Structure of living organisms - class-IX
Description: structure of living organisms | |
Number of Questions: 56 | |
Created by: Vijay Puri | |
Tags: life processes: reproduction, growth and development reproduction - the generating system cell division tissues: plant and animal tissues structure of living organisms structure of chromosome, cell cycle and cell division biology division for growth and reproduction cell cycle and cell division cell and cell organelles |
Which of the following organs contain(s) smooth muscles?
Which of the following tissues is made up of long contractile cells packed with actin and myosin microfilaments?
Myology is the study of
Heart muscles are ____________.
Striated and voluntary muscles occur in ____________.
Mast cells occur in ______________.
Which of the following cells are found in areolar tissue?
Different types of cells are given below.
Tonsils in the pharynx are made up of
Which type of tissue forms glands
Pseudo stratified epithelium is present in
Which of the following statement is $NOT$ $CORRECT$ about the compound epithelium?
I. It consist of several layers
II. It covers the dry surface of the skin, the moist surface of buccal cavity, inner lining of ducts of salivary glands and pancreatic ducts
III. It provides protection against chemical and mechanical stresses
IV. Being multilayered it has a great role in secretion and absorption
Our outer layer of skin is an example of which type of tissue?
The epithelial tissue present on the inner surface of bronchi oles and fallopian tubes is :
(i) Each fasciculus (or bundle of muscle fibres) is surrounded by an epithelial tissue covering called perimysium
(ii) Multi unit smooth muscles are present in ciliary and iris muscles in the eyes and muscles of the walls of large blood vessels.
(iii) Columnar epithelium present in gastric glands, intestinal glands and pancreatic lobules, has a secretory role and is called as glandular epithelium.
(iv) Epithelial tissue arises only from the ectoderm of embryo and is usually supplied with blood vessels
Cell cycle was divided into four stages i.e. G$ _1$, S, G$ _2$, M by
Which of the following stage of M-phase is considered as tetraploid stage?
A cell divides in order to?
Chromosome decondensation, crossing over synapsis formation, nucleolus disappear, chromosome separation, astral ray formation, centriole duplication. How many of these are observed in prophase of meiosis-1 and mitosis both?
The life of all multicellular organisms through sexual reproduction starts as a ............
What would be the DNA content of the cell at G1, G2, anaphase stage, when the content after the mitotic phase is 40pg
The most dramatic period of the cell cycle is
identify correct order of Eukaryotic cell...
Cell wall thickning and protoplasmic modification during growth of plants occur in ________________.
The stage of cell cycle when cell does not undergo differentiation is
During cell cycle, RNA and protein synthesis takes place during which of the following phase?
The sequence of cell cycle is
The various phases of the cell cycle will be affected by limiting growth factors like
Generation time represents period of
The correct order of the various phases of eukaryotic cell cycle is ____________.
Identify, the correct sequence of the cell cycle events.
I. Nuclear membrane dissolves
II. Cell size increases
III. Two daughter cells form
IV. DNA replicates
Mitotic cell cycle is divided typically into four phases, $G _1$, S, $G _2$ and M. Considering a mitotic cycle time of $18$ hours, the distribution of period of time(in hours) for each of these phase will be. $G _1$S$ _2$M.
Yeast complete cell cycle in _____________.
Cell cycle was discovered by
In a culture of E.coli the cell population increased from $1.5 \times 10^6$ cells /ml to $ 12 \times 10^6$ cells/ml in 36 minute.The generation time is
Cdk which control progression through cell cycle check points are fully activated by.
Which cellular organelles are involved in initration of intrinsic pathway of apoptosis?
Which represents the correct sequence of stages in the cell cycle?
Of the total duration of cell cycle, the interphase lasts more than.
The cell is not allowed to past the cell cycle restriction point, DNA damage is detected. Which of the following proteins are involved in detection of DNA damage and inhibition of cycle at the restriction point?
In order to enter cell cycle a cell must be stimulated from outside. What type of molecule provides this stimulation?
Select the correct option:
Select the correct option:
Select the correct option:
Select the correct option:
(i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases.
(ii) In the 24 hours average duration of cell cycle of a human cell, cell division proper lasts for only about an hour.
(iii) M phase constitutes more than 95% of the duration of cell cycle.
How many following statements are correct?
(A) Nucleus as a cell organelle was first described by Robert Brown as early as 1651.
(B) The interphase nucleus has highly condensed nucleoprotein fibres called chromatin.
(C) During different stages of cell division, cells show structured chromatin in place of the nucleus.
(D) Every chromosome essentially has a primary constriction which is also known as NOR.
(E) Many membrane-bound minute vesicles called microbodies that contain various enzymes are present in both plant and animal cells.
Which of the following is the most direct cuse of polyteny in somatic cells of certain organisms?
Which one of the following events is incorrect for cell cycle?
The most dramatic period of the cell cycle is?
Intermitosis is
How many chromosomes will the cell have at GI, after S and after M-phase respectively if it has 14 chromosomes at interphase
Match the lists and choose the correct option:
a. | $G _1$ phase | i. | Replication of DNA |
---|---|---|---|
b. | S-phase | ii. | Quiescent stage |
c. | $G _2$-phase | iii. | Condensation chromatin |
d. | $G _0$-phase | iv. | Protein synthesis |
v. | Interval between mitosis and initiate of DNA replication |