria?

Both are present in animal cells
Both contain their own genetic material
Both are present in eukaryotic cells $/$
Both are present in plant cells $X$

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