0

Biology (Mixed Test)

Attempted 0/25 Correct 0 Score 0

The role of the nucleus in regulating the phenotype of plant was discovered in

  1. maize

  2. Neurospora

  3. Acetabularia

  4. pea


Correct Option: C
Explanation:

The control of nuclei over the phenotypic expression of the cell was studied in Acetabularia.

Which of the following types of tendrils is present in pea plant?

  1. Leaflet tendril

  2. Stipular tendril

  3. Leaf tip tendril

  4. Petiolar tendril


Correct Option: A
Explanation:

In this, the upper leaflet gets modified into tendril for support.

Which of the following cell organelles is/are semi-autonomous?

  1. Mitochondria

  2. Ribosomes

  3. Endoplasmic reticulum

  4. Golgi bodies


Correct Option: A
Explanation:

They are semi-autonomous.

What is the photosynthetic unit of chloroplast called?

  1. Quantosomes

  2. Oxysomes

  3. Mesosomes

  4. Spherosomes


Correct Option: A
Explanation:

These are the light energy trapping systems of the pigment present in the chloroplast

The shape of the chromosome is determined by

  1. centromere

  2. telomere

  3. centrosphere

  4. chromomere


Correct Option: A
Explanation:

It is the structure in the chromosome which gives it shapes like I, V, L, etc.

Which of the following types of linkages is responsible for maintaining the primary structure of proteins?

  1. Hydrogen linkage

  2. Peptide linkage

  3. Glucosidic linkage

  4. Ester linkage


Correct Option: B
Explanation:

Primary structure has only linear chain of amino acids.

Which of the following pairs of amino acids plays an imporatant role in growth and are not taken in by adults?

  1. Cyctine and cystein

  2. Tryptophan and valine

  3. Leucine and isoleucine

  4. Arginine and histidine


Correct Option: D
Explanation:

These are the amino acids which are mainly associated with growth in the young children and are not necessarily taken up by the adults.

If the leaves of a plant loose turgidity in the noon and recover in the evening, which phenomena must it have undergone?

  1. Temporary wilting

  2. Incipient wilting

  3. Permanent wilting

  4. Midday dessication


Correct Option: A
Explanation:

plant recovers to normal state after temporary wilting when it absorbs enough water

What will happen to an animal cell placed in water?

  1. It will swell and burst

  2. It will shrink and die

  3. It will shrink and plasmolyse

  4. It will swell and become turgid


Correct Option: A
Explanation:

water will move into the cell and as the animals cell does not have cell wall , it will burst

Which of the following is a nutritionally essential amino acid?

  1. Aspartic acid

  2. Glycine

  3. Phenylalanine

  4. Serine


Correct Option: C
Explanation:

It is essential in all the conditions.

When is the leaf insertion said to be ramal?

  1. When the leaves are present on the nodes of the branches

  2. When the leaves are present directly on the nodes of the main stem

  3. When the leaves are present on the apical position on the stem

  4. When the leaves are present on the reduced discoid stem


Correct Option: A
Explanation:

Ramal is a sencondary position insertion, leaves are borne on branches

In which of the following plants is a decompound type of leaf present?

  1. Carrot

  2. Citrus

  3. Oxalis

  4. Acacia


Correct Option: A
Explanation:

In this type of plants, the lamina is more than thrice pinnate.

What should be the concentration of soil content for the proper growth of plants?

  1. Hypotonic in relation to cells

  2. Hypertonic in relation to cells

  3. Isotonic in relation to cells

  4. Ultratonic in relation to cells


Correct Option: A
Explanation:

cells place in hypertonic solution can take in water.

Multicostate reticulate convergent venation is present in

  1. smilax

  2. peepal

  3. banana

  4. bamboo


Correct Option: A
Explanation:

There is no distinct midrib and the veins appear to form a network.

In which of the following plants, are leaves persistently present?

  1. Nerium

  2. Mulberry

  3. Dalbergia

  4. Euphorbia


Correct Option: A
Explanation:

in this type the leaves do not fall off simultaneously and thus the plant looks ever green

In which of the following conditions it is said that certain types of lipids and proteins are essential?

  1. When a cell cannot synthesize them and dies in their absence.

  2. When cell needs them badly, and synthesizes them on its own.

  3. When cell needs them and obtains them from the diet.

  4. When cell needs them and obtains them from adjacent cells.


Correct Option: C
Explanation:

  These are not synthesized in the cell so, the cell has to obtain them from the food.

What type of margin is seen in the rose leaf?

  1. Serrate

  2. Entire

  3. Dentate

  4. Crenate


Correct Option: A
Explanation:

The margin is having the tooth like that of a saw

A waxy material, deposited on the walls of cork cells, prevents the loss of water. What is this water proof substance called?

  1. Pectin

  2. Chitin

  3. Hemicellulose

  4. Suberin


Correct Option: D
Explanation:

It is the deposition in the cork cells of higher plants that maes in water proff

Which of the following characteristics of insulin makes it usable for assessing glomerular filtration rate?

  1. It is a polysaccharide.

  2. It has high molecular weight.

  3. It has high molecular weight and is insoluble in human tissues.

  4. It has low molecular weight and is unutilized in human tissues.


Correct Option: D
Explanation:

As it has low molecular weight, it is easily excreted and being unutilized, it is passed out as such and can be assessed then.

To which of the following categories collagen belongs?

  1. Chromoproteins

  2. Fibrous proteins

  3. Conjugated proteins

  4. Nucleoproteins


Correct Option: B
Explanation:

Collagen has a fibrous structure.

How does the structure of sunken stomata of xerophytes differs from other plants?

  1. Guard cells are situated below epidermis

  2. Guard cells are in the line with epidermis

  3. Guard cells are situated above epidermis

  4. Guard cells are limited only to lower epidermis


Correct Option: A
Explanation:

they are present below the level of epidermis thus called sunken.

How does the phyllode differ from phylloclade?

  1. It does not bear auxilliary buds

  2. IIt does not have structures like bristles, scle leaves, etc

  3. It is always in horizontal orientation

  4. It is a modified stem with leaf-like appearance


Correct Option: B
Explanation:

these structures are present in phyllocalde and are absent in phyllode

In which of the following plants can the leaves store water as an adaptive measure?

  1. Agave

  2. Berberis

  3. Onion

  4. Eichhornia


Correct Option: A
Explanation:

it stores plant to resist the drought conditions

In which of the following plants is a sagittate type of lamina present?

  1. Colocasia

  2. Eucalyptus

  3. Sonchus

  4. Tinospora


Correct Option: A
Explanation:

the lamina is in the shape of an arrow

What happens to enzymes at low temperature?

  1. They get inactivated.

  2. They get over activated.

  3. They remain unaffected.

  4. They get denatured.


Correct Option: A
Explanation:

Enzymes have a particular optimum range of working temperature, below which their activity decreases.

- Hide questions