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When are the sound "LUB" and "DUB" produced respectively during heart beat?

The three membranes around the brain are:

i. Arachnoid

ii. Pia mater

iii. Dura mater

Which is the correct order in which these membranes are present (from outermost to innermost)?

Consider a colour blind woman who has married a normal man (without colour blindness). They have one son and one daughter. Which of the following statements about their children is/are true?

Which of the following organelles are distributed between daughter cells during cytokinesis?

In which method a branch of parent plant is buried in the soil?

The part of brain which is present on the top portion of medulla is called___

Most of the neurons of our body are ___

Stimulus for insulin secretion is_______________________.

Question 9 (ii)
Which part of the digestive canal is involved in:
(ii) chewing of food __.

Which of the following processes come into existence when variations are associated with geographical isolation?

(a) Name the red pigment which carries oxygen in the blood.
(b) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
(c) How many chambers are there in the heart of (i) an amphibian, (ii) a mammal, and (ii;) a fish?
(d) Describe the circulatory system in a fish.

A red color pigment in RBCs help in transportation of gases. It shows more affinity to:

New plants can be produces without the help of any reproductive organ by:

State whether the following statement is true or false :
Spores produced by the bread mold plant are actually its seeds.

Name the method in which a branch of parent plant is buried in the soil?

The factors responsible for the rapid spreading of bread mould on slices of bread are :
(i) Presence of a large number of spores in the air.
(ii) Presence of a large number of thread-like branched hyphae.
(iii) Presence of moisture and nutrients.
(iv) Formation of round shaped sporangia.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?

What is life who made life

Fishes have__chambered heart.

The hormone which regulates the amount of glucose in the blood by converting excess of glucose into glycogen is _____. The hormone which regulates glucose in the blood by converting glycogen back to glucose whenever required is ____.

Why do camels have thick bushy eyebrows?

In aerobic cellular respiration, which generates more ATP, substrate-level phosphorylation or chemiosmosis?

Chloroplasts are called energy converters. Explain

State the position and function of pyloric sphincter

If the concentration of solution inside the cell and outside the cell is same, the movement of water molecules will be in which direction?

Select the correct structure of the sentence.
N = noun phrase; V = verb phrase; Adj = adjective phrase; p = prepositional phrase
The guard took out his baton.

During contraction of the uterine muscles, the correct position of the child is

Briefly discuss Lamarckian Theory of Inheritance, citing an appropriate example.

1.Name the tissue which transports soluble products of photosynthesis in a plant.

Match List I with List II and select the correct answer.

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(a) What is meant by vegetative propagation?
(b) Vegetative propagation involves the growth and development of 'something' present in the old part of the plant to form a new plant. What is this 'something'?
(c) Why do green grass plants spring up in dry fields on their own after the rains?

Biological term for the sperm duct

Enter 2 words only.

During the deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic add in :
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) golgi body

If the ratio of each phenotype of the seeds of pea plants in the $F_2$ generation is 9 : 3 : 3 : 1, it is known as :

(a) tetrahybrid (b) monohybrid ratio (c) dihybrid ratio (d) trihybrid ratio

O₃, CO₂ and water vapour stop the heat radiated out from the atmosphere. This phenomenon is called

A swollen leaf base is called

Which nitrogenous base pairs up with Thymine?

Name any two non-renewable resources?

How does the membrane potential inside a neuron change during an action potential?

What is pharynx