Biology Flashcards
What is active transportation?
Active transport is the movement of molecules across a membrane, from a region of their lower concentration to a region of their higher concentration, i.e. aganist the diffusion or concentration gradient.
Chlorophyll in photosynthetic prokaryotic bacteria is associated with
membranous vesicles
Which of the following organisms is responsible for sleeping- sickness?
Trypanosoma
What are smooth muscles?
Smooth muscles are involuntary muscles as their functioning cannot be directly controlled by our own will.
Which one of the following cell organelles is known as ‘suicidal bags’ of a cell?
Lysosomes
Which one of the following is the correct sequential phase in the successional development of vegetation community in a habitat?
Nudation, migration, reaction and stabilisation
Which one of the following acids is also known as vitamin-C?
Ascorbic acid
Which one of the following is not
found in animal cells?
Cell wall
Which one of the following functions is not carried out by smooth endoplasmic reticulum?
Synthesis of protein
Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?
Lysosomes
Which one of the following tissues is responsible for increase of girth in the stem of a plant?
Lateral meristem
Haemoglobin of RBC can carry
both _______
oxygen and carbon dioxide
Urea is produced in ____
liver
Which of the following is/are the main absorbing organ/organs of plants?
Roots
In which one of the following physiological processes, excess water escapes in the form of droplets from a plant?
Guttation
If the xylem of a plant is mechanically blocked, which of the following functions of the plant will be affected?
Transport of water and solutes
Which one of the following is the special type of milk produced by a lactating mother, essential for the development of immune response of newborn baby in human?
Colostrum
Which one of the following statements explains higher mutation rate and faster evolution found in RNA virus?
RNA is relatively unstable compared
to DNA
_______ is a process of progressive accumulation of heavy metals and pesticides in an organism.
Bioaccumulation
Large fishes of the pond are found to have higher concentration of pesticides than planktons of the same pond. (True or false)
True
A person may suffer from tuberculosis if she/he frequently visits crowded place.
Bacteria of tuberculosis spread through droplets by sneezing or coughing.
Which one of the following is a true fish as per the biological system of classification?
Flying fish
In which one of the following types of connective tissue in animals does fat get stored?
Adipocyte
Lysosome is formed from which
of the following cell organelles?
Golgi bodies
A protein is synthesised in the endoplasmic reticulum bound ribosomes and it targets to the inner thylakoid space of chloroplast. How many double-layered membrane layers it has to pass to reach its destination?
4
What is lymph?
lymph is a colourless fluid containing specialised lymphocytes, not RBCs. It circulates throughout the lymphatic system. Lymph is also an important carrier for nutrients, hormones, etc.
All amphibians and few reptiles have _____-chambered heart.
Three
Which one of the following elements is involved in the control of water content of the blood?
Potassium
Which one of the following elements is essential for the formation of chlorophyll in green plants?
Magnesium
Which one of the following proteins gives lustrous shiny appearance to silk fibre?
Fibrin
Blue baby syndrome is caused by
the contamination of
Nitrite (NO2−)
A biological community in its environment such as a pond, an ocean, a forest, even an aquarium is known as
biome
The foul smell of urine of a healthy man having healthy food, when spilled on floor, is mainly due to the bacterial decomposition of
Urea
Which one of the following gases is released mostly from landfills in urban areas?
Methane
Which one of the following is considered as ‘good cholesterol’ with reference to individuals facing the risk of cardio-vascular diseases and hypertension?
High Density Lipoprotein (HDL)
Dengue virus is known to cause low platelet count in blood of patient by
accumulating platelets in
intestine.
