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Value of (1/2)(1-1/3).......(1-1/n-1)(1-1/n)

Name the various tools of tracing evolutionary relationships which have been used for studying human evolution.

Corpora striata occur in

Which crop is associated with a disease called ‘red rot’?

What is the role of thyroxine in the body?

One important function of the Fluorescent Screen is

Diversification of plant life appeared due to:

Which of the following connects placenta to embryo?

In meiosis, at the start of _____ the sister chromatids separate and the daughter chromosomes move up to the poles of the spindle.

Are the following statements true or false ? Give reason in support of your answer.

(a) The rate of photosynthesis continues to rise as long as the intensity of light rises.

(b) The outside atmospheric temperature has no effect on the rate of photosynthesis.

(c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine.

(d) Destarching of the leaves of a potted plant can occur only at night.

(e) The starting point of carbon cycle is the release of $C{O}_2$ by animals during respiration.

(f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur.

(g) Photosynthesis is considered as a process supporting all life on earth.

A cow is dependent on plants for its food. It is showing:

Regarding assertion and reason, which is the correct option
Assertion [A]: A breeder can dig into a germplasm to manipulate different combination of alleles in order to begin the process of creating a superior plant.
Reason [R]: The main objective of germplasm collection is preservation of genetic diversity of a particular plant or genetic stock for its use in future.

Which of these statements are true when considering the formation of a scar?

Explain the mechanism of closing and opening of the stomata.

People living in the low Himalayan hilly regions often suffer from goitre. What could be the possible reason for it ?

Perisperm differs from endosperm in:

An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow :

(a) Name the process being studied.

(b) Explain the process named above in (a) .

(c) Why was the pot covered with a plastic sheet ?

(d) Suggest a suitable control for this experiment.

(e) Mention two ways in which this process is beneficial to plants.

(f) List three adaptations in plants to reduce the above mentioned process.

Which one among the following is not true?

The ___________ receives, processes, interprets and stores information coming from senses and sends out the messages destined for the effector.

Which of the following statement shows that common cold is different from pneumonia?

Q32. With reference to 3-Parent technique, consider the following statements?

1. A 3-parent baby contain DNA from three persons. (2 male and 1 female).

2. The techniques involves in invitro fertilization of mother’s egg and donor’s egg with the father egg.

3. Norway became the first country to approve 3-parent technique.

Which of the above statement(s) is/are correct?

Multicellular organisms cannot meet oxygen requirement only by diffusion . give reason.

Which of the following is the correct order of stages in human embryonic development?

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Explain your answer?

Acquired traits are traits gained by an individual as a result of his interaction with the environment. These traits do not change the genetic make-up of an organism and hence are not carried down by heredity. Any random error in gene, that occurs while replication is known as________________________.

Give various source which are adding green house gases to the environment

A woman is suffering from high blood pressure. When observed by the doctor it comes out to be:

A zygote which has inherited an X chromosome from the father will develop into :

(a) baby boy (b) baby girl (c) adult (d) either boy or girl

After observing the prepared slides of binary fission in amoeba and budding in yeast following observations were reported:

(a) Single cells of amoeba and yeast were undergoing binary fission and budding respectively.

(b) Cytokinesis was observed in the yeast cell.

(c) Elongated nucleus was dividing to form two daughter nuclei in amoeba.

(d) A chain of buds were observed due to reproduction in amoeba.

The correct observation(s) is / are:

For reaching the left side of the heart, blood must pass through_______.

Match the following:
$\begin{array}{cccc}& \text{A}& & \text{B}\\ \text{1.}& \text{Androecium}& \text{a}& \text{Whorl of sepals}\\ \text{2.}& \text{Gynoecium}& \text{b}& \text{Whorl of petals}\\ \text{3.}& \text{Corolla}& \text{c}& \text{Whorl of stamens}\\ \text{4.}& \text{Calyx}& \text{d}& \text{Whorl of pistil/carpel}\end{array}$

Haploid cell contains a set of …………… chromosomes like human cell.

Which pathway for aerobic cellular respiration is located in the cytoplasm of the cell?

Female anopheles mosquitoes spread __ by biting.

Assertion [A]: Glucagon lowers the blood sugar level.

Reason [R]: Glucagon increases the cellular uptake of glucose.

Pollen grains are produced in__________.

Glomerular filtration is possible because-

Human insulin is produced in large scale by inserting the gene responsible for the production of insulin from humans into the genome of a ___.

The outgrowth of hydra is termed as__________.

The human species has genetic roots in :
(a) America
(b) Africa
(c) Australia
(d) Antarctica

Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?

The problems such as flood, soil erosion, extinction of wild species and global warming can be reduced to an extent by_____

Archaeopteryx shows features of

Question 67
Why do veins have thin walls as compared to arteries?

Which of the following events marks the second stage of labour?

Question 48
Fill in the blanks
(a) ___ are forms of complex tissue.
(b) ___ have guard cells.
(c) Cells of cork contain a chemical called ___.
(d) Husk of coconut is made of ___ tissue.
(e) ___ gives flexibility in plants.
(f) ___ and ___ are both conducting tissues.
(g) Xylem transports ___ and ___ from soil.
(h) Phloem transport ___ from ___ to other parts of the plant.

The average systolic blood pressure is ______ mm Hg.